Vehicle cabin ventilation apparatus with pressure limiting valve assembly

Abstract

The invention relates to a vehicle interior ventilation device (20) having a pressure-limiting valve assembly (21) and a frame-shaped component (22) for laterally delimiting the pressure-limiting valve assembly (21) and / or fixing the pressure-limiting valve assembly (21) in a receiving opening of a vehicle body component (30). In particular, according to the invention, the vehicle interior ventilation device (20) has a fan device (23) which is actuated or can be actuated as required.

Description

[0001] The present invention generally relates to a ventilation device for the interior space of a vehicle, wherein such a ventilation device is also referred to herein as a "pressure relief valve assembly". A ventilation device or pressure relief valve assembly for the interior space of a vehicle typically has a frame surrounding a ventilation opening, with at least one flap that is pivotally openable from the ventilation opening located on the outside of the frame.

[0002] Such ventilation equipment or pressure relief valve assemblies are commonly known in various implementations.

[0003] In this context, for example, reference DE 35 03 600 A1. In pressure relief valve assemblies known from the prior art, airflow can reach the outside from the vehicle interior via a ventilation opening, specifically in such a way that the airflow, due to adjustment of the pressure ratio, lifts at least one flap of the pressure relief valve assembly away from the frame. On the other hand, the flap, which is now located on the frame, successfully prevents ambient air from entering the vehicle interior.

[0004] Accordingly, the type of pressure relief valve assembly considered here is used, for example, to reduce the accumulation of air pressure in the vehicle's interior space when the vehicle's tailgate is closed. The pressure relief valve, typically designed as a flap, can open when the air pressure in the vehicle's interior space increases, allowing air to escape from the interior space, thereby reducing the air pressure in the vehicle's interior space and, for example, reducing the force required to close the tailgate.

[0005] Furthermore, vehicles equipped with pressure relief valve assemblies can influence airflow from the vehicle cabin to improve passenger comfort. Since the air conditioning system draws in ambient air from outside the vehicle and directs it into the cabin, ventilation via pressure relief valve assemblies is necessary to ensure proper circulation and reduce pressure buildup.

[0006] However, noise can still enter the vehicle cabin from the outside, especially when the pressure relief valve, which is part of the pressure relief valve assembly, is open. Furthermore, even when the pressure relief valve is closed, noise can still enter the vehicle cabin from the outside. Additionally, in certain driving situations, the noise from the pressure relief valve closing can be disturbing to vehicle occupants.

[0007] To reduce noise intrusion and the intrusion of external elements into the vehicle's interior compartment, the pressure relief valve can be designed to be as small as possible, but this limits the speed of pressure compensation that can be achieved using the pressure relief valve assembly.

[0008] Instead, in order to achieve pressure compensation by means of a pressure relief valve assembly, it is conceivable that the pressure relief valve assembly is provided with a "muffler" to reduce noise. For this purpose, it is known to fit a cover onto the pressure relief valve assembly so as to form a muffler space, wherein when the pressure relief valve assembly is open, the flow path between the vehicle interior space and the outside atmosphere extends at least partially through the muffler space.

[0009] The purpose of this invention is to improve a ventilation device of the above type for vehicle cabins, thereby improving the overall passive safety of the vehicle.

[0010] In particular, appropriate ventilation equipment is needed to ensure that no pollutants can enter the vehicle's interior from the outside. This applies to both "normal" vehicle operation and situations where a vehicle malfunction, such as a battery failure, causes the battery to burn and release pollutants.

[0011] The objective of this invention is achieved by the vehicle cabin ventilation device according to claim 1 of the independent patent.

[0012] Accordingly, the present invention particularly relates to a vehicle cabin ventilation device having: a pressure relief valve assembly and a frame-shaped member for laterally surrounding the pressure relief valve assembly and / or securing it in a receiving opening in a vehicle body component.

[0013] In particular, the ventilation device according to the invention is characterized in that the vehicle cabin ventilation device has a fan device that can be controlled or manipulated as needed.

