FR2794069A1 - AIR DISTRIBUTOR OF A HEATING-VENTILATION AND / OR AIR CONDITIONING DEVICE OF A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to an air distributor of a heating-ventilation and / or air conditioning device for the passenger compartment of a motor vehicle. The defrost duct (22) and the ventilation duct (23) communicate with the mixing chamber (17) via an outlet chamber (7) isolated from the lower duct (21). A first flap (25) of the drum type regulates the flow of mixed air supplied to the outlet chamber (7). A second shutter (26) of the butterfly type regulates the air flow supplying the lower duct, and a third shutter (27) of the drum type, distributes the air entering the outlet chamber (7) between the defrost duct ( 22) and the ventilation duct (23). The member controlling the rotational movement of the first flap (25) is directly connected to the air distribution control.

Description

The invention relates to a heating-ventilation device

  and / or air conditioning of the passenger compartment of a motor vehicle.

  It relates more precisely to a heating device

  ventilation and / or air conditioning of the type comprising in a housing a cold air transmission branch and an air heating branch both interposed between a cold air inlet and an air mixing zone, which communicates with a first upper duct, a second upper duct and at least one lower duct, and means for distributing the mixed air delivered by the mixing zone between the first upper duct, the second upper duct and the lower duct. The upper ducts are suitable for supplying air to defrost and ventilation openings, while the duct (s)

  lower (s) deliver (s) hot air to the feet of the passengers.

  The cold air coming from outside the passenger compartment or from inside the passenger compartment, in the event of recycling, or possibly from an air conditioning unit, is distributed between the cold air transmission branch and the air heating branch by at least one mixing flap, which

  adjusts the average air temperature in the mixing zone.

  The mixing flap can take two extreme positions, in which the air introduced by the cold air inlet passes entirely, either through the cold air transmission branch or through the air reheating branch. In each of these extreme positions, the air temperature

  in the mixing zone is homogeneous.

  It is not the same in an intermediate position of the mixing flap. There is indeed a stratification of the air temperature in the mixing zone, because the air heated in the heating branch penetrates laterally in the zone on the side of the lower duct, while the fresh air coming from the branch transmission is directed at higher speed radially towards the mixing zone on the side of the defrosting duct. As a result, the air flow circulating in the mixing zone has an inhomogeneous temperature in a cross section. This temperature is warmer on the side of the lower duct, average in the middle zone normally supplying the

  ventilation duct and colder on the side of the defrost duct.

  The function of the defrosting duct is to send a flow of air to at least one of the vehicle windows, in particular the windshield, in order to allow demisting or defrosting of this window. It is therefore advisable that the air sent to this area is at a medium or hot temperature, especially in cold weather when most of the hot air is directed to the lower duct in order to send an air flow. hot towards the feet of the passengers, the defrost duct receiving only a small quantity of air which, if it is at a temperature too low, does not succeed in demisting the windshield

effectively.

  In the combined ventilation / heating mode of the feet, the air transmitted to the ventilation duct must be at a

  temperature lower than the air transmitted to the lower duct.

  To remedy this, FR 2 727 156 and FR 2 650 224 propose installing hot air ducts having an inlet opening at the outlet of the air heating branch and an outlet opening into the

defrost duct.

  FR 2 733 943, on the contrary, offers fresh air supply channels having an inlet opening which communicates with the fresh air inlet and an outlet opening which opens into an outlet chamber supplying the ventilation duct. and the heating duct, these supply channels being provided externally with two lateral wings which form deflectors to promote the sending of hot air from the branch

  to the heating duct.

  The provision of these hot air ducts of these fresh air supply channels in the mixing zone requires additional space in the device housing, leads to increased costs and complicates the air distribution function between the three outlet ducts. It should be noted for this purpose that in the three documents cited above, a first butterfly flap is provided for adjusting the air flow in the defrost duct and a second butterfly flap for

  distribute the air between the ventilation duct and the lower duct.

  These designs are ill-suited for devices with small lateral dimensions or for devices in which the outlets for defrost air and aeration air are installed side by side.

  side transversely to the vehicle axis, from front to rear.

  In addition, the blades or partitions require the production of several housings or plastic parts which are difficult to assemble.

in a simple process.

  The multiplicity of resulting parts and assembly made complex, not allowing to reach a competitive cost level. These blades or partitions also have a negative effect on the pressure drop of the air circuit and on the acoustic level of the

  air conditioning heater.

