Air-conditioning unit for a vehicle interior and motor vehicle having such an air-conditioning unit

Abstract

An air-conditioning unit (1) for a vehicle interior (9) of a motor vehicle, said unit having: at least one inlet duct (5) through which fresh air can flow and which has at least one inlet opening (4); an air filter device (6) which is arranged downstream of the inlet duct (5); and a refrigerant circuit comprising at least one compressor, at least one evaporator, at least one condenser and at least one expansion valve, the at least one inlet opening (4) of the inlet duct (5) being arranged in a stagnation zone (2) on a front side of the motor vehicle, whereby the fresh air can be conveyed through the inlet opening (4) and through the inlet duct (5) during forward movement of the motor vehicle as a result of the dynamic pressure of the fresh air.

Description

[0001] Air conditioning system for the interior of a motor vehicle, as well as motor vehicle with air conditioning system

[0002] The invention relates to an air conditioning device for the interior of a motor vehicle, comprising at least one inlet channel through which fresh air can flow and which has an inlet opening, an air filter device arranged downstream of the inlet channel and a refrigerant circuit comprising at least one compressor, at least one evaporator, at least one condenser and at least one expansion valve, as well as a motor vehicle with an air conditioning device.

[0003] From DE 19629 084 C2 a fuel cell system as a drive battery for an electric vehicle is known, which includes at least a primary cooling system through which a liquid or gaseous cooling medium flows, in which the fuel cell system is designed such that the dynamic pressure of the driving wind drives the gaseous cooling medium wholly or partially into the cooling system.

[0004] The object of the invention is to provide a particularly space-saving air conditioning system and a motor vehicle with such an air conditioning system.

[0005] This problem is solved according to the invention by an air conditioning device with the features of claim 1 and by a motor vehicle with such an air conditioning device with the features of claim 10.

[0006] Advantageous embodiments or further developments of the invention are the subject of the dependent patent claims and the description.

[0007] A first aspect of the invention relates to an air conditioning device for the interior of a motor vehicle, comprising at least one inlet duct through which fresh air flows and which has at least one inlet opening, an air filter device arranged downstream of the at least one inlet duct, and a refrigerant circuit comprising at least one compressor, at least one evaporator, at least one condenser, and at least one expansion valve. The air conditioning device is characterized in that the at least one inlet opening of the at least one inlet duct is arranged in a congestion area at the front of the motor vehicle, whereby, when the motor vehicle is moving forward, the fresh air is drawn through the inlet opening and through the inlet duct by its dynamic pressure.

[0008] In other words, the fresh air that is to be supplied to the air conditioning system for regulating the vehicle interior should be able to be drawn from an area or area of ​​the front of the vehicle where the air stagnates and supplied to the air conditioning system, or be drawn from the air conditioning system during its operation and supplied to it.

[0009] This results in the advantage that the air conditioning unit's fan requires very little power to move fresh air through the intake duct, thus enabling particularly energy-efficient operation of the air conditioning unit. Due to the very low power requirement for the fan, it can be made much smaller, allowing the entire air conditioning unit to be designed in a particularly compact and space-saving manner.

[0010] When a motor vehicle is moving straight ahead, the air passing through it has a relative velocity with respect to the vehicle. In fluid mechanics, the component of a flow's total pressure due to its (relative) velocity is called dynamic pressure and is calculated as half the product of the medium's density and its squared velocity, where "medium" here refers to the air surrounding the vehicle. As the vehicle moves forward, the air flowing around it accumulates in a front area, the accumulation zone, for example, in the area of ​​the bumper.In this context, stagnation means that the air at the so-called stagnation point, which extends across the stagnation area, assumes the speed of the vehicle, meaning it no longer has a speed relative to the vehicle, thus converting the dynamic total pressure component into static pressure. At least one inlet opening of the at least one inlet channel is to be located in this stagnation area. This prevents the air from stagnating directly in the area of ​​the at least one inlet opening, allowing it to maintain its relative speed to the vehicle and flow through this inlet opening into the at least one inlet channel. In other words, the ambient air, due to the vehicle's relative speed to the ambient air, should be able to be supplied to the air conditioning system through the at least one inlet opening and through the at least one inlet channel.The arrangement of at least one inlet opening in the area of ​​congestion is particularly advantageous because this area can have surfaces perpendicular to the airflow velocity. The air flowing in here has not yet suffered any flow losses due to, for example, flow deflection, as air flowing around the vehicle along inclined surfaces does. Therefore, it has more energy or total pressure, resulting in a particularly high mass flow rate that can be supplied to the air conditioning system. "Fresh air" here refers to the air from the environment surrounding the vehicle. "At least one inlet channel having at least one inlet opening" here means that the air conditioning system has one or more inlet channels, each of which has one or more inlet openings. Therefore, in the following, only the inlet channel and the inlet opening will be referred to.

