FR3034047A1 - DEVICE FOR HEATING, VENTILATION AND / OR AIR CONDITIONING FOR A MOTOR VEHICLE - Google Patents

Abstract

Device (2) for heating, ventilation and / or air conditioning for a motor vehicle, comprising: - a first heat exchanger (6), - a channel (3) for the flow of an air flow where the first exchanger is arranged of heat (6), - a first bypass (16) of the first heat exchanger (6), - a first flap (18) and a second flap (28) at least partially obstructing the flow channel (3) air flow, said flaps (18, 28) being located near the first heat exchanger (6). According to the invention, the first flap (18) is of sliding type while the second flap (28) is of a different type of the first flap (18).

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to the field of heating, ventilation and / or air conditioning devices for a motor vehicle.

STATE OF THE PRIOR ART A motor vehicle is commonly equipped with a ventilation, heating and / or air conditioning device for regulating the aerothermal parameters of an air flow distributed towards the interior of the passenger compartment of the vehicle. The device generally comprises a housing delimited by partitions in which openings are provided, including at least one air inlet and at least one air outlet. In known manner, the housing houses a blower to circulate the air flow from the air inlet to the air outlet. The housing also houses heat treatment means for heating and / or cooling the air flow prior to its distribution inside the passenger compartment. By way of example, the heat treatment means may comprise an evaporator which is intended to cool and dehumidify the flow of air passing through it, as well as a radiator, possibly associated with an additional radiator, which is intended to heat the flow of air passing through it.

It is known in these devices to have an evaporator disposed downstream of the air inlet, so that all of the air flow entering the interior of the housing is dehumidified by the evaporator. Then, the cold air stream thus generated is admitted into a main mixing chamber and / or directed towards a heating element, in particular a radiator and optionally an additional radiator, to obtain a flow of hot air. The main mixing chamber is used to mix one or more cold and / or hot air streams so that the air flow from the mixture, having the desired set temperature, is distributed to specific areas of the passenger compartment of the vehicle. motor vehicle. The main mixing chamber is provided with a first mixing device to define the proportion of the cold air flow and the hot air flow from the heating chamber entering the main mixing chamber. This member thus makes it possible to adjust the temperature of the mixed air flow intended to be distributed in the dedicated zone (s) of the passenger compartment, such as, for example, the front and rear zones. However, it is also desirable to provide a possibility of thermally managing the different areas of the vehicle independently, especially for high-end vehicles. To do this, the housing also houses a secondary mixing chamber for generating a secondary air flow to ventilate one or more other areas of the passenger compartment. The secondary mixing chamber is also in aeraulic communication with the heating element and able to receive all or part of the air flow having passed through the evaporator of the heating, ventilation and / or air conditioning device. The secondary mixing chamber is equipped with a second mixing device to define the proportion of the cold air flow and the hot air flow entering the secondary mixing chamber 15 to adjust the temperature of the distributed air flow. in other areas of the vehicle. Although such a heating, ventilation and / or air conditioning device makes it possible to carry out independent air-conditioning management for several areas of the vehicle, it nevertheless turns out that such a device requires two distribution members which increases the volume of the device. and requires a more complex kinematics. SUMMARY OF THE INVENTION The present invention aims at optimizing the steric bulk of a heating, ventilation and / or air conditioning device while having a simple kinematics as part of a heat treatment for several areas of the vehicle. For this purpose, the invention proposes a heating, ventilation and / or air-conditioning device for a motor vehicle, comprising: a first heat exchanger; a flow channel of an air flow where the first exchanger is arranged; of heat, - a first bypass of the first heat exchanger, 3034047 3 - a first flap and a second flap at least partially obstructing the flow channel of the air flow, said flaps being located near the first heat exchanger heat.

According to the invention, the first component is of the sliding type while the second component is of a type different from the first component. In this way, the invention makes it possible to have a heating, ventilation and / or air conditioning device that is less cumbersome than those of the prior art. By using a second shutter of a type other than the first sliding shutter, this ensures a linkage kinematics of the two flaps within the heating device, ventilation and / or simple air conditioning while ensuring a saving of space. There is thus a synergy in the use of these two components which makes it possible to make an advantageous compromise between the steric genes and the kinematics of the device.

