FR3035192A1 - DEVICE FOR GENERATING AN AIR FLOW AND HEATING, VENTILATION AND / OR AIR CONDITIONING INSTALLATION - Google Patents

Abstract

The invention relates to a device for generating an air flow (1) comprising a main body (2) delimiting: a first air inlet (3a) of a first air circulation channel (3) for receiving a first vane wheel (5) for circulating an outside air flow and / or recycling (F1) in the first air circulation channel (3), a first air filter (11) being disposed on the first air inlet (3a), and - a second air inlet (4a) of a second air circulation channel (4) for receiving a second wing wheel (6) for circulating a recirculating air stream (F2) in the second air circulation channel (4). According to the invention, the device for generating an air flow (1) comprises at least one second air filter (10) disposed on the second air inlet (4a). The invention also relates to a heating, ventilation and / or air conditioning installation.

Description

The present invention relates to a device for generating an air flow, in particular for a heating, ventilation and / or air-conditioning system of an air-flow generating device. motor vehicle. A motor vehicle has a passenger compartment into which the air typically comes from a heating, ventilation and / or air conditioning device. The vehicle includes in particular one or more deicing nozzles located near the windshield, aerators located at the dashboard and intended to deliver air to the driver and the passenger, and nozzles located at the level of the feet driver and passenger (foot nozzles). The heating, ventilation and / or air conditioning device, also called HVAC (for Heating, Ventilation and Air-Conditioning in English) can be supplied with either air outside the vehicle (also called fresh air), or air recycle, it that is to say from the passenger compartment of the vehicle. Outside air is generally low in moisture when it is cold compared to recirculating air, but can be relatively cold, especially in winter conditions. The recirculation air generally has a humidity level higher than the outside air, and is at a temperature close to the temperature to be reached, that is to say close to the set temperature defined for example by the driver or the passenger. Depending on the operating conditions, it may therefore be particularly advantageous to use outside air to introduce it into the cabin at the defrosting nozzles located near the windshield, after heating through the aforementioned device by example. As the humidity level of the fresh air is relatively low, the risk of generating fogging on the windshield is therefore also low. Conversely, it may be advantageous to use recirculation air to reject it in the passenger compartment at the foot nozzles. In this way, even in winter conditions and when a large air flow is requested by the driver or the passenger, it is possible to heat up this recirculation air more quickly to the set temperature before it is rejected in the winter. the cockpit. The comfort for the users is greatly improved and the risk of generating fog on the windshield is low, this recycling air being rejected away from the windshield. In order to take advantage of such advantages, it is important to be able to dissociate the air flows (outside air - recycling air), in particular during the passage of said air flows 5 through the heating, ventilation and / or air conditioning device. . A heating, ventilation and / or air conditioning device conventionally comprises a single air circulation channel equipped with a finned wheel driven in rotation by an electric motor in order to pulsate the air in the air circulation channel. In order to guarantee the separation between the air flows while being able to select or better adjust the type of air to be delivered, so-called "double flow" installations are known in which the cabin air at higher temperatures is blown through the foot nozzles and the outside air with a lower moisture content is blown through the defrosting nozzles. However, the air in the passenger compartment can be loaded with dust that is sucked up by the installation and then thrown back into the passenger compartment. This can foul the heat exchangers and the installation itself and help maintain a high level of dust in the cabin. One of the aims of the present invention is to at least partially overcome the problems of the prior art.

To this end, the subject of the invention is a device for generating an air flow comprising a main body delimiting: a first air inlet of a first air circulation channel intended to receive a first wheel finned for circulating a flow of outside air and / or recirculation in the first airflow channel, a first air filter being disposed on the first air inlet, and a second air inlet a second airflow channel for receiving a second finned wheel for circulating a flow of recirculating air into the second airflow channel, characterized in that the device for generating a air flow comprises at least a second air filter disposed on the second air inlet. The first airflow channel may supply, for example, defrosting nozzles located near the windshield and the second airflow channel may supply foot nozzles. Depending on the position of the movable member, it is possible to select or adjust the amount of outside air or recirculating air in the first air circulation channel or in the second circulation channel. air and / or in the third air circulation channel.