[0011] The dynamic pressure of the oncoming air increases quadratically with vehicle speed. At low vehicle speeds (ignoring wind speeds), the airflow may be assisted by a fan integrated into the air conditioning system. At higher vehicle speeds, this assistance may be reduced or eliminated entirely.

[0012] The refrigerant circuit and its components can be the refrigerant circuit commonly used in air conditioning systems known from the prior art. The at least one compressor is intended to compress and thus heat gaseous refrigerant, and the condenser is intended to liquefy the refrigerant, releasing heat to the environment. The evaporator is designed to evaporate the refrigerant, for example, after it has passed through an expansion valve for pressure reduction, absorbing heat. Preferably, heat is absorbed from fresh air or air from the vehicle interior, thereby cooling the air before it is directed into the vehicle interior. Additionally or alternatively to the refrigerant circuit, the air conditioning system can include at least one auxiliary heater, which heats the air before it is introduced into the vehicle interior.The at least one auxiliary heater can be electrically operated and / or absorb waste heat from the vehicle's internal combustion engine from the air introduced into the vehicle interior. Alternatively, the air conditioning system can be designed solely as a ventilation system, i.e., it can lack a refrigerant circuit and the components described therein. The invention also includes embodiments or further developments that offer additional advantages.

[0013] A further development of the air conditioning system stipulates that the air filter assembly is positioned above the intake opening, relative to the vehicle's vertical direction. In other words, the air filter assembly should be positioned higher than the intake opening and, in particular, the intake duct.

[0014] This has the advantage that, during maintenance or cleaning of the air filter system, any dirt that may or does come loose falls into the intake duct and does not contaminate any operationally important components of the air conditioning system, such as a blower, which would then distribute the dirt during operation within the air conditioning system.

[0015] The air filter assembly can be directly connected to the intake duct in the direction of airflow. This means that the air flowing into the intake duct through the intake opening passes through the air filter assembly downstream of the intake duct, or immediately downstream of it, so that it is cleaned of dirt particles by being filtered through the air filter assembly. Because the air filter assembly is located higher than the intake opening and, in particular, higher than the intake duct, the airflow passes through the air filter assembly "from below," i.e., against the force of gravity (provided the vehicle is on a level road). This has the advantage that dirt particles dislodged from the filter assembly by vibrations during driving, for example, fall downwards into the intake duct and can then escape into the surrounding environment.

[0016] A further development of the air conditioning system stipulates that a blower for drawing in fresh air is positioned above the air filter system, relative to the vehicle's vertical direction. In other words, the blower is to be positioned above the air filter system, i.e., relative to a gravity vector or position vector, it is positioned higher than the air filter system in the opposite direction.

[0017] This offers the advantage that the blower is not contaminated by dirt that comes loose during maintenance or cleaning of the air filter system, and therefore no dirt that falls into the blower is distributed throughout the air conditioning system by the blower when the system is in operation. The blower can be, for example, a single or double axial blower or a radial blower, also known as a centrifugal blower.

[0018] A further development of the air conditioning system provides that a fluidically flowable drain gap is formed around the inlet opening through the inlet channel, through which water and / or dirt can be discharged from the inlet channel against the flow direction of the fresh air in the inlet channel.