[0014] In other words, the present invention relates to a ventilation device in which vehicle safety is improved by means of an active device, namely a fan device that can be controlled as needed.

[0015] According to the embodiment of the ventilation device proposed by the present invention, the ventilation device has a cover that at least partially or partially forms a housing, the cover preferably being connected or connectable to the frame member of the pressure relief valve assembly by means of a form-fit connection, particularly a clamping connection, especially in a detachable or replaceable manner. In the connected state between the cover and the frame member of the pressure relief valve assembly, the cover at least partially or partially receives and correspondingly positions or secures the fan device.

[0016] Here, with the cover and the frame-shaped member of the pressure relief valve assembly connected, the fan device can be at least partially or partially accommodated in the area defined by the cover and the frame-shaped member.

[0017] Alternatively, it is conceivable that the cover is configured to receive the fan assembly at least partially or partially, preferably in a detachable or replaceable manner.

[0018] In this context, it is conceivable that the cover has, in particular, a receiving area designed at least partially or partially to complement the outer contour of the fan assembly, in which the fan assembly can be received.

[0019] According to the improved design variant mentioned last, the cover has an inlet area on a first end side and an outlet area on the opposite second end side, wherein the pressure relief valve assembly is arranged or may be arranged on or in the outlet area of ​​the cover.

[0020] Here, the fan device can be arranged or may be arranged on or within the entrance area of ​​the cover.

[0021] In the ventilation device according to the invention, the pressure relief valve assembly preferably has at least one check valve, which is designed to allow gas flow, and in particular air flow, to flow only from the inlet area of ​​the cover to or through the outlet area.

[0022] Provided herein, the at least one check valve has at least one closing element, particularly in the form of a check valve disc, wherein the at least one closing element is movable, particularly pivotal, between an open position and a closed position.

[0023] For example, the at least one check valve can be configured such that the at least one shut-off element is pressed into a sealing seat associated with the at least one shut-off element due to gravity and / or the flow pressure of the gas flow, and especially the air flow.

[0024] However, it is conceivable that, alternatively, the at least one check valve is configured as a spring-loaded check valve.

[0025] The fan device used in the ventilation device according to the invention is preferably designed to facilitate the flow of gas, and in particular air, from the inlet area of ​​the cover to or through the outlet area as needed.

[0026] In particular, according to the implementation of the ventilation device of the present invention, the fan device has at least one axial fan.

[0027] Preferably, the fan unit is associated with an energy source, particularly independent of the vehicle's power supply, to power the fan unit as needed.

[0028] According to the embodiment of the ventilation device proposed by the present invention, the ventilation device has at least one sensing system. However, alternatively, the ventilation device may also be associated with at least one sensing system.

[0029] The at least one sensing system has at least one air quality sensor configured to monitor air, particularly continuously or at predetermined or determinable times and / or events, especially in vehicle compartments and / or in housings at least partially or partially formed by covers, with the aim of detecting and determining pollutants.

[0030] In a further improvement of the design variant mentioned last, the ventilation device has a control device and the ventilation device is associated with the control device, which is configured to: assess the type and / or concentration of any pollutant that may be selectively determined by the at least one air quality sensor, and to operate the fan device when a critical pollutant type and / or pollutant concentration is reached and / or exceeded.

[0031] As a replacement or addition to a fan device that can be controlled as needed, a passive device can also improve vehicle safety.

[0032] For example, it is conceivable that the vehicle cabin ventilation equipment includes: a first pressure relief valve assembly; and a frame-shaped member for laterally defining the pressure relief valve assembly and / or fixing it in an receiving opening in the vehicle body component; and a second pressure relief valve assembly arranged in series with the first pressure relief valve assembly in a flow sense, such that a flow-stable zone is formed between the first pressure relief valve assembly and the second pressure relief valve assembly.

[0033] The advantages that can be achieved by using this design variant, which can also be used in combination with a fan unit, are obvious: since the two pressure relief valve assemblies are connected in series with each other in a flow sense, and a steady flow zone is formed between the two pressure relief valve assemblies, it is particularly effective to prevent selectively contaminated air from entering the vehicle compartment from the external area of ​​the vehicle.

