VENTILATION DEVICE FOR A BUILDING AND METHOD FOR OPERATING A VENTILATION DEVICE

Description

[0001] The invention relates to a ventilation device for a building in which a fan and an actuator are arranged, wherein, in a first setting of the actuator, a first housing opening is connected to a fan inlet of the fan and a second housing opening to a fan outlet of the fan, and in a second setting of the actuator, the first housing opening is connected to the fan outlet of the fan and the second housing opening to the fan inlet of the fan. It also relates to a method for operating a ventilation device.

[0002] For example, the prior art document DE 20 2010 008 657 U1 describes a fan unit comprising a housing with a flow channel, a fan wheel located within the housing in the flow channel, an electric motor driving the fan wheel, a first inlet / outlet section, and a second inlet / outlet section. It is provided that a switching flap, namely a first flap in the first inlet / outlet section and a second flap in the second inlet / outlet section, is pivotably arranged in both the first and second inlet / outlet sections about a rotational axis of 90° at the level of and around the dividing plane of the flow channel.

[0003] The object of the invention is to propose a ventilation device for a building which has advantages over known ventilation devices, in particular a compact design and enables rapid switching between the first setting and the second setting and vice versa.

[0004] This is achieved according to the invention with a ventilation device for a building having the features of claim 1. It is provided that the actuating device has a first housing opening connection fluidly connected to the first housing opening, a second housing opening connection fluidly connected to the second housing opening, a fan inlet connection fluidly connected to the fan inlet, and a fan outlet connection fluidly connected to the fan outlet, wherein a) in the first setting, an actuating element of the actuating device is arranged in a first position in which, within the actuating device, it fluidly connects the first housing opening connection and the fan inlet connection and fluidly separates them from the second housing opening connection and the fan outlet connection, and fluidly connects the second housing opening connection and the fan outlet connection and fluidly separates them from the first housing opening connection and the fan inlet connection, and b) in the second setting, the actuating element of the actuating device is arranged in a second position,in which, within the actuating device, it firstly connects the second housing opening connection and the fan inlet connection fluidly and separates them fluidly from the first housing opening connection and the fan outlet connection, and secondly, it connects the first housing opening connection and the fan outlet connection fluidly and separates them fluidly from the second housing opening connection and the fan inlet connection, wherein the actuating device (3) has an actuating device housing in which an actuating counter element (30) with four edge-closed openings (31, 32, 33, 34) is arranged, wherein the actuating element (14) in the first position fluidly opens two of the first openings (31, 32, 33, 34) and in the second position fluidly opens two of the second openings (31, 32, 33, 34) and closes the other openings (31, 32, 33, 34).

[0005] Advantageous embodiments with expedient further developments of the invention are specified in the dependent claims. It should be noted that the exemplary embodiments described in the description are not limiting; rather, any variations of the features disclosed in the description, the claims, and the figures are possible.

[0006] The ventilation system serves to ventilate a building, i.e., to extract air and / or supply it with fresh air. The ventilation system can be an integral part of the building, but preferably it is separate from it. During extraction, the ventilation system moves air from a first area towards a second area, and / or during supply air, it moves air from the second area towards the first area. The first area is, for example, a room, particularly an interior space, within the building; the second area is another room or—preferably—an exterior environment. The ventilation system is designed and configured to alternate between extraction and supply air. This means that the ventilation system alternately extracts air from the first area or room and supplies it with fresh air.

[0007] The ventilation device includes a fan located within its housing. The fan is preferably operated with a constant airflow direction, meaning it always moves air in the same direction during operation. The housing is made, for example, of sheet metal or plastic, particularly expanded polypropylene (EPP). In addition to the fan, the housing also contains an actuating device. This device controls the airflow direction through the ventilation device, determining whether the air is drawn out of or into the first area. For this purpose, the actuating device connects the first housing opening to the fan inlet and the second housing opening to the fan outlet.In a second configuration, however, it connects the first housing opening to the fan outlet and the second housing opening to the fan inlet. The first housing opening is preferably located on the inside and the second housing opening on the outside of the ventilation device; the first housing opening is thus located on the side of the first area and the second housing opening on the side of the second area.

[0008] Conversely, this means that the first housing opening is only connected to the second area via the ventilation system, while the second housing opening is only connected to the first area via the ventilation system. With the fan operating in the same direction, the first setting of the actuator directs air from the direction of the first housing opening towards the second, and the second setting directs air from the direction of the second towards the first. Both the first and second housing openings thus serve as inlet and outlet openings, respectively. This allows for flexible operation of the ventilation system while maintaining a constant fan direction.By keeping the conveying direction constant, noises that could arise from reversing the direction of rotation of the fan to change the conveying direction are effectively avoided.