[0019] For example, during rain, water, i.e., rainwater, can be drawn into the inlet duct along with the fresh air. Preferably, the inlet duct can be curved upwards towards the air filter device. This allows the water drawn into the inlet duct with the fresh air to condense on the side of the duct wall facing the airflow due to centrifugal force. The condensate then flows downwards, i.e., towards the inlet opening, and is advantageously discharged or drained away via the drain gap by gravity. A particular advantage is that any dirt present in the inlet duct can be flushed out with the draining water.The drainage channel can be designed such that a wall of the inlet channel encompasses or encloses a wall of the inlet opening, which may be, for example, a round pipe or pipe section, in the area around the inlet opening, maintaining a distance between the inlet opening and the wall. The inlet opening, for example, a pipe section, can be held by struts, each of which may be positively, frictionally, and / or positively connected at one end to the wall of the inlet channel and at the other end to a wall encompassing the inlet opening. The struts can therefore extend across the drainage gap.

[0020] A further development of the air conditioning system provides that the inlet channel immediately downstream of the inlet opening is designed as a convergent divergent nozzle.

[0021] In other words, the cross-sectional area of ​​the inlet duct should decrease immediately downstream or behind the inlet opening in the direction of flow up to a constriction (convergent part of the nozzle) and increase downstream of the constriction in the direction of flow (divergent part of the nozzle). For this purpose, the wall of the inlet duct can narrow up to the constriction and widen immediately downstream in the direction of flow. This has the advantage that the fresh air can be dehumidified. In the convergent part of the nozzle, the static pressure and thus also the static temperature of the flow or fresh air decreases (Bernoulli's equation). This reduces the water-holding capacity of the fresh air, i.e., its ability to absorb water (i.e., humidity), which depends on its static temperature. Thus, water can be separated from the fresh air in the convergent part of the nozzle.In the section of the nozzle that widens or diverges immediately downstream of the constriction, the flow velocity of the fresh air is reduced again or decreased to a particularly optimal supply velocity for operating the air conditioning system. After separating from the fresh air, the water condenses on the side of the inlet channel wall facing the airflow and flows out through the drain gap. The condensed water can then be carried away by the airflow.

[0022] A further development of the invention provides that the air filter device has at least one drawer in which at least one air filter is arranged and which can be extended towards the vehicle interior along a first extension direction and thus removed from the air conditioning device.

[0023] This offers the advantage that at least one air filter can be replaced with significantly reduced effort. The air filter can be designed in the typical manner for air conditioning systems known from the prior art for motor vehicles. The drawer can have a handle projecting into the vehicle interior, by means of which the drawer can be pulled out of the air filter unit into the vehicle interior.

[0024] A further development of the invention provides that the drawer can be extended towards a front space along a second extension direction and thus removed from the air conditioning unit.

[0025] This offers the advantage that at least one filter of the air filtration system can be replaced with significantly less effort when the front compartment is open, because no dirt can fall from the air filter into the vehicle interior, which would then require cleaning. The front compartment refers to a cavity within the vehicle that is located in front of the windshield, as seen from the direction of travel.A further development of the air conditioning system provides that a fresh air flap is arranged in the inlet duct, through which a fresh air position can be selected, in which the inlet duct can be filled with fresh air, and through which a recirculation position can be selected, in which the inlet duct cannot be filled with fresh air, and that a housing part, at least partially limiting the inlet duct, is arranged in the vehicle interior and is designed to allow fluid flow from the vehicle interior, whereby air from the vehicle interior can be drawn in as recirculation by the air conditioning system through the housing part.

[0026] This offers the advantage that a recirculation function of the air conditioning system can be implemented in a particularly space-saving manner.

[0027] The housing part can be formed by the wall of the inlet duct and partially delimit the inlet duct, wherein the housing part is located in the vehicle interior, preferably in a footwell of the driver and / or a passenger. For example, the housing part can be designed to be air-permeable by means of perforations or a plurality of holes, allowing air from the vehicle interior to flow through the housing part into the inlet duct. For example, the air from the vehicle interior can be drawn in by the blower as recirculated air. In the recirculation position, the inlet duct can be closed off by the recirculation flap in such a way that no fresh air can flow through the air filter assembly.Alternatively, for a recirculation function, the fresh air flap can be designed so that it does not completely close the flow cross-section in the intake duct, but only narrows it, allowing less fresh air to flow to the air filter assembly than in the open position. In other words, in a recirculation position of the fresh air flap, the proportion of recirculated air—that is, air from the vehicle interior—that is supplied through the intake duct of the climate control system, via or through the air filter assembly, can be increased relative to the fresh air.