Particular embodiments according to the invention propose that: said first and second flaps are arranged upstream, with respect to the flow direction of the air flow, of the first heat exchanger; A second heat exchanger is arranged upstream, with respect to the direction of flow of the air flow, of the first heat exchanger; the first component comprises a gear in interaction with at least one rack; the second flap is of the drum type; The device comprises a second bypass path of the first heat exchanger, the second bypass path being arranged at a distance from the first bypass path; the first flap is disposed at the first bypass path and the second flap is disposed at the second bypass path; - The device comprises a separating element arranged between said bypass paths of the first heat exchanger, comprising receiving means adapted to receive the first flap and the second flap; Said heat exchangers are arranged substantially parallel; - The said bypass paths are arranged on either side of the first heat exchanger.

BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures, which illustrate: FIG. 1 illustrates a profile view of the heating and ventilation device and / or air conditioning according to the invention; - Figure 2 illustrates a side view of the heating, ventilation and / or air conditioning device according to the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS To obtain a heating, ventilation and / or air conditioning device with a small steric bulk while having a simple kinematics, in the context of a heat treatment for several zones of the vehicle, the invention such as 1, proposes a device 2 for heating, ventilation and / or air conditioning comprising a housing 4 defining a flow channel 3 of an air flow in which heat treatment means of the air flow are housed intended to be distributed in the cockpit.

The heat treatment means comprise a first heat exchanger 6, for example a radiator, for heating a portion of the air flow circulating in the heating, ventilation and / or air conditioning device 2. The first heat exchanger 6 may optionally be coupled to an additional electric heater 7 for heating the airflow more rapidly, especially in the case of a vehicle start. The heat treatment means also comprise a second heat exchanger 8, for example an evaporator, arranged upstream with respect to the flow direction of the air flow of the first heat exchanger 6. The second heat exchanger 3034047 5 8 is intended to cool and dehumidify the entire flow of air flowing in the heater. The flow of air is introduced into the casing 4 via an inlet (not shown) and is then directed towards an outlet, after being heat-treated by the heat exchangers 6, 7, 8, via a blower (not shown) The outlet comprises several ducts distributing the air flows to nozzles opening into the passenger compartment including the conduit 10 leading the air flow for the defrosting nozzle to demist the windshield, the duct 12 leading the flow of air. air to the side / central ventilation nozzle for cooling / heating the passengers of the vehicle, as well as the duct 14 10 directing the air flow to the foot nozzle for heating the feet of the front passengers of the vehicle. In order to be able to distribute the air flows towards the nozzles at the desired temperatures, the heating, ventilation and air-conditioning device 2 comprises a first mixing zone 15 where a hot air flow and a cold air flow, coming respectively from the heat exchangers 6 and 8, are mixed in variable proportions and then routed to the nozzles opening into the passenger compartment. To ensure that the flow of cold air from the second heat exchanger 8 is not thermally contaminated by the first heat exchanger 6, the device 2 comprises a first bypass path 16 of the first heat exchanger 6. the flow of cold air, having passed through the second heat exchanger 8, circulates either through the first heat exchanger 6 to be heated, or bypasses the first heat exchanger 6 by the first bypass path 16 to maintain its temperature . Both hot and cold air streams are directed to the first mixing zone 15 to be mixed and dispensed to the outlet nozzles at the recorded temperatures. To achieve this mixture in variable proportions, the device 2 comprises a first flap 18 for regulating the proportion of cold air flow passing through the first heat exchanger 6 and the proportion of cold air flow passing through the first path The first flap 18 is of the sliding type and comprises a door 21 on which is arranged a rack. In order to put the first flap 18 in motion, a gear 20 complementary to the rack is rotated about an axis A 3034047 6 by an actuator not shown. The rotation of the gear causes the translational movement of the door 21 between two extreme positions, a position where the first flap 18 blocks the access of the cold air flow to the first bypass path 16 and a position where the first flap blocks the access of the cold air flow to the first heat exchanger 6. The access of the cold air flow to the first heat exchanger 6 is achieved via a corridor 19 corresponding to a portion of the channel 3 for the flow of an air flow located between the separating element 30, which will be described later, and the first heat exchanger 6.

According to the positioning of the first flap 18, the cold air flow from the second heat exchanger 8 is oriented in variable proportions towards the first heat exchanger 6 and / or directly to the first mixing zone 15. the configuration as illustrated in Figure 1, the cold air flow is directly and integrally directed to the first mixing zone 15 and then to the ducts 10, 15 12, 14 output. Such a device is suitable for a homogeneous heat treatment where the different areas of the vehicle are ventilated at the same temperature.