In addition, the recirculation air from the passenger compartment to the passenger compartment is also filtered. According to one or more characteristics of the device for generating an air flow taken alone or in combination, a movable member is arranged downstream of the first air inlet and the second air inlet and whose position allows to modify the proportion of the outside air flow and / or recycling and the recirculating air flow downstream of the movable member in the first and the second air circulation channel and / or in a third channel of air flow of the device for generating an air flow, 15 - the second air filter comprises a filter body of generally annular shape, - the second air filter comprises a cover arranged on the filter body to close the axial end of the filter body, the second air filter comprises a support provided with a fixing device cooperating with the main body to fix the second air filter on the second air inlet, for example, by a bayonet type fitting. the second air filter comprises an accordion folded filter body, the first air inlet and the second air inlet are located on the opposite faces of the main body, and said movable member can be moved between a position of opening of the first and second air circulation channels and a closure position in which said movable member closes the first air circulation channel or the second air circulation channel and / or any intermediate position located between said open position and said closed position. The first airflow channel may supply, for example, defrost nozzles 30 located near the windshield and the second airflow channel may supply foot nozzles. Depending on the position of the movable member, it is possible to select or adjust the amount of outside air or recirculating air in the first air circulation channel or in the second circulation channel 3035192 4 of air, the device for generating an air flow comprises a third air circulation channel and said movable member can be moved between: a first position in which said movable member blocks access to the flow recycling air at the third air circulation channel, o a second position in which said movable member blocks the access of the outside air flow and / or recycling to the third air circulation channel. Outside air or recirculation air may flow into the third airflow channel 10 depending on the position of the movable member. the first air filter and the second air filter have different filtration properties. The invention also relates to a heating, ventilation and / or air conditioning system characterized in that it comprises a device for generating an air flow as defined above. Other advantages and features will appear on reading the description of the invention, as well as the appended drawings in which: FIG. 1 is a diagrammatic front view of a first exemplary embodiment of a generating device; a flow of air with the movable member in the open position, - Figure 2 is a view corresponding to Figure 1, illustrating a closed position of the movable member, - Figure 3 is a view in perspective of a device for generating an air flow, FIG. 4 is a bottom view of the recycling air filter of the device for generating an air flow of FIG. 3; FIG. 5 is a schematic front view of a second exemplary embodiment of a device for generating an air flow in a first position of the movable member, and FIG. 6 is a view corresponding to FIG. Figure 5, illustrating a second position of the movable member.

In these figures, the identical elements bear the same reference numerals. The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments may also be combined to provide other embodiments. The upstream / downstream directions are designated with reference to the direction of flow of air in the device for generating an air flow. Figures 1 to 4 show a first example of a device for generating an air flow 1 for a heating system, ventilation and / or air conditioning of a motor vehicle.

The device for generating an air flow 1 comprises a main body 2 delimiting a first air circulation channel 3 and a second air circulation channel 4. The first air circulation channel 3 comprises a first air inlet 3a, allowing the entry of an outside air flow and / or recycling within the vehicle. The first air inlet 3a includes a shutter, not shown, for regulating the ratio of outside air flow rates and recycling. The second air circulation channel 4 comprises a second air inlet 4a, distinct from the first air inlet 3a, allowing the entry of a recycling air stream exclusively, the recycling air stream. originating from the passenger compartment of the automobile vehicle. The device for generating an air flow 1 comprises means able to pulsate the air. These means comprise a first impeller 5 mounted in the first air circulation channel 3 downstream of the first air inlet 3a and capable of generating an outside air flow and / or recycling F1 and a second wheel vane 6 mounted in the second air circulation channel 4 downstream of the second air inlet 4a and adapted to generate a recirculating air flow F2, these two finned wheels 5, 6 being drivable in rotation by the same electric motor, not shown.

The two air circulation channels 3, 4 are separated from each other by a partition wall 7, downstream of the finned wheels 5, 6 in the direction of air flow. According to a non-illustrated embodiment, the partition wall 7 is continuous 5 so as to dissociate the two air circulation channels 3,4. It is appropriate in this case that the first air inlet 3a comprises an external air intake and recirculation with a control flap to vary the respective air flow rates. Indeed, it is necessary for the first air inlet 3a to have an outside air intake and a recirculating air inlet to have an operating mode with a maximum recirculating air flow flowing in both channels. air circulation 3 and 4, such as in summer with high ventilation. According to the exemplary embodiment illustrated in FIGS. 1 and 2, the partition wall 7 is discontinuous and comprises an opening 8 allowing the passage of air between the two air circulation channels 3, 4. A movable member 9, such that a flap, substantially plane (FIG. 1) or drum, is pivotally mounted on the partition wall 7 at the opening 8. The movable member 9, arranged downstream of the first and second air inlets 3a, 4a, and downstream of the finned wheels 5, 6 can be arranged upstream of a heat exchanger, for example an evaporator. The position of the movable member 9 makes it possible to modify the proportion of the outside air flow and recycling downstream of the movable member 9. The movable member 9 can be moved between an open position of the circulation channels air 3, 4 (Figure 1) and a closed position (Figure 2) wherein said movable member 9 closes the first air channel 3 or the second air channel 4 (Figure 2) and / or any intermediate position between said open position and said closed position. In this case, the first air inlet 3a may, for example, comprise only an outside air inlet only since the movable member 9 is able to guarantee a maximum circulation of air circulation by circulating the flow F2 recirculation air in both circulation channels 3,4.