[0009] To make the described ventilation device particularly compact and to achieve rapid switching of the flow direction through the ventilation device, the actuator has an actuating element, preferably exactly one actuating element, by means of which the flow direction is adjusted. In the first setting, the actuating element is in the first position, and in the second setting, it is in a second position, which differs from the first position. Preferably, the position is understood to be an angular position. Accordingly, the actuating element is rotatably mounted about an axis of rotation of the actuating element, namely in the housing. The actuating element consists, for example, of plastic and / or a sheet metal.

[0010] The actuator is designed such that, in its first position, the actuator element fluidically connects the first housing opening connection and the fan inlet connection, and the second housing opening connection and the fan outlet connection. Conversely, the fluid flow between the first housing connection and the fan inlet connection on the one hand, and the second housing opening connection and the fan outlet connection on the other, is interrupted. This occurs within the actuator itself, so that, of course, the various connections of the actuator can remain fluidically connected to each other outside the actuator, not least via the first and second housing openings, preferably exclusively via these.Within the actuator, only the first housing opening connection and the fan inlet connection are connected to each other, and the second housing opening connection and the fan outlet connection are connected separately. In the first position of the actuator, the airflow path through the housing of the ventilation unit, in the direction of airflow, is as follows: first housing opening, first housing opening connection, fan inlet connection, fan inlet, fan outlet, fan outlet connection, second housing opening connection, and second housing opening.

[0011] In the second position, the actuator connects, on the one hand, the second housing opening port and the fan inlet port, and on the other hand, the first housing opening port and the fan outlet port. However, the flow connection between the second housing opening port and the fan inlet port, on the one hand, and the first housing opening port and the fan outlet port, on the other, is interrupted. Within the actuator, therefore, only the second housing opening port and the fan inlet port are connected to each other, and the first housing opening port and the fan outlet port are connected.In the second position of the actuator, the flow path through the housing of the ventilation device in the direction of airflow is as follows: second housing opening, second housing opening connection, fan inlet connection, fan inlet, fan outlet, fan outlet connection, second housing opening connection and second housing opening.

[0012] The described design of the ventilation device allows for a compact design as well as a rapid reversal of the flow direction through the ventilation device, in particular without reversing the conveying direction of the fan.

[0013] A further development of the invention provides that the actuating element is a control flap rotatably mounted about a control flap pivot axis. By rotating the control flap about this pivot axis, the control flap can be positioned in its first and second positions. These two positions, i.e., the first and second positions, are angular positions relative to the control flap pivot axis. As already mentioned, the ventilation device preferably has only one actuating device, and this in turn has only one actuating element or control flap. The different flow paths through the housing are achieved solely by the different positions or angular positions of the control flap. This results in a particularly compact design of the ventilation device. Preferably, the maximum angular rotation of the control flap is greater than 0° and is at most 90°.

[0014] According to the invention, the actuating device comprises an actuating device housing in which an actuating counter-element with four closed openings is arranged. In the first position, the actuating element opens two of the openings, and in the second position, it opens two of the openings, while closing the other openings. Both the actuating counter-element and the actuating element are arranged within the actuating device housing. While the actuating counter-element is stationary, particularly with respect to the actuating device housing and / or the housing of the ventilation device, the actuating element is movable between its two positions. The actuating element and the actuating counter-element interact to convert the different flow paths through the housing. For this purpose, the actuating counter-element has the four closed openings.This means that each of the openings is bounded by a continuous rim formed by the actuating element. The actuating device housing is preferably made of plastic and / or metal. Particularly preferably, the actuating device housing consists of several identical parts connected to one another.

[0015] In each of its positions, i.e., in the first and second positions, the actuating element closes two of the openings and opens two others. To close the openings, the actuating element seals against the edge surrounding the openings to be closed and is spaced at least partially, and in particular completely, from the edge surrounding the openings to be opened. The openings closed by the actuating element are also referred to as first openings, and the openings opened by the actuating element are also referred to as second openings. Depending on the position of the actuating element, different openings are designated as first openings and second openings. The described design of the actuating device enables a particularly compact construction.

[0016] A further development of the invention provides that the actuating element is rotatably arranged between two walls of the actuating device housing. The walls are preferably arranged parallel to each other and spaced apart, accommodating the actuating element and the counter-actuating element between them. It is possible for the walls to be integrally formed with the counter-actuating element and made of the same material. However, the walls can also be separate from the counter-actuating element and seal against it. It is preferred that the actuating element seals against the walls regardless of its position. In particular, the actuating element should also seal against the walls in intermediate positions between the first and second positions.

[0017] Alternatively, the actuator is positioned so that it can be moved quickly and with minimal friction between its positions. In this case, the provision of the different flow paths through the housing is achieved, in particular, by the actuator bearing against the edges that define the openings of the counter-actuator. The described design of the actuator housing, and thus of the actuator itself, allows for simple assembly of the ventilation system, since the actuator is designed completely separately from the ventilation system housing and is simply inserted into it during assembly.