[0034] Here, the present invention is based on the understanding that for conventional ventilation systems with only one pressure-limiting valve assembly, if a turbulent flow field exists in the outlet region of the pressure-limiting valve assembly, there is a risk that the pressure-limiting valve assembly may open at least partially or locally. This may occur, especially when the vehicle interior space is not overpressurized (compared to the external atmospheric pressure) and a turbulent flow field exists in the outlet region of the pressure-limiting valve assembly. In this case, if the pressure-limiting valve assembly opens due to the vortex field, it is impossible to prevent pollutants from entering the vehicle compartment in a conventional ventilation system.

[0035] Because the first (external) pressure relief valve assembly is downstream of the second (internal) pressure relief valve assembly in a flow sense, it effectively prevents outside air and / or contaminants from entering the vehicle compartment. Even if the first (external) pressure relief valve assembly is at least partially or partially opened due to an external vortex field, the second (internal) pressure relief valve assembly remains in its closed position. This is because a flow stabilization zone is provided between the first and second pressure relief valve assemblies, preventing the second (internal) pressure relief valve assembly from accidentally opening or from opening due to a flow vortex field in a flow sense.

[0036] The solution according to the invention particularly allows the use of pressure-limiting valve assemblies with only very small flow resistance.

[0037] In other words, the pressure relief valve assembly used in the solution according to the invention minimizes pressure loss while simultaneously ensuring that contaminants are prevented from accidentally entering the vehicle compartment.

[0038] According to an embodiment of the ventilation device proposed by the present invention, the ventilation device has a housing that at least partially or partially defines a flow channel. The housing has an inlet region on a first end side and an outlet region on a opposite second end side. Here, a first (external) pressure relief valve assembly is arranged on or therein in the outlet region of the housing, while a second (internal) pressure relief valve assembly is arranged or may be arranged on or therein in the inlet region of the housing.

[0039] In this context, it is conceivable in principle that the frame-shaped member of the first pressure-relieving valve assembly is part of the housing. In other words, the frame-shaped member of the first pressure-relieving valve assembly can be formed as a single piece with the housing. However, alternatively, it is conceivable that the frame-shaped member of the first pressure-relieving valve assembly is connected to the housing in a material-fitting manner, for example, by bonding or welding.

[0040] However, it is also conceivable that the frame-shaped member of the first pressure relief valve assembly is connected to or may be connected to the outlet area of ​​the housing, particularly by means of a form-fit connection, such as a clamping connection.

[0041] In principle, the second pressure relief valve assembly is provided to have a frame-like member for laterally defining and / or securing the second pressure relief valve assembly. Similarly, it is also conceivable that the frame-like member of the second pressure relief valve assembly is part of the housing.

[0042] However, it is preferable that the frame-shaped member of the second pressure relief valve assembly is connected to or can be connected to the inlet area of ​​the housing, particularly by means of a shape fit, preferably by a clamping connection.

[0043] The housing of the ventilation equipment at least partially or partially defines the flow stabilization zone between the first pressure relief valve assembly and the second pressure relief valve assembly.

[0044] According to the implementation of the ventilation device of the present invention, the first pressure relief valve assembly has at least one check valve, which is designed to allow gas flow, and in particular air flow, to flow only from the inlet area of ​​the housing to or through the outlet area.

[0045] Also advantageously, the second pressure relief valve assembly has at least one check valve configured to allow gas flow, and in particular air flow, to flow only from or only through the inlet region of the housing to the outlet region.

[0046] The at least one check valve preferably has at least one closing element, particularly in the form of a check valve disc. Here, the at least one closing element of the at least one check valve is movable, particularly pivotal, between an open position and a closed position.

[0047] In particular, the at least one check valve is designed such that the at least one shut-off element is pressed into a sealing seat associated with the at least one shut-off element due to gravity and / or the flow pressure of the gas flow, and especially the air flow.

