FR3010659A1 - AIR CONDITIONING DEVICE FOR MOTOR VEHICLE INCORPORATING LATERAL AIR MIXING MEANS - Google Patents

Abstract

The invention relates to a device (1) for air conditioning of a motor vehicle, comprising an enclosure (2) containing an evaporator (3) and a radiator (4) separated from the evaporator (3) by an intermediate region (16). ), for a flow of air passes through the evaporator (3) and the radiator (4) while splitting to form a left-right airflow discharged by a left and right air outlet, in which l enclosure (2) comprises: - two left and right lateral extensions (17, 18) for channeling air from the intermediate region (16) to two left and right mixing zones (19, 21) situated downstream radiator (4) and upstream of the left and right outlets (7, 10); two left and right distribution flaps (17, 18) located in the left and right mixing zones (19, 21) for adjusting in each mixing zone the proportion of air coming from the extension and air having passed through. the radiator.

Description

The invention relates to a motor vehicle air conditioning device comprising means for heating, ventilating and cooling the air of the passenger compartment, so as to in particular to regulate the temperature in the passenger compartment and to demist its windows. BACKGROUND OF THE INVENTION Such a device is generally located between the front seats and the dashboard of the vehicle that it equips. It comprises a casing delimiting an internal enclosure having several air inlets and several air outlets, this enclosure enclosing an evaporator for cooling the air and a radiator for heating it. Various shutter systems and other adjustable shutters are also provided for adjusting the air flow rates in the evaporator, in the radiator and in the air inlets and outlets, so as to regulate the temperature of the treated air.

Such a device is advantageously of the double-air flow type: an air flow said to be greater between and exits through inlets and outlets located in an upper portion of the enclosure, and a so-called lower airflow between and out by inputs and outputs located in a lower portion of the enclosure. Two separate blower systems force the flow of upper and lower flows independently, so that the upper flow passes through the upper portion of the evaporator and radiator, and the lower flow passes through the lower portions of these elements. The upper flow makes it possible, for example, to regulate the temperature in the upper portion of the passenger compartment and to demist the front windows of the vehicle, while the lower flow makes it possible, for example, to regulate the temperature in the lower portion of the passenger compartment. The flows are split laterally: the enclosure has a central inner wall oriented vertically which divides into two symmetrical parts relative to this wall. The upper flow has a left portion and a right portion for regulating the temperature respectively of the left and right portions of the upper portion of the passenger compartment. The same is true of the lower stream.

In a solution disclosed by the utility model DE29504860U1, the radiator is mounted in a main pipe wider than this radiator, so that air can pass through the radiator and / or bypass laterally. Two flaps are mounted on either side of the radiator to regulate, in the left part and in the right part, the flow of air bypassing the radiator. Each flap is movable between a position in which it covers a radiator motive and an opposite position in which it closes the lateral part of the main pipe to prohibit the passage of air. This arrangement thus makes it possible to regulate the temperature independently in the left-hand part and in the right-hand part of the air flow, but its bulk is important because it requires a main duct that is significantly wider than the radiator over the entire length of the duct. 'pregnant. OBJECT OF THE INVENTION The object of the invention is to propose a solution to remedy this drawback. SUMMARY OF THE INVENTION To this end, the invention relates to a motor vehicle air conditioning device, comprising a chamber enclosing an evaporator and a radiator, the radiator being located downstream of the evaporator and being separated from the latter by an intermediate region, this enclosure being arranged so that an air flow admitted by an inlet of the enclosure successively passes through the evaporator and the radiator while splitting to form a left air flow and a flow of straight air discharged by a left air outlet and a straight air outlet, wherein the enclosure comprises: - a left extension to collect air in the intermediate region and deliver it in a zone of left mixture located downstream of the radiator and upstream of the left air outlet, opening into this mixing zone parallel to the downstream face of this radiator; a straight extension for collecting air in the intermediate region and delivering it to a right mixing zone situated downstream of the radiator and upstream of the straight air outlet and opening into this mixing zone parallel to the face downstream of this radiator; - A left mixing flap located in the left mixing zone to adjust the proportion of air from the left extension and air passed through the radiator in the mixture discharged by the left air outlet; - An upright mixing flap located in the right mixing zone to adjust the proportion of air from the straight extension and air having passed through the radiator in the mixture discharged by the right outlet. Thanks to the extensions that open parallel to the downstream face of the radiator, each mixing flap can dose the proportions of hot and cold air being movable for less than a quarter turn, which limits the size of the device according to the invention which is capable of producing different air mixtures for the left stream and the right stream. The invention also relates to a device thus defined, wherein each mixing flap has a generally rectangular contour wall shape being rotatably mounted on an axis coinciding with one of the edges of the rectangular contour, each mixing flap being movable between a position in which it is folded against the radiator and a position in which it is folded against a mouth of the extension associated with the mixing flap. The invention also relates to a device thus defined, wherein each extension bypasses an edge of the radiator, and wherein the axis of rotation of each mixing flap runs along a radiator edge bypassed by an extension. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a sectional side view of the left-hand part of the air-conditioning device according to the invention; Figure 2 is a top view in section of the air conditioning device according to the invention. DETAILED DESCRIPTION OF THE INVENTION The idea behind the invention is to provide two pipes bypassing the radiator opening out parallel to its rear face so that the mixing zones of hot air and cold air comprising the mixer flaps are located directly behind the radiator to reduce the bulk of the assembly.