[0018] A further development of the invention provides that an actuator, connected to the actuating element, is located between the walls and spaced apart from the actuating element. The actuator is designed and configured to drive the actuating element. By means of the actuator, the actuating element can be moved between its positions and, in particular, brought into the first and second positions. The actuator is preferably an electric actuator; in this case, it preferably has an electric motor or is designed as such. The electric motor is, for example, an electrically commutated electric motor, a stepper motor, a geared motor, or a linear motor. To enable a particularly compact design of the actuating device, the actuator is arranged between the two walls, i.e., it is axially aligned with the actuating element with respect to the axis of rotation of the actuating flap.The actuator is arranged in such a way that it is spaced away from the actuator element in both the first position and the second position, as well as in any intermediate position between the first and second positions, thus enabling the actuator element to be moved between its two positions without interference.

[0019] A further development of the invention provides that the actuator is connected to the actuating element via a transmission, in particular a gear transmission, which is arranged at least partially outside the actuator housing. The gear transmission has several gears, one of which is connected to the actuator and another to the actuating element or a shaft coupled to the actuating element, preferably directly. The gears interact with each other, in particular meshing directly with each other. Alternatively, the transmission can be designed as a belt drive or a linkage drive. The transmission is preferably designed with a gear ratio other than 1:1; for example, a gear ratio is implemented that converts a higher speed of the actuator into a lower speed of the actuating element or the shaft.The separation of the actuator from the actuating element is preferably achieved through a corresponding design of the gear drive. The gear drive also serves to implement the compact design of the ventilation unit.

[0020] A further development of the invention provides that the first housing opening opens into a flow chamber formed within the housing and connected fluidically to the first housing opening connection. The flow chamber is bounded by the housing, with the first housing opening, also formed within the housing, opening directly into the flow chamber. In cross-section, the first housing opening overlaps the flow chamber by at least 50%, at least 75%, or even completely. It thus overlaps the flow chamber to the aforementioned extent in at least two mutually perpendicular directions. The flow chamber is fluidically connected to the first housing opening connection of the actuator; in particular, the flow chamber borders directly on the first housing opening connection and thus on the actuator.In other words, the flow chamber advantageously extends from the first housing opening to the first housing opening connection. This achieves particularly good airflow through the housing, as the flow chamber also acts as a calming chamber for the air flowing through it. This results in particularly quiet operation of the ventilation system.

[0021] A further development of the invention provides that the fan outlet is fluidically connected to the fan outlet connection via a pipe extending through the flow chamber. To achieve the aforementioned compact design of the ventilation device, the fan is arranged in overlapping form with the flow chamber, particularly in the axial direction with respect to the axis of rotation of the control damper and / or an impeller axis of rotation of the fan impeller. To connect the fan outlet to the fan outlet connection in a particularly space-saving manner, the pipe is arranged within the housing. The pipe extends completely through the flow chamber, so that an interior section of the pipe is fluidically separated from the flow chamber by a wall of the pipe.The ductwork is connected, for example, to the fan outlet on one side and leads into another flow chamber on the other, which fluidically connects it to the fan outlet connection. As already described, the use of this ductwork allows for a compact design of the ventilation system.

[0022] A further development of the invention provides that the fan is arranged in a fan chamber that is permanently fluidically connected to the fan inlet and the fan inlet connection, and fluidically separated from the fan outlet. The fan chamber is formed within the housing and is thus bounded by the housing. The fan chamber is permanently fluidically connected to the fan inlet connection of the actuator, and in particular, extends to this connection. The fan is arranged in the fan chamber such that it draws air in from it. Accordingly, the fan inlet is permanently fluidically connected to the fan chamber. On the outlet side, however, the fan is fluidly separated from the fan chamber. For example, the fan outlet is directly fluidically connected to the aforementioned pipeline.However, it is also possible for the fan outlet to open into an opening in a wall bordering the fan chamber, to which, for example, the ductwork is connected. In any case, a compact design of the ventilation system is achieved.

[0023] A further development of the invention provides that a first filter element is arranged between the first housing opening connection and an external environment of the ventilation device, in particular between the first housing opening connection and the first housing opening, or in or on the first housing opening. The first filter element is designed as an air filter, for example as a coarse dust filter, medium dust filter, or fine dust filter. It is, for example, a lamellar filter or a nonwoven filter. The coarse dust filter, for example, meets the requirements of filter class G2, G3, or G4 according to EN 779:2012. The fine dust filter, for example, meets the requirements of filter class F8 according to EN 779:2012.To enable both a compact design of the ventilation unit and easy replacement of the first filter element, the first filter element is positioned between the first housing opening connection and the first housing opening. Preferably, the first filter element is located on and / or within the first housing opening, thus covering it, for example. This allows the first filter element to be easily accessible and replaced from outside the ventilation unit. Alternatively, the first filter element is located on the inside of the housing and overlaps the first housing opening. In this case, it can be replaced by opening the housing.