[0048] However, it is conceivable that, alternatively, the at least one check valve is configured as a spring-loaded check valve.

[0049] The size and / or design of the steady flow zone are determined in a way that ensures no turbulence occurs in the steady flow zone that could accidentally open the second pressure relief valve assembly.

[0050] According to an embodiment of the invention, in terms of the simplified construction of the ventilation device of the invention, the second pressure relief valve assembly is at least substantially the same in structure as the first pressure relief valve assembly.

[0051] The present invention will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings of the ventilation device according to the present invention.

[0052] In the attached diagram:

[0053] Figure 1 An exemplary first embodiment of a ventilation device (not claimed) is shown schematically and in a first isometric view;

[0054] Figure 2 An exemplary first embodiment of a ventilation device (not claimed) is shown schematically and in a second isometric view;

[0055] Figure 3 An exemplary first embodiment of a ventilation device (not claimed) is shown schematically and in a first isometric exploded view;

[0056] Figure 4An exemplary first embodiment of a ventilation device (not claimed) is shown schematically and in a second isometric exploded view;

[0057] Figure 5 An exemplary first embodiment of a ventilation device (not claimed) is shown schematically and in cross-sectional view in which the pressure relief valve assemblies are in their closed positions.

[0058] Figure 6 An exemplary first embodiment of a ventilation device (not claimed) in a cross-sectional view is shown in which pressure relief valve assemblies are respectively in their open positions.

[0059] Figure 7 An exemplary first embodiment of a ventilation device (not claimed) is shown schematically and in isometric cross-sectional views;

[0060] Figure 8 An exemplary second embodiment of the ventilation device of the present invention is shown schematically and in a first isometric view;

[0061] Figure 9 An exemplary second embodiment of the ventilation device of the present invention is shown schematically and in a second isometric view;

[0062] Figure 10 An exemplary second embodiment of the ventilation device of the present invention is shown schematically and in a first isometric exploded view;

[0063] Figure 11 An exemplary second embodiment of the ventilation device of the present invention is shown schematically and in a second isometric exploded view;

[0064] Figure 12 An exemplary second embodiment of the ventilation device of the present invention is shown schematically and in cross-sectional view;

[0065] Figure 13 An exemplary third embodiment of the ventilation device of the present invention is shown schematically and in a first isometric exploded view;

[0066] Figure 14 An exemplary third embodiment of the ventilation device of the present invention is shown schematically and in a second isometric exploded view;

[0067] Figure 15 An exemplary third embodiment of the ventilation device of the present invention is shown schematically and in isometric view; and

[0068] Figure 16 An exemplary third embodiment of the ventilation device of the present invention is shown schematically and in cross-sectional view.

[0069] exist Figures 1 to 7 An exemplary first embodiment of an unclaimed ventilation device 1 is shown. The ventilation device 1 is used to ventilate the interior space of a vehicle as needed.

[0070] An exemplary first embodiment of the ventilation device 1 includes a first pressure-limiting valve assembly 2 and a second pressure-limiting valve assembly 4 arranged in series with the first pressure-limiting valve assembly 2 in a flow sense. A flow stabilization zone 6 is formed between the two pressure-limiting valve assemblies 2 and 4 connected in series in a flow sense.

[0071] Each pressure relief valve assembly 2, 4 has frame-shaped members 3, 5, which laterally define the pressure relief valve assembly 2, 4.

[0072] The pressure relief valve assemblies 2 and 4 themselves include at least one check valve, which is configured to allow gas flow, and in particular air flow, only from the inlet area 8 of the ventilation device 1 to or through the outlet area 9 of the ventilation device 1.

[0073] like Figures 1 to 7 As shown, an exemplary embodiment of the ventilation device 1 also includes a housing 7 defining a flow channel. The housing 7 has an inlet region 8 at a first end and an outlet region 9 at the opposite second end. Here, a first pressure-limiting valve assembly 2 is arranged on or therein in the outlet region 9 of the housing, and a second pressure-limiting valve assembly 4 is arranged on or therein in the inlet region 8 of the housing 7.