[0028] A further development of the air conditioning system provides for a bypass flap downstream of the air filter assembly. In the bypass position, this flap allows fresh air to be introduced into the vehicle interior immediately after passing through the air filter assembly via a bypass channel located downstream of the flap. This bypass channel is designed to allow airflow through the bypass channel. In other words, the fresh air should be able to flow directly or immediately after passing through the air filter assembly through the bypass channel and into the vehicle interior located downstream of the bypass channel, bypassing the blower, evaporator, and / or auxiliary heater of the air conditioning system.This requires, of course, that the fresh air flap is in a position where the intake duct is at least partially open to airflow, for example, in the fresh air position, and that the bypass flap is in the bypass position. In particular, it is provided that the blower, if present, is switched off when the bypass flap is in the bypass position. Thus, the fresh air preferably flows into the vehicle interior via the bypass duct after passing through the intake opening, the intake duct, and the air filter assembly, solely as a result of the vehicle's movement and its resulting kinetic energy. The bypass duct is preferably formed by a housing section that, when the blower is operating, is open to air flowing downstream of the blower.In other words, a flow-through area located immediately downstream of the blower is bypassed or shortened by the fresh air flow when the bypass damper is in the bypass position. If the air conditioning system does not have a blower, an area of ​​the air conditioning system in which the auxiliary heater or the evaporator is located can be bypassed by the bypass damper and the bypass duct, thereby reducing flow losses.

[0029] This offers the advantage that, above a certain vehicle speed (for example, determined by the design of the air conditioning system), a particularly large amount of fresh air can be drawn into the vehicle interior due to its kinetic energy. If the air conditioning system includes a fan, this fan can be switched off or remain switched off above the predetermined vehicle speed to supply fresh air to the vehicle interior, thus saving energy.

[0030] The bypass flap can be designed to assume an air conditioning position, thereby preventing the inflow of fresh air immediately downstream of the air filter device.

[0031] A second aspect of the invention relates to a motor vehicle with an air conditioning system according to the first aspect of the invention. Advantages and advantageous developments of the first aspect of the invention are to be considered as advantages and advantageous developments of the second aspect of the invention, and vice versa. Further features of the invention will become apparent from the claims, the figure, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown in the figure alone, are usable not only in the combinations specified, but also in other combinations or individually.

[0032] The invention will now be explained in more detail with reference to a preferred embodiment and the drawing. It shows:

[0033] Fig. a schematic sectional view of an imaginary section through an air conditioning unit arranged in a motor vehicle with an inlet duct and an inlet opening arranged in a storage area.