[0024] A further development of the invention provides that a heat storage element and / or a second filter element are arranged between the second housing opening connection and the second housing opening. The heat storage element serves to temporarily store heat, particularly during alternating venting and ventilation. In this respect, the heat storage element absorbs heat from the air flowing through it during venting and releases it during ventilation. The heat storage element is particularly preferably designed and configured to also temporarily store moisture. The heat storage element consists, for example, of a ceramic material and / or plastic. Preferably, when the ventilation device is arranged as intended, the heat storage element is inclined such that condensation is drained from it by gravity, particularly towards the second housing opening.

[0025] As an alternative to the arrangement between the second housing opening connection and the second housing opening, the heat storage unit can be arranged, from a fluid dynamics perspective, between the first housing opening connection and the first housing opening, or from a fluid dynamics perspective, between the actuator and the fan. Each arrangement has advantages and disadvantages, particularly with regard to thermal insulation.

[0026] In addition to or as an alternative to the heat storage element, a second filter element is provided. The same principles apply to this second filter element as described for the first, and reference is made to the corresponding descriptions. Preferably, the first and second filter elements have different filter classes; in particular, the first filter element is a fine dust filter and the second filter element is a coarse dust filter or a medium dust filter. For space-saving arrangement, the heat storage element and / or the second filter element are positioned between the second housing opening and the second housing opening. Preferably, they are inserted or plugged into the housing. The second filter element can be replaced by opening the housing, removing the second filter element, and inserting a different second filter element into the housing. The housing is then closed again.

[0027] The first and second filter elements are preferably angled relative to each other. This means that a first plane spanned by one of the perpendicular directions in which the first filter element has its largest dimensions, and a second plane spanned by the perpendicular directions in which the second filter element has its largest dimensions, form an angle greater than 0° and less than 180°, in particular at least 45° and at most 135°. The first and second filter elements, or the two planes, are particularly preferably perpendicular to each other. This results in a particularly compact design of the ventilation device.

[0028] A further development of the invention provides that the fan is a radial fan and has an impeller rotatably mounted about an impeller axis of rotation, wherein the first housing opening and the second housing opening are spaced apart from each other in the axial direction with respect to the impeller axis of rotation and / or the control flap axis of rotation. In principle, the fan can be designed in any configuration, for example, as an axial fan or a diagonal fan. However, the radial fan is preferred because it has the advantage over the axial fan of achieving a higher pressure differential and exhibiting less speed fluctuation during pressure changes. The radial fan is not reversible with respect to its flow direction and is therefore operated with a consistently constant flow direction.

[0029] The radial fan has an impeller driven by a fan drive. The fan drive preferably has an electric motor or is designed as such. Particularly preferably, the electric motor is electronically commutated, allowing for particularly precise adjustment of the fan's delivery rate. The impeller is rotatably mounted about its axis of rotation. The two housing openings, i.e., the first housing opening and the second housing opening, are spaced apart axially with respect to this impeller axis of rotation or, alternatively, the axis of rotation of the control flap, particularly on opposite sides of the housing of the ventilation device. This means that the ventilation device draws in air from one side of the housing and discharges it on the other side. This allows for a compact design of the ventilation device.

[0030] A further development of the invention provides that the fan inlet connection on the one hand and the fan inlet and / or the fan chamber on the other hand are fluidically connected to each other via a fan inlet channel formed in the housing, wherein the fan inlet channel is arranged in the axial direction with respect to the impeller axis of rotation and / or the control flap axis of rotation in overlap with the actuating device, in particular the actuating element, or axially offset from it. It was mentioned above that the fan chamber can extend directly to the fan inlet connection of the actuating device. Alternatively, the fan inlet connection is fluidically connected to the fan inlet and / or the fan chamber via the fan inlet channel. The fan inlet channel is formed in the housing and is bounded by it.

[0031] It can be provided that the fan inlet duct is axially aligned with the actuator with respect to the impeller axis of rotation or the actuator axis, so that the fan inlet duct and the actuator are arranged in the same plane of the ventilation system. However, it can also be provided that the fan inlet duct and the actuator are located in different planes, so that they are offset axially with respect to the impeller axis of rotation or the actuator axis of rotation, respectively, and in particular, spaced apart. For example, an intermediate layer of the housing is located between the actuator and the fan inlet duct, which limits the actuator in the direction of the fan inlet duct. Although such a design requires more installation space in the axial direction, it enables particularly low-turbulence airflow.

[0032] A further development of the invention provides that the fan inlet connection is configured in one of the walls of the actuator housing. In this case, the wall of the actuator housing forms the intermediate floor mentioned above. For example, the wall of the actuator housing is lid-shaped or pot-shaped and is inserted into a corresponding recess in the housing. The fan inlet duct is thus at least partially bounded on one side by the wall of the actuator housing and on the other side by the housing of the ventilation device. This achieves the advantages already mentioned.