[0074] In ventilation equipment 1 Figures 1 to 7 In the design variant shown, the frame-shaped member 3 of the first pressure relief valve assembly 2 is fixedly connected to the outlet region 9 on the end side of the housing 7. In particular, it is conceivable that the frame-shaped member 3 of the first pressure relief valve assembly 2 is integrally connected to the housing 7 or to the outlet region 9 on the end side of the housing 7.

[0075] It is also conceivable that the frame-shaped member 3 of the first pressure relief valve assembly 2 is connected to the outlet area 9 of the housing 7 in a detachable manner, for example by form-fit connection (such as clamping connection 10).

[0076] The frame-shaped member 5 of the second pressure relief valve assembly 4 is connected to the inlet area 8 of the housing 7, wherein a form-fit connection, particularly a clamping connection 10, is preferably used for this purpose.

[0077] If can be based on Figure 5 and Figure 6 The cross-sectional view shows that the frame-shaped member 5 of the second pressure relief valve assembly 4 is used to fix the ventilation device 1 in the receiving opening of the vehicle body member 30.

[0078] It is also conceivable that the ventilation device 1 is connected to the vehicle body component 30 via the frame-shaped component 3 of the first pressure relief valve assembly 2.

[0079] The first pressure relief valve assembly and the second pressure relief valve assemblies 2 and 4 are preferably designed to be at least substantially identical in structure.

[0080] As shown in the figure, each pressure relief valve assembly 2, 4 has multiple check valves (here: three check valves each). Each check valve includes a closing element 11 in the form of a check valve disc, wherein the closing element 11 is capable of being in the open position (see Figure 11). Figure 6 ) and closing position (see Figure 5 Movement between ( ), especially pivoting.

[0081] exist Figures 1 to 7 As illustrated in the ventilation device 1, the closing element 11 of the corresponding check valve is pressed into the sealing seat associated with the corresponding closing element 11 due to gravity and the flow pressure of the gas flow, especially the air flow.

[0082] A flow stabilization zone 6, as mentioned, is provided between the two pressure relief valve assemblies 2 and 4, which are connected in series in a flow sense. This flow stabilization zone is used to smooth any turbulent airflow passing through, especially the first (outer) pressure relief valve assembly 2.

[0083] Here, viewed in the flow direction through the ventilation device 1, the length of the flow stabilizing zone 6 is 0.5 to 1.5 times, and preferably 0.8 to 1.2 times, the length of the closing element 11 of the check valve of the second pressure limiting valve assembly 4.

[0084] The following will refer to Figures 8 to 12 The illustrations in the figure are used to describe in more detail an exemplary embodiment of the ventilation device 20 of the present invention.

[0085] The ventilation device 20 of the present invention Figures 8 to 12 The exemplary embodiment shown schematically only includes a pressure relief valve assembly 21, which is associated with a frame-like member 22 for laterally defining and / or fixing the pressure relief valve assembly 21. The ventilation device 20 may also be connected to the vehicle body structure via the frame-like member 22.

[0086] A notable feature of an exemplary embodiment of the ventilation device 20 of the present invention is that the ventilation device has a fan assembly 23 that is operable or controllable as needed.

[0087] As shown in the figure, the fan assembly 23 can be an axial flow fan. However, it is also conceivable in principle to use other designs of the fan assembly 23, such as a diagonal flow fan, a radial flow fan / centrifugal fan, or a tangential or crossflow fan.

[0088] Although not shown in the accompanying drawings, the fan assembly 23 is preferably associated with an energy source (e.g., a battery) that is particularly independent of the vehicle's power supply, for supplying power to the fan assembly 23 as needed.

[0089] According to an exemplary embodiment of the present invention, the ventilation device 20 further has a cover 24 that at least partially or partially forms a housing.