In the closed position, the movable member 9 can allow the passage of air from the channel which is not closed towards the part of the closed channel which is located downstream of the movable member 9.

In this case, the first and second air circulation ducts 3, 4 are separated by the partition wall 7, at least in their parts located downstream of the movable member 9. The partition wall 7 carrying the opening 8 allows the passage of air between the two channels 3, 4.

The opening 8 is closed by the movable member 9 in the open position thereof (Figure 1), the opening is opened by the movable member 9 in the closed position (Figure 2). In the open position, the movable member 9 formed by a substantially flat flap extends in the plane of the partition wall 7, closing the opening 8. The movable member 10 9 does not oppose the passage of the air in the two air circulation channels 3, 4. In its closed position, the movable member 9 closes all or part of one of the channels 3, 4 (in particular the second circulation channel of air 4 in Figure 2), by releasing or opening the opening 8. In this position, the flow of outside air and / or recycling F1 can flow in the first and second air flow channels 3, 4, 15 in this position also, the recirculation air flow F2 is blocked by the movable member 9 and does not open or little in the area of the second downstream air circulation channel 4 of the movable member 9. The device for generating an air flow 1 further comprises a second air filter 10 disposed on the second air inlet 4a and a second first air filter 11 disposed on the first air inlet 3a. It is possible to use the first and second air filters 10, 11 with different filtration properties. Indeed, the first air filter 11 treating, among other things, an outside air flow, is mainly used to capture odors, a filter comprising activated carbon is therefore preferred. The second air filter 10 treats a stream of recirculating air and must above all retain dust and other allergens often present in the passenger compartment of the vehicle, a filter with nonwoven fibers is preferred. Of course, it is possible to arrange air filters combining these two filtration properties with the first and second air inlets 3a, 4a. The first and second air inlets 3a, 4a are for example located on the opposite faces of the main body 2, for example being situated laterally to the main direction of the air circulation channels 3, 4. Better visible on the 4, the second air filter 10 comprises for example a filter body 12 of generally annular or cylindrical shape, the outer diameter dimension of which corresponds at least to the diameter of the second air inlet 4a. The filter body 12 thus has maximum dimensions in the available space. In addition, the filter body 12 comprises, for example, an accordion folded sheet, which makes it possible to increase the filtering surface in the same space. The filter body 12 is for example a pollen filter and / or an antiallergenic filter. In another example, the filter body 12 comprises activated carbon. The second air filter 10 may also comprise a cover 13 arranged on the cylindrical filter body 12 to close the axial end of the filter body 12 and thus force the flow of recirculation air F2 to pass through the filter body 12 The cover 13 is for example molded on the filter body 12. According to an exemplary embodiment, the second air filter 10 comprises a support (not shown) provided with a fixing device cooperating with the main body 2 to fix the second air filter 10 on the second air inlet 4a by a bayonet type mounting. In the second exemplary embodiment shown in FIGS. 5 and 6, the device for generating an air flow 1 differs from the first embodiment in that the position of the movable member 9 makes it possible to modify the proportion external air flow and recycling in a third air circulation channel 23 of the device for generating an air flow 1. More specifically, the main body 2 of the device for generating a flow of air air 1 comprises a first partition wall 20 in an area upstream of the movable member 9, a second and a third partition wall 21, 22, located downstream of the movable member 9.