[0033] The invention further relates to a method for operating a ventilation device for a building, in particular a ventilation device according to the embodiments within the scope of this description, wherein the ventilation device has a housing in which a fan and an actuating device are arranged, wherein in a first setting of the actuating device a first housing opening is connected to a fan inlet of the fan and a second housing opening to a fan outlet of the fan, and in a second setting of the actuating device the first housing opening is connected to the fan outlet of the fan and the second housing opening to the fan inlet of the fan in a fluid-technical manner.

[0034] The actuating device is provided to have a first housing opening connection fluidly connected to the first housing opening, a second housing opening connection fluidly connected to the second housing opening, a fan inlet connection fluidly connected to the fan inlet, and a fan outlet connection fluidly connected to the fan outlet, wherein a) in the first setting, an actuating element of the actuating device is arranged in a first position in which, within the actuating device, it fluidly connects the first housing opening connection and the fan inlet connection and fluidly separates them from the second housing opening connection and the fan outlet connection, and fluidly connects the second housing opening connection and the fan outlet connection and fluidly separates them from the first housing opening connection and the fan inlet connection, and wherein b) in the second setting, the actuating element of the actuating device is arranged in a second position,in which, within the actuating device, it firstly connects the second housing opening connection and the fan inlet connection fluidly and separates them fluidly from the first housing opening connection and the fan outlet connection, and secondly, it fluidly connects the first housing opening connection and the fan outlet connection and separates them fluidly from the second housing opening connection and the fan inlet connection.

[0035] The advantages of such a procedure or such a design of the ventilation system have already been mentioned. Both the ventilation system and the method for operating it can be further developed as described in this document, and reference is made to these details.

[0036] The features and combinations of features described in the description, in particular those described in the following figure description and / or shown in the figures, can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention. Thus, embodiments that are not explicitly shown or explained in the description and / or the figures, but which emerge from or can be derived from the explained embodiments, are also to be considered as encompassed by the invention.

[0037] The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing, without limiting the invention. The drawing shows: Figure 1 is a schematic representation of a first embodiment of a ventilation device for a building with a fan and an actuator, Figure 2 is a schematic representation of the actuator, and Figure 3 is a schematic representation of the ventilation device in a second embodiment.

[0038] The Figure 1Figure 1 shows a schematic representation of a first embodiment of a ventilation device 1, which serves for the supply and exhaust ventilation of a building or a room within a building. The ventilation device 1 comprises a fan 2 and an actuator 3, both of which are arranged in a housing 4 of the ventilation device 1. Only a first housing shell 5 of the housing 4 is shown here. The housing 4 also has a second housing shell 6, which is only indicated, and by means of which the fan 2 and the actuator 3 are covered and the flow channels and flow chambers located in the housing 4 are closed.

[0039] The housing 4 has a first opening 7, specifically in the second housing shell 6. The housing 4 also has a second opening 8, which is formed in the first housing shell 5. From a fluid dynamics perspective, the first opening 7 faces a first area, and the second opening 8 faces a second area. The first area is, for example, a room within the building, preferably an interior space, and the second area is another room or, preferably, an exterior environment of the building.

[0040] The ventilation device 1 is designed and configured to alternately extract and supply air to the first area, i.e., to alternately extract air from the first area through the first housing opening 7 and to supply air to it through the first housing opening 7. A fan 2 is provided for conveying the air. This fan is designed as a radial fan and accordingly has an impeller 9, which is rotatably arranged about an impeller axis of rotation 10, namely in a fan housing 11. The fan 2 has a fan inlet 12 and a fan outlet 13, which are formed on or bounded by the fan housing 11.

[0041] Due to its design as a radial fan, fan 2 draws in air axially with respect to the impeller axis of rotation 10, conveys it radially outwards, and expels it tangentially through the fan outlet 13. During operation of the ventilation device 1, fan 2 operates continuously with the same conveyance direction, thus always conveying air from the direction of the fan inlet 12 towards the fan outlet 13. To nevertheless implement alternating exhaust and supply, the actuating device 3 is designed such that, in its first setting, the first housing opening 7 is fluidically connected to the fan inlet 12 of fan 2, and the second housing opening 8 is fluidically connected to the fan outlet 13 of fan 2.In a second setting of the actuating device 3, however, the first housing opening 7 is fluidically connected to the fan outlet 13 and the second housing opening 8 to the fan inlet 12.

[0042] For this purpose, the actuator 3 has an actuating element 14, which is only indicated. In the first setting of the actuator 3, the actuating element 14 is in a first position, and in a second setting of the actuator 3, it is in a second position. The first position is shown here, so that the fan 2 conveys air from the direction of the first housing opening 7 towards the second housing opening 8. The actuator 3 has a first housing opening connection 15, a second housing opening connection 16, a fan inlet connection 17, and a fan outlet connection 18. The first housing opening connection 15 can also be referred to as the first connection, the second housing opening connection 16 as the second connection, the fan inlet connection 17 as the third connection, and the fan outlet connection 18 as the fourth connection of the actuator 3.