[0090] The cover 24 is preferably connected to the frame member 22 of the pressure relief valve assembly 21 by a form-fit connection, particularly a clamping connection 25, and especially in a detachable or replaceable manner. In the connected state of the cover 24 and the frame member 22 of the pressure relief valve assembly 21, the cover at least partially or partially receives the fan device 23 and correspondingly positions the fan device 23.

[0091] The cover 24 has an inlet region 26 on a first end side and an outlet region 27 on the opposite second end side, wherein the pressure relief valve assembly 21 is arranged on or in the outlet region 27 of the cover 24.

[0092] The pressure relief valve assembly 21 has at least one (here: three in total) check valve, which is designed to allow gas flow, and in particular air flow, only from the inlet region 26 of the cover 24 to or through the outlet region 27.

[0093] For example, it can be based on Figure 10 and Figure 11 As seen in the exploded view, each check valve has a closing element 11 in the form of a check valve disc, wherein the closing element 11 is movable, in particular, pivoting, between an open position and a closed position.

[0094] Here, the check valve is configured such that the closing element 11 is pressed into the sealing seat associated with the closing element 11 by gravity and / or the flow pressure of the gas flow, and especially the air flow. However, it is also conceivable in principle that the check valve is configured as a spring-loaded check valve.

[0095] The fan device 23 is configured to cause gas flow, and in particular air flow, from the inlet region 26 of the cover 24 to or through the outlet region 27 as needed.

[0096] The ventilation device 20 may have a sensing system including at least one air quality sensor. The air quality sensor is configured to monitor air, particularly continuously or at predetermined or determinable times and / or events, especially in the interior space of a vehicle and / or within a housing at least partially or partially formed by the cover 24, with the particular aim of detecting and determining pollutants.

[0097] Provided herein, the ventilation device 20 also has a control device configured to: assess the type and / or concentration of any pollutants that may be selectively determined by an air quality sensor, and to operate the fan device 23 when a critical pollutant type and / or pollutant concentration is reached and / or exceeded.

[0098] In the ventilation device 20 of the present invention Figures 8 to 12 In the exemplary embodiment schematically shown, when the cover 24 is connected to the frame member 22 of the pressure relief valve assembly 21, the fan device 23 is at least partially or partially received in the area defined by the cover 24 and the frame member 22.

[0099] In contrast, in the ventilation device 20 of the present invention... Figures 13 to 16 In the exemplary (third) embodiment schematically shown, the cover 24 is configured to receive the fan assembly 23 at least partially or partially, preferably in a removable or replaceable manner. For this purpose, the cover 24 has a receiving area that is at least partially or partially implemented in particular complementary to the outer contour of the fan assembly 23, in which the fan assembly 23 can be received.

[0100] Here, with the cover 24 connected to the frame member 22 of the pressure relief valve assembly 21, the fan device 23 is arranged on or in the inlet area 26 of the cover 24.

[0101] The present invention is not limited to the embodiments of ventilation devices 1 and 20 shown in the accompanying drawings, but is derived from an overview of all the features disclosed herein.

[0102] List of reference numerals 1. Ventilation equipment (first embodiment)

[0103] 2 First pressure relief valve assembly

[0104] 3. Frame-shaped component of the first pressure relief valve assembly

[0105] 4. Second pressure relief valve assembly

[0106] 5. Frame-shaped component of the second pressure relief valve assembly

[0107] 6. Steady Flow Zone

[0108] 7. Casing

[0109] 8. Entrance area of ​​the shell

[0110] 9. Exit area of ​​the casing

[0111] 10 Clamping Connection

[0112] 11 Check valve / shutting element 20 Ventilation equipment (second and third embodiments) 21 Pressure relief valve assembly

[0113] 22. Frame-shaped component of the pressure relief valve assembly

[0114] 23 Fan Unit

[0115] 24 Covers / Houses

[0116] 25 Clamping connection

[0117] 26. Entry area of ​​the cover

[0118] 27 Exit area of ​​the cover 30 Vehicle body components

Claims

1. A vehicle cabin ventilation device (20) having a pressure-limiting valve assembly (21) and a frame-shaped component (22) for laterally surrounding and / or fixing the pressure-limiting valve assembly (21) in a receiving opening of a vehicle body component (30), characterized in that the vehicle cabin ventilation device (20) has a fan arrangement (23) which is actuated or actuatable as required.