The conditioning device according to the invention, which is represented in the figures by being marked with 1, comprises a casing 2 delimiting an internal enclosure which encloses an evaporator 3 for cooling the air and a radiator 4 for heating it. This casing 2 comprises in its lower region a common lower air inlet 6 located upstream of the evaporator 3, and a lower left air outlet 7 located downstream of the radiator 4 and a lower right air outlet . The air of the lower flow is thus admitted through the inlet 6 before being split and successively passing through a lower portion of the evaporator 3 and a lower portion of the radiator 4 to be discharged by the lower left and right outlets. The flow of the lower flow is forced by a ventilation system not visible in the figures. The flow of the upper flow is in turn forced by a ventilation which feeds a common upper inlet 9. This upper flow is then split to pass successively an upper portion of the evaporator 3 and the radiator 4, before arriving in a cavity high case marked by 11.

The radiator 4 and the evaporator 3 are both parallelepipedic, and they extend approximately vertically in front of each other when the device is in place, the radiator being the element which is the most forward in relation to the direction of travel of the vehicle. The upper and lower air flows follow horizontal trajectories as they pass through these elements.

The upper cavity 11 corresponds to the upper region of the inner enclosure delimited by the casing 2: it extends above the assembly formed by the radiator 4 and the evaporator 3 through which the lower flow and the flow flow. superior. The chamber 2 delimits firstly a lower and upper flow circulation duct which extends from the inlets 6, 9 while closing the evaporator 3 and the radiator 4, and on the other hand the upper cavity 11 which is located above this sheath and which communicates with this sheath at a region located downstream of the radiator 4. The sheath and the upper cavity are each divided into a left portion and a straight portion by a central wall of the enclosure 2, to split the lower stream and the upper stream. This central wall appears in Figure 4 where it is marked 15. The upper cavity 11 has three upper left outputs 12, 13, 14 and three straight upper outputs symmetrical to each other with respect to the central wall.