[0043] The actuating device 3 is designed such that, in the first position, the actuating element 14 fluidically connects the first housing opening connection 15 and the fan inlet connection 17, and also fluidly connects the second housing opening connection 16 to the fan outlet connection 18. Simultaneously, in the first position, the first housing opening connection 15 and the fan inlet connection 17 are fluidically separated from the second housing opening connection 16 and the fan outlet connection 18.

[0044] Furthermore, the actuating device 3 is designed such that, in the second position, the actuating element 14 fluidically connects the second housing opening connection 16 and the fan inlet connection 17, and also fluidly connects the first housing opening connection 15 with the fan outlet connection 18. Simultaneously, in the first position, the second housing opening connection 16 and the fan inlet connection 17 are fluidically separated from the first housing opening connection 15 and the fan outlet connection 18.

[0045] It can be seen that the first housing opening 7 opens into a flow chamber 19 formed in the housing 4. The flow chamber 19 is fluidically connected to the first housing opening connection 15 of the actuating device 3; preferably, as shown here, it extends to the first housing opening connection 15. The flow chamber 19 is formed in the first housing shell 5 and is covered by the second housing shell 6, in which the first housing opening 7 is formed. A pipe 20 is arranged in the flow chamber 19 and completely passes through it. The pipe 20 fluidically bridges the flow chamber 19 in such a way that the fan outlet 13 is fluidically connected to the fan outlet connection 18. For this purpose, the pipe 20 connects the fan outlet 13 to a flow chamber 21, which is formed in the housing 4 and extends to the fan outlet connection 18.

[0046] The fan 2 is arranged in a fan chamber 22 formed within the housing 4. The fan chamber 22 is fluidically connected to the fan inlet connection 17, and in particular extends to this connection. The fan 2 is arranged in the fan chamber 22 such that its fan inlet 12 is permanently in flow communication with the fan chamber 22, so that the fan 2 draws air from the fan chamber 22 during operation. The fan outlet 13, on the other hand, is fluidically separated from the fan chamber 22, for example also by means of the pipe 20, which in this case extends partially through the fan chamber 22.

[0047] A first filter element 23 is arranged between the first housing opening 7 and the actuator 3. The second housing opening connection 16 of the actuator 3 is fluidically connected to the second housing opening 8 via a further flow chamber 23. A heat storage element 24 and a second filter element 25 are arranged in the flow chamber 23, optionally.

[0048] The actuating element 14 of the actuating device 3 is designed as a control flap, which is rotatably mounted about a control flap pivot axis 27. For this purpose, the actuating element 14, or the control flap, is arranged on a control flap shaft 28 and can be driven by means of an actuator 29 (not shown here). The mounting is implemented, for example, by means of one or more rolling bearings and / or sliding bearings. To adjust the different flow paths through the ventilation device 1, the actuating element 14 interacts, at least temporarily, with a counter-actuating element 30. Openings 31, 32, 33, and 34, shown here only schematically, are formed in the counter-actuating element 30 and are closed at the edges. This means that each of the openings 31, 32, 33, and 34 is bounded by a continuous edge formed by the counter-actuating element 30.In the first position shown here, the actuating element 14 closes openings 31 and 32, but leaves openings 33 and 34 open. In the second position, however, the actuating element 14 closes openings 33 and 34 and leaves openings 31 and 32 open.

[0049] The actuating element is arranged between two walls 35 and 36 of the actuating device 3, with only a portion of wall 36 shown here within a cutout. Walls 35 and 36 are preferably integrally formed and made of the same material as the actuating counter-element 30; however, they can also be manufactured separately and fluid-tightly joined to one another. The actuating device 3 is arranged as a whole in an actuating device chamber 37, which is manufactured in the housing 4. Preferably, the flow chamber 19, the flow chamber 21, the fan chamber 22, the flow chamber 24, and the actuating element chamber 37 have a continuously flat bottom 38 and / or are bounded on one side opposite the bottom 38 by a flat ceiling, which is present on the second housing shell 6.

[0050] The Figure 2Figure 1 shows a schematic representation of the actuating device 3. The walls 35 and 36 are shown in particular, clearly demonstrating that they are not continuous in the circumferential direction with respect to the actuating flap pivot axis 27, or rather, that they have different dimensions in the radial direction. Thus, in areas swept over by the actuating element 14 during its movement, the walls 35 and 36 extend further outwards than in areas that are always spaced away from the actuating element 14. The actuating counter element 30, in which the openings 31, 32, 33, and 34 are formed, is also visible.

[0051] As already mentioned, the actuating element 14 is designed as a control flap and is mounted on the control flap shaft 28, by means of which it is rotatably mounted about the control flap pivot axis 27. The actuating element 14 has several continuous circumferential webs 39 that project beyond a base element 40 of the actuating element 14 on opposite sides. The webs 39 are arranged such that they each bear against the counter-actuating element 30, at least temporarily, completely encompassing one of the openings 31, 32, 33, and 34. The webs 39 are made, for example, of a sealing material, in particular a material that has greater flexibility or lower stiffness than the material from which the base element 40 is made. The webs 39 consist, in particular, of foam and / or are injection-molded onto the base element 40 using a two-component injection molding process. Additionally or alternatively, a labyrinth seal is implemented.