  The object of the invention is to provide a heating device

  ventilation and / or air conditioning in which the air distribution function is simplified, and which automatically adjusts the temperature differences of the air supplied to the ducts in the combined operating modes foot heating plus defrosting or ventilation. The invention achieves its object by the fact that the first upper conduit and the second upper conduit communicate with the mixing zone by means of an outlet chamber isolated from the lower conduit and by the fact that the means for distributing the mixed air delivered by the mixing zone between the outlet chamber and the lower duct comprises a first flap capable of adjusting the opening of the passage between the mixing zone and the outlet chamber, this first flap being capable of sending selectively to the air outlet chamber at a temperature colder than the average temperature of the air in the mixing zone when it partially opens said passage on the side of the cold air transmission branch, and air at a temperature warmer than the average temperature of the air in the mixing zone when it opens

  partially said passage on the side of the air heating branch.

  The displacement of the first flap is advantageously coupled with the displacement of a deflector which, in an extreme position, completely frees the passage of air and has no effect. Preferably,

  the first flap and the deflector are part of the same piece.

  The first upper duct is a defrost duct and the

  second upper duct is a ventilation duct.

  The means for distributing the mixed air further comprise a second flap disposed at the inlet of the lower duct and intended to regulate the air flow, supplying said lower duct, and a third flap for selectively sending the air delivered in the outlet chamber towards the

  first upper duct and / or the second upper duct.

  Thus, in the combined operating mode of foot heating plus ventilation, the cold air transmission branch is in direct communication with the outlet chamber and the ventilation duct. The temperature of the air diffused by the aeration duct is then lower than the temperature of the air supplied to the lower duct. In the combined operating mode of foot heating plus defrosting, the air circuit in the mixing zone is extended and the mixing of fresh air with the heated air is better achieved, and a temperature of the

more homogeneous mixture.

  Preferably, the first component is a drum type component, the second component is a butterfly type component and the third component is a

drum type shutter.

  Advantageously, the rotational movements of the three components are controlled by control members controlled by a

  air distribution control, movable between two extreme positions.

  Preferably, the member controlling the rotational movement of the first flap is connected directly to the air distribution control,

  and the control component of the second component is connected to the first component.

  According to a preferred embodiment, the housing comprises

  above the mixing zone and the lower duct a semi-wall

  cylindrical which has in its median zone a window defining the passage between the mixing zone and the outlet chamber, and the first flap is capable of being placed in front of said wall respectively by either side of the window in the extreme positions of the air distribution control. In addition, the second shutter closes the lower duct in the extreme positions of the air distribution control, which

  one corresponds to the defrosting mode and the other to the ventilation mode.

  Other advantages and characteristics of the invention

  will emerge on reading the following description given by way of example and

  with reference to the accompanying drawings in which: - Figure 1 and a cross section along a vertical plane of a ventilation heating device according to the present invention; FIG. 2 shows the arrangement of the flaps in defrosting mode; - Figure 3 shows the arrangement of the flaps in heating mode feet plus defrost; - Figure 4 shows the arrangement of the flaps in foot heating mode; FIG. 5 shows the arrangement of the flaps in heating mode of the feet plus ventilation; - Figure 6 shows the arrangement of the flaps in ventilation mode; - Figure 7 shows an embodiment of the control member of the air flow adjustment flap in the lower duct; Figure 8 shows a second embodiment of the control member of the air flow adjustment flap in the lower duct. The heating-ventilation device 1 for the passenger compartment of a motor vehicle, shown in the drawings, comprises a housing 2 of

  elongated shape in a direction perpendicular to the plane of the figures.

  This housing 2 is delimited by a U-shaped bottom wall 3, an upper wall 4 and two end walls parallel to the planes

figures.

  The lower part 5 of the upper wall 4 has a semi-cylindrical shape and has in its upper zone a window 6 which opens into an outlet chamber 7. The lower walls 3 and upper 4 are spaced from one another and they delimit between them,

  a side air inlet 8 and an air outlet 9 below the window 6.

  The air inlet 8 is connected to the outlet pipe 10 of a turbine 1 1 capable of sucking air either from the outside or from the inside of the passenger compartment in the event of recycling. An air cooling device 12 can be mounted upstream of the air inlet 8 in the outlet pipe 10. An internal transverse wall 13, connecting the end walls, is disposed inside the housing 2 A heat exchanger 14 is interposed between the internal wall 13 and the bottom wall 3. The internal wall 13 divides the interior of the housing 2 into a cold air transmission branch arranged on the side of the top wall 4 and a branch heater 16, located on the side of the bottom wall 3 and in which is the heat exchanger 14. The heater branch 16 has a U-shaped configuration and opens downstream in a mixing zone 17 located immediately in upstream of the air outlet 9 and in the

  extension of the cold air transmission branch 15.