The second and third partition walls 21, 22 delimit between them a third air circulation channel 23. The portion 3b of the first air circulation channel 3 located downstream of the movable member 9 is delimited by the third separation wall 22 and the main body 2. The portion 4b of the second air circulation channel 4 located downstream of the movable member 9 is delimited by the second partition wall 21 and the main body 2. The body 9 can be moved between: a first position, illustrated in Figure 5, wherein the movable member 9 blocks the access of the recirculation air flow F2 to the third air circulation channel 23. recirculation air F2 is directed into the portion 4b of the second air circulation channel 4 located downstream of the movable member 9. The outside air flow and / or recycling F1 is directed into the third channel of air circulation 23 and in the portion 3b of the first channel of circ 5 - a second position, illustrated in Figure 6, wherein the movable member 9 blocks the access of the outside air flow and / or recycling F1 at the third air circulation channel 23. The outside air flow and / or recycling F1 is directed into the portion 3b of the first air circulation channel 3 located downstream of the movable member 9. The flow recirculation air F2 is directed into the third air circulation channel 23 and into the portion 4b of the second air circulation channel 4 located downstream of the movable member 9. Thus, in the first position, the movable member 9 extends between the downstream end of the first partition wall 20 and the upstream end of the second partition wall 21. In the second position, the movable member 9 extends between the end downstream of the first partition wall 20 and the upstream end of the third partition wall 22. It is defined by: - S1, the of the first air circulation channel 3, downstream of the finned wheel 5, - S2, the minimum section of the second air circulation channel 4, downstream of the finned wheel 6, - S3, the minimum section of the third air circulation channel 23, downstream of the finned wheels 5, 6.

The relations between these different sections are as follows: S1 = a.S2 and S1 = b.S3 where a is between 1 and 2, b being between 1 and 3. The sections are advantageously adapted to have a distribution of flows of air which varies from 65% to 35% for the outside air flow and / or recycling F1 and 35% to 65% for the recirculation airflow F2. It is thus possible to control the ratio between the flow of outside air and / or recycling F1 to the vehicle and the flow of recirculation air F2 from the passenger compartment, depending on the position of the movable member 9 .

Claims (11)

REVENDICATIONS1. Device for generating an air flow (1) comprising a main body (2) delimiting: a first air inlet (3a) of a first air circulation channel (3) intended to receive a first wheel vane (5) for circulating an outside air flow and / or recycling (F1) in the first air circulation channel (3), a first air filter (11) being arranged on the first inlet an air inlet (3a), and a second air inlet (4a) of a second air circulation channel (4) for receiving a second vane wheel (6) for circulating an air flow of recycling (F2) in the second air circulation channel (4), characterized in that the device for generating an air flow (1) comprises at least one second air filter (10) disposed on the second air inlet (4a). 2. Device for generating an air flow (1) according to the preceding claim, characterized in that a movable member (9) is arranged downstream of the first air inlet (3a) and the second inlet of air (4a) and whose position makes it possible to modify the proportion of the outside air flow and / or recycling (F1) and the recirculation air flow (F2) downstream of the movable member (9) in the first and the second air circulation channel (3, 4) and / or in a third air circulation channel (23) of the air flow generating device (1). 3. Device for generating an air flow (1) according to one of the preceding claims, characterized in that the second air filter (10) comprises a filter body of generally annular shape. 4. Apparatus for generating an air flow (1) according to the preceding claim, characterized in that the second air filter (10) comprises a cover (13) arranged on the filter body (12) to close the door. axial end of the filter body (12). 5. Device for generating an air flow (1) according to one of the preceding claims, characterized in that the second air filter (10) comprises a support provided with a fixing device cooperating with the body main (2) for fixing the second air filter (10) on the second air inlet (4a). 6. Device for generating an air flow (1) according to one of the preceding claims, characterized in that the second air filter (10) comprises a filter body (12) folded accordion. 7. Device for generating an air flow (1) according to one of the preceding claims, characterized in that the first air inlet (3a) and the second air inlet (4a) are located on the opposite faces of the main body (2). 5 8. Device for generating an air flow (1) according to one of claims 2 to 7, characterized in that said movable member (9) can be moved between an open position of the first and second channels of air circulation (3, 4) and a closed position in which said movable member (9) closes the first air circulation channel (3) or the second air circulation channel (4) and / or any intermediate position 10 located between said open position and said closed position. 9. Device for generating an air flow (1) according to one of claims 1 to 7, characterized in that the device for generating an air flow (1) comprises a third circulation channel. (23) and in that said movable member (9) can be moved between: a first position in which said movable member (9) blocks the access of the recirculating air stream (F2) to the third channel; air circulation device (23), - a second position in which said movable member (9) blocks access of the outside air flow and / or recycling (F1) to the third air circulation channel (23) . 20 Device for generating an air flow (1) according to one of the preceding claims, characterized in that the first air filter (11) and the second air filter (10) have different filtration. 11. Heating, ventilation and / or air conditioning system characterized in that it comprises a device for generating an air flow (1) according to one of the preceding claims.