However, if it is desired to have a temperature difference between two zones of the vehicle, for example the front and the rear of the passenger compartment, it is necessary to add a second mixing zone 22. The second mixing zone 22, analogously to the first mixing zone 15, allows the hot and cold air flows, respectively from the heat exchangers 6 and 8, to be mixed in variable proportions and then conveyed to at least one nozzle opening into the appropriate area of the passenger compartment via a duct 24. As for the first mixing zone 15, to ensure that the cold air flow coming from the second heat exchanger 8, is not thermally contaminated by The first heat exchanger 6, said device 2 comprises a second bypass path 26 of the first heat exchanger 6, the second bypass path 26 being arranged at a distance from the first bypass path 16. Thus, the cold air flow, having passed through the second heat exchanger 8, circulates either through the first heat exchanger 6 to be heated or bypasses the first heat exchanger 6 by the second bypass path 26 to maintain its temperature low. Both hot and cold air streams are directed to the second mixing zone 22 to be mixed and distributed to the outlet nozzles of the appropriate vehicle area at the recorded temperatures. To achieve this mixture in variable proportions, the device 2 comprises a second flap 28 for regulating the proportion of cold air flow passing through the first heat exchanger 6 and the proportion of cold air flow passing through the second path bypass 26.

The second flap 28 is of a different type than the first flap 18. As illustrated in the embodiment of FIG. 1, the second flap 28 corresponds to a drum flap. Of course, any other type of flap such as a flag or butterfly flap is suitable for implementing the device 2 according to the invention.

In order to put the second flap 28 in motion, a non-illustrated actuator rotates the second flap 28 around an axis B between two extreme positions, a position where the second flap 28 blocks access to the cold air flow. at the second bypass path 26 and a position where the second flap blocks access of the cold air flow to the first heat exchanger 6. Here also the access of the cold air flow 20 to the first heat exchanger is realized by via a passage 29 corresponding to another portion of the flow channel 3 of an air flow located between the separating element 30, which will be described later, and the first heat exchanger 6.

Depending on the positioning of the second flap 28, the flow of cold air from the second heat exchanger 8 is oriented, in variable proportions, towards the first heat exchanger 6 and / or directly to the second mixing zone 22. According to the configuration as illustrated in Figure 1, the cold air flow is mainly directed to the first heat exchanger 6 and then to the second mixing zone 22 and in the minor direction directly to the second mixing zone 22. Such as 1, said first and second flaps 18, 28 are arranged upstream, with respect to the direction of flow of the air flow, of the first heat exchanger 6, and downstream of the second heat exchanger. heat 8. It is possible, according to an embodiment not shown, 3034047 8 to arrange the first and second flaps 18,28 downstream of the first heat exchanger 6. Such a device is suitable for a multiz heat treatment one where different 5 areas of the vehicle can be ventilated at different temperatures. A passenger can control a set temperature for the flow of air from the first mixing zone 15, and another passenger can control a different setpoint temperature for the air flow from the second mixing zone 22.

In order to guarantee the dependence or the independence of the two mixing chambers 15, 22, a shutter 32 is arranged between the two mixing chambers 15, 22, thus being able to join them together or to isolate one from the other. Typically, it is advantageous for a heating, ventilation and / or air conditioning device operating in a three-four zone mode to have two independent mixing chambers 15, 22.

While for a one-two-zone or dual-layer mode, it is more advantageous to have the mixing chambers 15, 22 dependent. Of course, the flap 32 isolates the two mixing chambers 15, 22 by adopting an extreme position called "closed", as shown in Figure 2, and combines the two chambers by adopting an extreme position called "open".

Although a sliding-type shutter requires little space, the kinematics required to move the gear 20 and the gate 21 is complex and particularly expensive. Similarly, although a drum type flap has a simple kinematics, this type of flap occupies a large volume. The device 2 for heating, ventilation and / or air conditioning according to the invention therefore makes it possible to have air conditioning adapted for multi-zone operation with steric bulk and kinematics acceptable at a lower cost. As seen above, the device 2 for heating, ventilation and / or air conditioning 30 according to the invention, and as shown in Figure 2, comprises two mixing zones 15, 22, each being able to receive a flow of air having passed through the first heat exchanger 6. To ensure that each mixing zone 15, 22 receives the appropriate amount of hot air flow, the device 2 comprises a separating element 30 for separating the flow of air from the second The separating element 30 as shown in FIG. 2 corresponds to a set of walls, each of which is intended to be oriented towards a specific mixing zone 15, 22. interconnected thereby forming a hollow polygon. However, a single wall is sufficient to fulfill this function.