2. The ventilation device (20) as claimed in claim 1, wherein the ventilation device (20) has a cover (24) which at least partially or locally forms a housing, which cover is connected or connectable to the frame-shaped component (22) of the pressure-limiting valve assembly (21), preferably in a releasable or exchangeable manner, preferably by means of a form-fit connection, in particular a clamping connection (25), wherein in the connected state of the cover (24) with the frame-shaped component (22) of the pressure-limiting valve assembly (21), the cover at least partially or locally receives and positions and / or fixes the fan arrangement (23).

3. The ventilation device (20) as claimed in claim 2, wherein in the connected state of the cover (24) with the frame-shaped component (22) of the pressure-limiting valve assembly (21), the fan arrangement (23) is at least partially or locally received in a region delimited by the cover (24) and the frame-shaped component (22).

4. The ventilation device (20) as claimed in claim 2, wherein said cover member (24) is configured for at least partially or locally receiving said fan device (23), preferably in a releasable or exchangeable manner, wherein, the cover (24) in particular has a receiving region which is at least partially or locally configured complementary to an outer contour of the fan arrangement (23), in particular, the fan arrangement (23) can be received in the receiving region.

5. The ventilation device (20) as claimed in one of claims 2 to 4, wherein the cover (24) has an inlet region (26) on a first end side and an outlet region (27) on an opposite second end side, wherein the pressure-limiting valve assembly (21) is arranged or arrangeable on or in the outlet region (27) of the cover (24).

6. The ventilation device (20) as claimed in claims 4 and 5, wherein the fan arrangement (23) is arranged or arrangeable on or in the inlet region (26) of the cover (24).

7. The ventilation device (20) as claimed in one of claims 2 to 6, wherein the pressure-limiting valve assembly (21) has at least one non-return valve which is configured such that it allows a gas flow and in particular an air flow only from the inlet region (26) of the cover (24) to or through the outlet region (27).

8. The ventilation device (20) as claimed in claim 7, wherein the at least one non-return valve has at least one closing element (11), in particular in the form of a non-return valve flap, wherein the at least one closing element (11) is movable, in particular pivotable, between an open position and a closed position.

9. The ventilation device (20) as claimed in claim 8, wherein the at least one check valve is configured such that the at least one closing element (11) is pressed into a sealing seat associated with the at least one closing element (11) due to the force of gravity and / or the flow pressure of the gas flow and in particular air flow; or wherein the at least one check valve is configured as a spring-loaded check valve.

10. Ventilation device (20) according to one of claims 2 to 9, wherein the fan arrangement (23) is configured for causing a gas flow and in particular an air flow from the inlet region (26) of the cover (24) to or through the outlet region (27) as required.

11. Ventilation device (20) according to one of claims 1 to 10, wherein the fan arrangement (23) has at least one axial fan.

12. Ventilation device (20) according to one of claims 1 to 11, wherein the fan arrangement (23) is associated with an energy source, in particular independent of a power supply of the vehicle, for powering the fan arrangement (23) as required.

13. Ventilation device (20) according to one of claims 1 to 12, wherein the ventilation device (20) has or is associated with at least one sensor system, wherein the at least one sensor system has at least one air quality sensor configured to monitor the air, in particular continuously or at predetermined or pre-defined or definable times and / or events, in the vehicle cabin and / or in the housing (7) at least partially or locally formed by the cover (24), for the purpose of detecting and determining pollutants.

14. Ventilation device (20) according to claim 13, wherein the ventilation device (20) has or is associated with a control device configured to evaluate the type and / or concentration of any pollutants determined by the at least one air quality sensor and to operate the fan arrangement (23) when a critical pollutant type and / or pollutant concentration is reached and / or exceeded.

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