  A butterfly type flap 18 is pivotally mounted at the entrance to the air heating branch 15. A second drum type flap 19 is provided at the exit from the heating branch 15. The latter flap 19 can pivot around 'a transverse axis 20 located in the mixing zone 17, in order to selectively close off the cold air transmission branch 15 and the air heating branch 16. These two flaps 18 and 19 constitute the mixing flaps which allow to adjust the proportions of cold air, coming from the air inlet 8, to be delivered directly to the mixing zone 17 by the cold air transmission branch 15 and to be transited

by the heating branch 16.

  The air outlet 9 communicates directly with a lower duct 21 directed downwards outside the lower wall 3 of the housing. The air outlet 9 also communicates via the window 6 with the outlet chamber 7. The outlet chamber 9 communicates directly with a defrost duct through the orifice 22 and

  with an air duct through port 23.

  The lower duct 21, or heating duct, located above

  above the air heating branch 15 is capable of sending a flow of fresh or heated air to at least one nozzle (not shown) located in the lower part of the passenger compartment to direct this air towards the feet of the

vehicle occupants.

  The ventilation duct is capable of sending a flow of fresh or heated air to at least one aerator (not shown) located in particular on the dashboard of the vehicle. In general, aerators are provided

  central and side vents.

  The defrost duct is able to send fresh or heated air to a nozzle (not shown) located near a window

  of the vehicle, including the windshield.

  The air supplied to the mixing zone 17 is distributed between the lower duct 21, the orifice 22 of the defrosting duct and the orifice 23 of the aeration duct by means of three flaps 25, 26 and 27 whose displacements are controlled by control members controlled by the same air distribution control located in the passenger compartment of the vehicle. The first flap 25 is of the drum type and is pivotally mounted about an axis 28 located in the vicinity of the upper end of the lower wall 3, at the confluence of the air reheating branch 16 and the lower duct 21, this axis being substantially the axis of revolution of the semi-cylindrical part 5 of the upper wall 4. This flap 25 comprises a sector 29 of cylindrical wall having about an opening of 60 and

  a radius slightly smaller than the radius of the semi-cylindrical part 5.

  The latter, which extends over a sector of approximately 180, comprises from left to right in the figures a first solid sector 5a of approximately 60, the window 6 which also extends over approximately 60 and a second solid sector 5b of 60 about. In a first extreme position of the air distribution control, the sector 29 of the flap 25 is completely opposite the first solid sector 5a. In this configuration, the window 6 is completely cleared and the outlet chamber 7 communicates with the mixing zone 17, as shown on

Figure 2.

  In the other extreme position of the air distribution control, as shown in FIG. 6, the sector 9 of the flap 25 is completely opposite the second solid sector 5b. In this configuration, window 6 is also completely cleared and the

  outlet chamber 7 communicates with mixing zone 17.

  The second flap 26 is of the butterfly type and it is disposed at the inlet of the lower duct 21 and its pivoting around the axis 30 makes it possible to adjust the flow of air delivered from the mixing zone 17 towards the

lower duct 21.

  The third flap 27, of the drum type, has a sector 31

  mounted pivoting about an axis 32 located in the outlet chamber 9.

  The flap 27 can pivot between a first extreme position in which the ventilation opening 23 is closed and a second position

  extreme in which the defrost orifice 22 is closed.

  The rotations of the three components 25, 26 and 27 are controlled by control members connected directly or indirectly to the

air distribution control.

  Preferably, the control member of the first flap 25 is connected to the control of the air distribution, so that the rotational movement of the first flap corresponds directly to the movement or to the

  rotation of the air distribution control.

  In general, the air distribution control has five preferred positions corresponding to: a - the defrosting mode, b - the foot heating mode plus defrosting, c - the foot heating mode, d the foot heating mode more aeration,

e - ventilation mode.

  Positions a and e correspond to the extreme positions of the air distribution control, and positions b, c and d to intermediate positions. At these positions, a to e correspond respectively five positions of the first flap 25, positions 1 and 5 being the positions

  extremes in which the first flap 25 is inoperative.

  The positions of the second flap 26 and of the third flap 27 as a function of positions I to 5 of the first flap 25 are shown

  respectively in Figures 2 to 6.

  Figure 2 shows the positions of the three flaps 25, 26 and 27 in the defrosting mode. In this configuration, the first flap 25 is in the extreme left position, the second flap 26 closes the lower conduit 21 and the third flap 27 closes the orifice 23 of the conduit

  ventilation. All of the mixed air is directed to the defrost duct.