[0052] The actuator 29 is now also visible. It is located between walls 35 and 36 and is thus exposed to the air supplied by the fan 2 during operation of the ventilation unit 1. This ensures reliable cooling of the actuator 29 and also keeps the space requirement of the actuator 3 particularly low. The actuator 29 is connected to the actuating element 14 or the damper shaft 28 via a gear transmission 41. This transmission has gears 42 and 43, with gear 42 rigidly connected to a motor shaft of the actuator 29 and gear 43 rigidly connected to the damper shaft 28. Gears 42 and 43 mesh with each other. They are also designed such that a higher speed of the actuator 29 is converted into a lower speed of the actuating element 14.

[0053] The Figure 3Figure 1 shows a schematic representation of the ventilation device 1 in a second embodiment. This embodiment is fundamentally similar to the first embodiment, so reference is made to the preceding descriptions, and only the differences are discussed below. These differences lie in a different airflow path between the fan inlet connection 17 and the fan inlet 12. Furthermore, the housing openings 7 and 8 are arranged in the axial direction, overlapping the fan 2 and the actuator 3. Some elements are not shown or are only shown in a simplified form, for example, the filter elements 23 and 26. The flow connection between the fan inlet 12 and the fan chamber 22 now lies in a different plane and is realized via a recess 44 in the wall 36.Accordingly, a fan inlet channel 45 is provided, which is arranged on the side of the wall 36 facing away from the fan outlet connection 18 and extends from the recess 44 to the fan chamber 22. The described design enables a particularly low-turbulence flow path. REFERENCE MARK LIST

[0054] 1. Ventilation device 2. Fan 3. Actuator 4. Housing 5. Housing shell 6. Housing shell 7. Housing opening 8. Housing opening 9. Impeller 10. Impeller pivot 11. Fan housing 12. Fan inlet 13. Fan outlet 14. Actuator 15. Housing opening connection 16. Housing opening connection 17. Fan inlet connection 18. Fan outlet connection 19. Flow chamber 20. Piping 21. Flow chamber 22. Fan chamber 23. Filter element 24. Flow chamber 25. Heat storage 26. Filter element 27. Actuator damper pivot 28. Actuator damper shaft 29. Actuator 30. Actuator counter element 31. Opening 32. Opening 33. Opening 34. Opening 35. Wall 36. Wall 37. Actuator chamber 38 Base 39 Web 40 Base element 41 Gear drive 42 Gear 43 Gear 44 Recess 45 Fan inlet channel

Claims

1. Ventilation device (1) for a building, with a housing (4) in which a fan (2) and an actuating device (3) are arranged, wherein, in a first setting of the actuating device (3), a first housing opening (7) is in fluid connection with a fan inlet (12) of the fan (2) and a second housing opening (8) is in fluid connection with a fan outlet (13) of the fan (2) and, in a second setting of the actuating device (3), the first housing opening (7) is in fluid connection with the fan outlet (13) of the fan (3) and the second housing opening (8) is in fluid connection with the fan inlet (12) of the fan (2), wherein the actuating device (3) has a first housing opening connection (15) in fluid connection with the first housing opening (7), a second housing opening connection (16) in fluid connection with the second housing opening (8), a fan inlet connection (17) in fluid connection with the fan inlet (12) of the fan (2), and a fan outlet connection (18) in fluid connection with the fan outlet (13) of the fan (2), wherein a) in the first setting, an actuating element (14) of the actuating device (3) is arranged in a first position in which, within the actuating device (3), it fluidically connects the first housing opening connection (15) and the fan inlet connection (17) to each other and fluidically separates them from the second housing opening connection (16) and the fan outlet connection (18), and on the other hand fluidically connects the second housing opening connection (16) and the fan outlet connection (18) to each other and fluidically separates them from the first housing opening connection (15) and the fan inlet connection (17), and b) in the second setting, the actuating element (14) of the actuating device (3) is arranged in a second position in which, within the actuating device, it fluidically connects the second housing opening connection (16) and the fan inlet connection (17) to each other and fluidically separates them from the first housing opening connection (15) and the fan outlet connection (18) and, on the other hand, fluidically connects the first housing opening connection (15) and the fan outlet connection (18) to each other and fluidically separates them from the second housing opening connection (16) and the fan inlet connection (17), characterised in that the actuating device (3) comprises a actuating device housing in which an actuating counter element (30) with four closed-edge openings (31, 32, 33, 34) is arranged, wherein the actuating element (14) opens two first of the openings (31, 32, 33, 34) in the first position and two second openings (31, 32, 33, 34) in the second position and closes the other openings (31, 32, 33, 34) in each case.