[0034] As shown in the figure, the air conditioning unit 1 can have an inlet duct 5 with an inlet opening 4, an air filter unit 6 with two air filters 7, and a blower 8, and can be arranged or installed in a motor vehicle. The inlet opening 4 can be located in a congestion area 2, for example, in the area of ​​a bumper or in the bumper of the motor vehicle. Fresh air can flow into the inlet duct 5 along the fresh air inflow direction 3. In this example, the motor vehicle with the air conditioning unit 1 is moving forward, and the influence of wind can be neglected. Due to the vehicle speed, the fresh air can be pushed or forced into the inlet duct 5 via the inlet opening 4, i.e., flow in. A convergent-divergent nozzle 15 can be arranged immediately downstream of the inlet opening 4.Along the fresh air inflow direction 3, the fresh air flowing through the inlet opening 4 into the inlet duct 5 can initially flow through a convergent section of the nozzle, i.e., a region of the inlet duct 5 with a cross-section that decreases along the flow direction, up to a constriction. Downstream of the constriction, i.e., in the divergent section, the flow cross-section of the inlet duct can increase again. In the convergent section, the incoming air can be accelerated, which, according to Bernoulli's equation, reduces the static pressure and temperature of the flow. A decrease in temperature reduces the fresh air's capacity to hold moisture, allowing moisture to condense from the fresh air. In this example, the fresh air flap 14, located upstream of the inlet opening 4 in the inlet duct 5, can, as shown in the figure...The air filter assembly 6 is shown in an open position, which can also be referred to as the fresh air position. The air filter assembly 6 can be arranged immediately downstream of the inlet duct 5 in the direction of airflow. The air filter assembly 6 can have a drawer in which, in this example, two air filters 7 can be arranged. With respect to a horizontal road surface or a horizontal road plane, the air filter assembly 6 can be arranged above the inlet opening 4 and / or above the inlet duct 5. The drawer of the air filter assembly 6 can be designed to be pulled out of the air conditioning unit 1 in a first and / or a second extension direction 11, 12 and to receive the air filters 7. The first extension direction 11 can, as indicated by the arrow in the figure, extend towards the vehicle interior 9.When the air filters 7 are dirty, the drawer can be pulled into the vehicle interior 9 in the direction of the first extension 11, and the dirty air filters can be replaced. Dirt that comes loose from the air filters 7 during this process falls advantageously into the intake duct 5. Additionally or alternatively, the drawer can be designed to be pulled out of the air conditioning unit 1 in a second extension direction 12 towards the front of the vehicle, indicated by the arrow in the figure for the second extension direction 12. The dirt that falls into the intake duct 5 when the air filters 7 are changed can, for example, fall or trickle out of the intake duct 5 through a drain gap 10 due to gravity.The drain gap 10 can be configured such that the inlet opening is formed as a first pipe section, which surrounds or encompasses the inlet opening 4 at a distance of, for example, 0.5 to 10 centimeters from a wall of the inlet channel 5, which is formed as a second pipe section directly around the inlet opening 4. The two pipe sections can be connected to each other across the drain gap 10 by struts, whereby the inlet opening 4 or the first pipe section can be held securely by the second pipe section or the inlet channel 5.Through the drainage gap 10, moisture or water brought into the inlet channel 5 with the fresh air, for example during rain, or water that may condense on a side of a curved wall of the inlet channel 5 facing the flow through the inlet channel, can drain away due to gravity, i.e. from the inlet channel via the drainage gap 10 out of the air conditioning unit 1, for example onto the road surface.

[0035] Above the air filter assembly 7, a blower 8 can be arranged, as shown in the figure. Due to the kinetic energy available to the fresh air flowing into the intake duct 5 when the vehicle is traveling straight ahead, the blower can be dimensioned to be particularly small, thus saving installation space. The air conditioning unit 1 can have a refrigerant circuit comprising at least one compressor, at least one evaporator, at least one condenser, and at least one expansion valve. Downstream of the blower 8 and downstream of the vehicle interior 9, an evaporator for cooling and / or an auxiliary heater for heating the air to be introduced into the vehicle interior 9 can be arranged, as is customary in air conditioning units for motor vehicles. To convey the conditioned air into the vehicle interior 9, an air outlet encompassed by the air conditioning unit 1 can be arranged in the vehicle interior 9.When the fresh air flap 14 is in the recirculation position, the flow cross-section of the inlet duct 5 can be reduced or completely closed compared to the open position of the fresh air flap 14, so that less or no fresh air can flow from the inlet opening 4 to the air filter assembly 7 compared to the open position. The inlet duct 5 can be bounded by a housing part 13 in an area that is formed in or towards the vehicle interior 9. The housing part 13 can, for example, be perforated or have a multitude of holes, i.e., recesses in the housing part 13, allowing air to flow through it towards or from the vehicle interior 9. The air flowing from the vehicle interior through the housing part 13 into the inlet duct 5 can be supplied to the air conditioning unit 1 as recirculated air.

[0036] In another example, the air conditioning unit 1 can be operated in a bypass mode. This requires that the inlet duct 5 is not completely closed by the fresh air flap 14 or that air can at least partially flow through it towards the air filter unit 6. Additionally, it may be necessary that a bypass flap 16 is in a bypass position, as shown in the figure, and that the vehicle is traveling straight ahead. In the bypass position, fresh air can flow into a bypass duct 17 directly downstream of the filter unit 6. The fresh air can then flow directly downstream of the air filter unit 6 via the bypass duct 17 into the vehicle interior 9.This prevents fresh air from flowing through and / or around other components or parts of the air conditioning system 1, such as an evaporator, auxiliary heater, and / or blower 8, thereby minimizing fresh air flow losses. To at least inhibit the flow of fresh air into the vehicle interior 9 through the housing part 13, a check valve 18 can be arranged in the inlet channel 5, preferably directly upstream of the air filter assembly 6, as shown in the figure. This blocks the flow path from the inlet channel 5 into the housing part 13, bypassing the air filter assembly 6.Above a predetermined vehicle speed, the kinetic energy of the fresh air may be sufficient to allow it to flow into the vehicle interior 9 immediately after passing through the air filter assembly 6, past the bypass flap 16, and via the bypass duct 17, without, for example, the assistance of the blower 8. The bypass flap 16 may be configured to assume a climate control position different from the bypass position, which may prevent the inflow of fresh air immediately downstream of the air filter assembly 6. If the bypass flap 16 is in the climate control position, fresh air and / or recirculated air can only be introduced into the vehicle interior 9 via a flow path through the blower 8, if present, and / or past or through an evaporator and / or auxiliary heater.