The separating element 30 comprises receiving means adapted to receive the first and second flaps 18, 28. These receiving means here correspond to a curved wall against which the first flap 18 comes to rest and a flat wall against which the second component 28 can come to support. Of course, it is possible to envisage other reception means such as an abutment overmolded on a flat wall for example. The separating element 30 separates the air flow coming from the second heat exchanger 8 into two air streams. Each air flow has the possibility of crossing a portion 15 of the first heat exchanger 6 via the corridors 19, 29 and / or a bypass path 16, 26 to reach the respective mixing chamber 15, 22, in the appropriate proportions to guarantee the respective setpoint temperatures.

It should be understood, however, that these exemplary embodiments are given by way of illustration of the object of the invention. The invention is not limited to these embodiments described above and provided solely by way of example. It encompasses various modifications, alternative forms and other variants that may be considered by those skilled in the art within the context of the present invention and in particular any combination of the various embodiments described above. In particular, the device 2 for heating, ventilation and / or air conditioning according to the invention may comprise flaps arranged in the ducts 10, 12, 14 for blocking the access of the air flows to the various nozzles opening into the chamber. cockpit. The device 2 may also include a system for evacuating the condensates generated at the evaporator, or a particle filter upstream of the second heat exchanger 8, or a bypass path of the second heat exchanger 8, according to embodiments not illustrated.

The separating element 30 is arranged upstream of the first heat exchanger 6 and is located between the ends of the first heat exchanger 6, it can for example be located in the middle of the height of the first heat exchanger 6 so the section of the corridor 19 is equal to that of the corridor 29. The separation element 5 can also be located so that the section of the corridor 19 is greater than that of the corridor 29 as illustrated in FIG. Figure 1 or vice versa. The device 2 for heating, ventilation and / or air conditioning according to the invention is suitable for any known housing architecture namely centered or semi-centered.

A centered architecture corresponds to a heating, ventilation and / or air conditioning device whose air inlet housing (part of the housing comprising the blower) and the main housing (part of the housing comprising the heat exchangers) are arranged in the same longitudinal plane. A semi-centered architecture corresponds to a heating, ventilation and / or air conditioning device whose air inlet housing and the main housing are not arranged in the same longitudinal plane, the air inlet housing being arranged laterally to the main housing. By the combined arrangement of the first flap 18 and the second flap 28, the first and second heat exchangers 6, 8 are arranged substantially parallel to bring them together and thus reduce the volume of the device 2 heating, ventilation and / or air conditioning. However heat exchangers 6.8 may be slightly inclined to form a V. The first and second bypass paths 16, 26 are arranged on either side of the first heat exchanger 6. 25

Claims (10)

REVENDICATIONS1. Device (2) for heating, ventilation and / or air conditioning for a motor vehicle, comprising: - a first heat exchanger (6), - a channel (3) for the flow of an air flow where the first exchanger is arranged of heat (6), - a first bypass (16) of the first heat exchanger (6), - a first flap (18) and a second flap (28) at least partially obstructing the flow channel (3) of the air flow, said flaps (18, 28) being situated close to the first heat exchanger (6), characterized in that the first flap (18) is of sliding type while the second flap (28) is of a different type of the first part (18). 2. Device according to claim 1, characterized in that said first and second flaps (18, 28) are arranged upstream, with respect to the flow direction of the air flow, the first heat exchanger (6). 3. Device according to one of claims 1 or 2, characterized in that a second heat exchanger (8) is arranged upstream, relative to the direction of flow of the air flow, the first heat exchanger (6). 4. Device according to one of claims 1 to 3, characterized in that the first flap (18) comprises a gear (20) in communication with racks. 5. Device according to one of claims 1 to 4, characterized in that the second flap (28) is drum type. 6. Device according to one of claims 1 to 5, characterized in that it comprises a second bypass path (26) of the first heat exchanger (6), the second bypass path (26) being arranged at a distance from the first bypass (16). 3034047 12 7. Device according to claim 6, characterized in that the first flap (18) is disposed at the first bypass path (16) and the second flap (28) is disposed at the second bypass path (26). . 8. Device according to one of claims 5 or 6, characterized in that it comprises a separating element (30) arranged between said bypass paths (16, 26) of the first heat exchanger (6), comprising 10 reception means able to accommodate the first component (18) and the second component (28). 9. Device according to one of claims 3 to 8, characterized in that said heat exchangers (6, 8) are arranged substantially parallel. 10. Device according to one of claims 6 to 8, characterized in that said bypass paths (16, 26) are arranged on either side of the first heat exchanger (6). 20