2. Ventilation device according to claim 1, characterised in that the actuating element (14) is a control flap rotatably mounted about a control flap axis of rotation (27).

3. Ventilation device according to one of the preceding claims, characterised in that the actuating element (14) is rotatably arranged between two walls (35, 36) of the actuating device housing.

4. Ventilation device according to one of the preceding claims, characterised in that an actuating drive (29) drivingly connected to the actuating element (14) is provided at a distance from the actuating element (14) between the walls (35, 36).

5. Ventilation device according to one of the preceding claims, characterised in that the actuating drive (29) is drivingly connected to the actuating element (14) by means of a gearbox (41) arranged at least partially outside the actuating device housing.

6. Ventilation device according to one of the preceding claims, characterised in that the first housing opening (7) opens into a flow chamber (19) which is in fluid connection with the first housing opening connection (15) and is formed in the housing (4).

7. Ventilation device according to one of the preceding claims, characterised in that the fan outlet (13) is in fluid connection with the fan outlet connection (18) via a pipe (20) passing through the flow chamber (19).

8. Ventilation device according to one of the preceding claims, characterised in that the fan (2) is arranged in a fan chamber (22) which is in permanent fluid connection with the fan inlet (12) and the fan inlet connection (17) and fluidically separated from the fan outlet (13).

9. Ventilation device according to one of the preceding claims, characterised in that a first filter element (23) is arranged between the first housing opening connection (15) and the outer environment of the ventilation device (1) in terms of fluid flow.

10. Ventilation device according to one of the preceding claims, characterised in that a heat storage (25) and / or a second filter element (26) are arranged between the second housing opening connection (16) and the second housing opening (8) in terms of fluid flow.

11. Ventilation device according to one of the preceding claims, characterised in that the fan (2) is a radial fan and comprises an impeller (9) which is rotatably mounted so as to be able to rotate about an impeller axis of rotation (10), wherein the first housing opening (7) and the second housing opening (8) are spaced apart from each other in the axial direction with respect to the impeller axis of rotation (10) and / or the control flap axis of rotation (27).

12. Ventilation device according to one of the preceding claims, characterised in that the fan inlet connection (17) on the one hand and the fan inlet (12) and / or the fan chamber (22) on the other hand are in fluid connection with each via a fan inlet duct (45) formed in the housing (4), wherein the fan inlet duct (45) is arranged in axial overlap with the actuating device (3) relative to the impeller axis of rotation (10) and / or the control flap axis of rotation (27) or axially offset relative to the actuating device (3).

13. Ventilation device according to one of the preceding claims, characterised in that the fan inlet connection (17) is formed in one of the walls (35, 36) of the control device housing.

14. Method for operating a ventilation device (1) for a building, in particular a ventilation device (1) according to one or more of the preceding claims, wherein the ventilation device (1) has a housing (4) in which a fan (2) and an actuating device (3) are arranged, wherein, in a first setting of the actuating device (3), a first housing opening (7) is in fluid connection with a fan inlet (12) of the fan (2) and a second housing opening (8) is in fluid connection with a fan outlet (13) of the fan (2) and, in a second setting of the actuating device (3), the first housing opening (7) is in fluid connection with the fan outlet (13) of the fan (3) and the second housing opening (8) is in fluid connection with the fan inlet (12) of the fan (2), wherein the actuating device (3) has a first housing opening connection (15) in fluid connection with the first housing opening (7), a second housing opening connection (16) in fluid connection with the second housing opening (8), a fan inlet connection (17) in fluid connection with the fan inlet (12) of the fan (2), and a fan outlet connection (18) in fluid connection with the fan outlet (13) of the fan (2), wherein a) in the first setting, an actuating element (14) of the actuating device (3) is arranged in a first position in which, within the actuating device (3), it fluidically connects the first housing opening connection (15) and the fan inlet connection (17) to each other and fluidically separates them from the second housing opening connection (16) and the fan outlet connection (18), and on the other hand fluidically connects the second housing opening connection (16) and the fan outlet connection (18) to each other and fluidically separates them from the first housing opening connection (15) and the fan inlet connection (17), and b) in the second setting, the actuating element (14) of the actuating device (3) is arranged in a second position in which, within the actuating device, it fluidically connects the second housing opening connection (16) and the fan inlet connection (17) to each other and fluidically separates them from the first housing opening connection (15) and the fan outlet connection (18) and, on the other hand, fluidically connects the first housing opening connection (15) and the fan outlet connection (18) to each other and fluidically separates them from the second housing opening connection (16) and the fan inlet connection (17), characterised in that the actuating device (3) comprises a actuating device housing in which an actuating counter element (30) with four closed-edge openings (31, 32, 33, 34) is arranged, wherein the actuating element (14) opens two first of the openings (31, 32, 33, 34) in the first position and two second openings (31, 32, 33, 34) in the second position and closes the other openings (31, 32, 33, 34) in each case.