[0037] The following is a particularly favored example.

[0038] The idea behind this is that, within the framework of a project, a new air conditioning unit layout had to be developed based on the conceptual constraints and objectives (maximum interior space, very delicate cockpit). Standard layouts for air conditioning units, which can also be referred to as air conditioning system 1, are known to be located behind the bulkhead and / or platforms with components partially positioned in front of the bulkhead. The problem here is that an arrangement of an air intake, for example by a fan 8 via a hood gap, a filter, which can also be referred to as an air filter 7, and a fan 8, with the requirement of easy filter replacement, leads to the filter being positioned either above the fan 8 or as a pressure-side filter parallel to the evaporator.The basic principle of the idea is to draw fresh air from the area of ​​ram air pressure at the front end, direct it to the filter, and allow it to flow through the filter from bottom to top before being directed to a blower 8 located above it. This arrangement offers the following advantages: Symmetrical / LL / RL-compatible design (LL: left-hand drive, the steering wheel is on the left side in the direction of travel; RL: right-hand drive, the steering wheel is on the right side in the direction of travel). Any water introduced can drip off / escape by gravity. Dirt that is introduced does not fall into an air conditioning unit housing during filter changes. The filter can be changed either towards the engine compartment or front compartment, or towards the interior, which can also be referred to as the vehicle interior 9 (for example, depending on the specific model). The housing part 13 protruding into the vehicle interior 9 can be used as a recirculated air intake.

[0039] The following describes a layout for an air conditioner that arranges the components typically installed in such a unit in a way that offers numerous advantages. The layout is described along the air path. In the illustrated arrangement, fresh air is drawn from the bumper area, thus utilizing a ram air effect. The air, or fresh air, is fed to the filter via a shut-off valve, through which the air flows from bottom to top. Any water introduced can drip downwards and does not, as with most conventional filter arrangements, enter the air conditioner housing directly above the fan (8) and the subsequent air conditioner housing. This eliminates the need for the commonly used condensate drain hoses. Furthermore, no coarse dirt can fall into the fan housing when the filter is changed.The filter's low placement allows for filter changes both from the front, towards the engine compartment or front of the vehicle, and from the rear, towards the passenger compartment. Inside the vehicle, the cockpit can be designed so that no cockpit components need to be removed to change the filter. Due to the filter arrangement, which can also be referred to as the air filter assembly 7, the area of ​​the housing or housing part 13 located inside the vehicle can be used as an opening for the recirculated air intake.

[0040] Due to the goal of miniaturizing all components, a compensation method had to be found for the small-dimensioned blower 8. In current air conditioning systems, the stagnation pressure at the unit is not utilized, but rather compensated for by reducing the fresh air cross-section to maintain a constant air volume. In the case of an Eco operating mode (Eco: Economic, energy-saving) without an active refrigerant circuit, i.e., during pure ventilation, this is not efficient. Therefore, it is proposed that, in the case of pure interior ventilation, the stagnation pressure generated while the vehicle is in motion be utilized and the blower 8 and subsequent components be bypassed to achieve maximum airflow without electrical loads. A bypass damper 16 can be provided for this purpose, shortening the airflow to the interior and bypassing components that cause pressure losses.With the blower 8 switched on, air can be drawn in via a bypass air path 20 through an intake snorkel and an air filter. While driving, if necessary (pure ventilation function), the air can also be introduced into the vehicle interior via the bypass air path 20 through the bypass flap 16, driven solely by the ram pressure. The bypass flap 16 can be conveniently positioned either between the blower 8 and the evaporator, alternatively between the evaporator and the heat exchanger, or, as shown in the figure, after the evaporator and a heating component (heat exchanger, PTC auxiliary heater (PTC: Positive Temperature Coefficient), or similar), and thus directly into an air distribution box, where it can be distributed or introduced into the vehicle interior 9. As shown in the figure.As shown, this can be a pure ventilation unit (without a refrigeration circuit / evaporator), so that the maximum air volume can be made available for air distribution due to the low pressure loss. The dynamic pressure damper, which can also be referred to as a bypass damper 16, can be either actively operated or, as shown in the figure, as a passive damper. If dynamic pressure is not desired (for example, in winter), the damper or bypass damper 16 can be locked via a simple actuator, or, as shown in the figure, in the example shown, prevented from opening by another damper, here the stratification damper 19, or a partial opening can be selectively enabled.