The air of the upper left flow introduced into the left part of the upper cavity 11 is thus discharged by the upper left outlets 12, 13, 14. In practice, the lower left outlet 7 corresponds to the foot region of the left rear passenger of the passenger compartment, the left upper outlet 12 corresponds to another ventilation of the left rear part of the passenger compartment. The upper left outlets 13 and 14 respectively correspond to a front left ventilation and defogging glazing located in the left front part of the passenger compartment. According to the invention, the lower portion of the chamber 2 comprises a left lateral extension 17 and a right lateral extension 18, both of which circumvent the lower portion of the radiator 4, respectively from the left and the right. The left lateral extension takes a portion of the left air flow at the intermediate region 16 to discharge it at a left mixing zone 19 which is located on the left side of the lower portion of the downstream region of the radiator 4 and upstream of the lower left outlet 7. Similarly, the right lateral extension 18 takes a portion of the right air flow in the intermediate region 16 to discharge it at a right mixing zone 21 located in right portion of the lower portion of the downstream region of the radiator 4 and upstream of the bottom right outlet marked by 10 in Figure 2. A left mixing flap 22 is placed in the left mixing zone 19 to adjust the proportions of hot and cold air constituting the lower left stream discharged by the lower left outlet 7. This flap has a generally rectangular wall shape, and is pivotally mounted about an axis coinciding with one of its edges which thus constitutes a fixed edge of this shutter. As can be seen in FIGS. 1 and 2, the axis of rotation of the flap 22 runs along the left vertical edge of the radiator, so that this flap can occupy a position folded against the radiator to open the lateral extension 17 as much as possible, which corresponds to a situation in which the lower left flow comprises only cold air taken at the outlet of the evaporator 3. In contrast, this flap 22 can occupy a folded position against the opening by which the lateral extension 17 opens into the mixing zone 19, so as to close the intake of cold air while completely uncovering the left part of the radiator, which corresponds to a situation in which the lower flow comprises only hot air. The right mixing flap, indicated by 23 is the symmetrical left mixing flap 19 relative to the central partition wall of the chamber 2, which appears in Figure 2 by being marked by 15. As visible in the figures , the left extension 17 and the right extension 18 open out one and the other in the mixing zones 19 and 21 being oriented parallel to the downstream face of the radiator 4, to limit the movement of the flaps 22 and 23 to about a quarter turn. Thus, the two extreme positions that can be occupied by the left flap 22 are spaced from each other angularly by a value less than a quarter turn around the axis of rotation of each mixing flap. In the configuration shown in Figure 2, the left flap 22 is folded against the left side of the downstream face of the radiator, so that the left flow discharged by the lower left outlet 7 comprises only cold air from the lateral extension 17 and which is protected from heating by the radiator with the flap folded against it. The right mixing flap 23 is in turn folded against the opening of the lateral extension 18 to close it while completely uncovering the right part of the rear face of the radiator 4, so that the flow discharged by the bottom right outlet 10 comprises only the air heated by the radiator 4. Each of the two mixing flaps 22, 23 may occupy any intermediate position between its folded position against the radiator and its folded position against the opening of the lateral extension against which it is mounted, which allows to produce a lower left and right flow having two different temperatures which are adjustable independently of one another by simple adjustment of these two mixing flaps. As can be seen in the figures, the device according to the invention makes it possible to produce a mixture of hot and cold air at the level of the lower left flow and at the level of the lower right flow while remaining very compact, particularly because the mixing flaps are located directly downstream of the radiator in a configuration by which they do not project laterally with respect to the radiator.

Claims (3)

REVENDICATIONS1. Device (1) for air conditioning of a motor vehicle, comprising an enclosure (2) enclosing an evaporator (3) and a radiator (4), the radiator (4) being located downstream of the evaporator (3) and being separated from the latter by an intermediate region (16), this chamber being arranged so that an air flow admitted by an inlet (6, 9) of the enclosure (2) passes successively through the evaporator (3) and the radiator (4) while splitting to form a left air flow and a straight air flow discharged by a left air outlet (7, 12, 13, 14) and a straight air outlet, in which the enclosure (2) comprises: - a left extension (17) for collecting air in the intermediate region (16) and delivering it into a left mixing zone (19) situated downstream of the radiator (4) and upstream of the left air outlet (7) opening into this mixing zone parallel to the downstream face of this radiator (4); a straight extension (18) for collecting air in the intermediate region (16) and delivering it to a right mixing zone (21) located downstream of the radiator (4) and upstream of the straight air outlet (10) and opening into this mixing zone parallel to the downstream face of the radiator (4); - a left mixing flap (22) located in the left mixing zone (19) for adjusting the proportion of air coming from the left extension (17) and air having passed through the radiator (4) in the forced mixture by the left air outlet (7); a right mixing flap (23) located in the right mixing zone (21) for adjusting the proportion of air coming from the straight extension (18) and air having passed through the radiator (4) in the forced mixture by the right exit (10). 2. Device (1) according to claim 1, wherein each mixing flap (22, 23) has a generally rectangular contour wall shape being rotatably mounted on an axis coinciding with one of the edges of the rectangular contour, each mixing flap (22, 23) being movable between a position in which it is folded against the radiator (4) and a position in which it is folded against a mouth of the extension (17, 18) associated with this mixing flap (22, 23). 3. Device according to claim 2, wherein each extension (17, 18) bypasses an edge of the radiator (4), and wherein the axis of rotation of each mixing flap (22, 23) runs along a radiator edge ( 4) bypassed by an extension.