[0041] List of reference symbols

[0042] Air conditioning unit Storage area

[0043] Fresh air inflow direction Inlet opening Inlet duct

[0044] Air filter system air filter

[0045] Blower, vehicle interior, drain gap, first extension direction, second extension direction, housing part, fresh air flap, convergent-divergent nozzle, bypass flap, bypass channel, check valve, stratification flap, bypass air path

Claims

Patent claims 1. Air conditioning device (1) for a vehicle interior (9) of a motor vehicle, with at least one inlet channel (5) through which fresh air can flow and which has at least one inlet opening (4), with an air filter device (6) arranged downstream of the at least one inlet channel (5) and with a refrigerant circuit comprising at least one compressor, at least one evaporator, at least one condenser and at least one expansion valve, characterized in that the at least one inlet opening (4) of the at least one inlet channel (5) is arranged in a storage area (2) at the front of a motor vehicle, whereby, when the motor vehicle is moving forward, the fresh air can be conveyed through the inlet opening (4) and through the inlet channel (5) by its dynamic pressure.

2. Air conditioning device (1) according to claim 1, characterized in that the air filter device (6) is arranged above the inlet opening (4) with respect to the vehicle's vertical direction.

3. Air conditioning device (1) according to claim 1 or 2, characterized in that a blower (8) of the air conditioning device (1) for drawing in fresh air is arranged above the air filter device (6) with respect to the vehicle's upward direction.

4. Air conditioning device (1) according to one of the preceding claims, characterized in that a fluidically flowable drain gap (10) is formed around the inlet opening (4) through the inlet channel (5), through which water and / or dirt can be discharged from the inlet channel (5) against a flow direction of the fresh air in the inlet channel (5).

5. Air conditioning device (1) according to one of the preceding claims, characterized in that the inlet channel (5) is designed as a convergent-divergent nozzle (15) immediately downstream of the inlet opening (4).

6. Air conditioning device (1) according to one of the preceding claims, characterized in that the air filter device (6) has at least one drawer in which at least one air filter (7) is arranged and which can be extended towards the vehicle interior (9) along a first extension direction (11) and thus removed from the air conditioning device (1).

7. Air conditioning device (1) according to claim 6, characterized in that the drawer can be extended in the direction of a front space along a second extension direction (12) and is thus removable from the air conditioning device (1).

8. Air conditioning device (1) according to one of the preceding claims, characterized in that a fresh air flap (14) is arranged in the inlet channel (5), through which a fresh air position can be selected in which fresh air can flow through the inlet channel (5) and through which a recirculation position can be selected in which fresh air cannot flow through the inlet channel (5), and a housing part (13) that at least partially limits the inlet channel (5) is arranged in the vehicle interior (9) and is designed to allow fluid flow from the vehicle interior (9), whereby air from the vehicle interior (9) can be drawn in as recirculated air by the air conditioning device (1) through the housing part (13).

9. Air conditioning device (1) according to one of the preceding claims, characterized in that a bypass flap (16) is arranged downstream of the air filter device (6), by means of which, in a bypass position of the bypass flap (16), fresh air can be introduced into the vehicle interior (9) via a bypass channel (17) arranged downstream of the bypass flap (16) and through which air can flow, as a result of the dynamic pressure of the fresh air immediately after it has passed through the air filter device.

10. Motor vehicle with an air conditioning device (1) according to any one of claims 1 to 9.

Images