  If the air transmission control is moved from the position

  a in position b, the flaps 25 and 26 pivot as described above

  after. The first flap 25 passes from position I to position 2 and partially closes the window 6. The second flap 26 pivots by 45 and partially opens the orifice of the lower duct 21. The mixed air is distributed between the duct of defrost and the lower duct, as mounted in FIG. 3. The third flap 27 closes the orifice 23 of the ventilation duct. It can be seen that, in this combined mode of heating the feet plus defrosting, the path of the fresh air delivered by the branch 15 for transmitting cold air is lengthened, which favors the mixing of the mixed air and the homogenization of the temperatures of the air delivered to the duct

  defrost 22 and to the lower duct 21.

  When the air transmission control is moved from position b to position c, as shown in FIG. 4, the first flap 25 is placed opposite window 6, the second flap 26 is placed in parallel to the air flow in the lower duct 21, and the third flap 27 also closes the orifice 23 of the ventilation duct. In this configuration which corresponds to the heating mode of the feet, almost all of the mixed air is delivered to the lower duct 21, only the air leaks near the lateral edges of the first flap 25 are directed

  towards orifice 22 of the defrost duct.

  If the air supply control is moved from position c to position d, the first shutter 25 moves to the right and partially closes window 6, the second shutter 26 again pivots 45 to the right or to the left, and the third flap 27 switches to the left to close the orifice 22 of the defrost duct. In this configuration, shown in FIG. 5, and which corresponds to the heating mode of the feet plus ventilation, the mixed air is distributed between the ventilation duct and the lower duct. However, the branch 15 for transmitting cold air is in direct connection with the ventilation duct 23. The latter therefore will receive air having a temperature lower than the air supplied to the

lower duct 21.

  When the air supply control is moved from position c to extreme position d, the first flap 25 is positioned opposite the solid sector 5b, and the window 6 is completely cleared, the second flap again closes the lower duct 21 and the third flap 27 continues to close the orifice 22 of the defrost duct. In this configuration, shown in FIG. 6, the mixed air is completely delivered to

the air duct.

  When the air transmission control is moved in the opposite direction from e to d then c, then b and finally a, the flaps 25, 26, 27 are

  move in opposite directions to those described above.

  FIG. 7 shows a first embodiment of the control member 40 of the second flap 26. The first flap 25 and the second flap 27 have toothed wheels 41, 42 coaxial with their respective pivot axes 28 and 30. A sector toothed 43 mounted

  pivoting around an axis 44 meshes with the toothed wheels 41 and 42.

  The radii of the toothed wheels 41 and 42 are calculated in such a way that, when the first flap 25 pivots between positions 1 to 5, the second flap 26 substantially makes a half-turn between the two

extreme closing positions.

  Reference 45 represents the sector control body

  toothed 43 on the air supply control.

  FIG. 8 shows a second embodiment of the control member 40 of the second flap 26. This control member 40 comprises a link 50 whose ends are articulated at the ends of two arms 51, 52 respectively secured to the pivot axes 28 and 30 of the flaps 25 and 26. The lengths of the arms 51, 52 and of the link 50 and the angular positions of the arms 51, 52 are calculated such that the second flap 26 can pivot by an angle of 90 between positions 1 to 3 of the first flap 25 and return in the opposite direction between positions 3 to 5 of the

first part 25.

] 1

Claims (13)

  1. Heating-ventilation and / or air-conditioning device for the passenger compartment of a motor vehicle, of the type comprising in a housing (2) a branch (15) for transmitting cold air and a branch (16) for reheating air both interposed between a cold air inlet (8) and an air mixing zone (17), which communicates with a first upper duct (22), a second upper duct (23) and at least one duct lower (21), and means for distributing the mixed air supplied by the mixing zone (17) between the first upper duct (22), the second upper duct (23) and the lower duct (21), characterized by the the fact that the first upper duct (22) and the second upper duct (23) communicate with the mixing zone (17) via an outlet chamber (7) isolated from the lower duct (21) and thereby that the means for distributing the mixed air delivered by the mixing zone (17) between the outlet chamber (7) and the lower duct (21) comprise: a first flap (25) capable of adjusting the opening of the passage (6) between the mixing zone (17) and the outlet chamber (7), this first flap (25) being able to selectively send air to the outlet chamber (7) at a temperature colder than the average temperature of the air in the mixing zone (17) when it partially opens said passage (6 ) on the side of the branch (15) for transmitting cold air, and air at a temperature hotter than the average temperature of the mixing zone (17) when it partially opens said passage (6) on the side   of the air heating branch (16).   2. Device according to claim 1, characterized in that the movement of the first flap (25) is coupled with the movement of a deflector (60) which in an extreme position completely releases the   air passage and has no effect.   3. Device according to claim 2, characterized in that   the first flap (25) and the deflector (60) are part of the same part.   4. Device according to any one of claims I to 3,   characterized in that the first upper duct (22) is a defrosting duct and the second upper duct (23) is a ventilation duct.   5. Device according to any one of claims I to 4,   characterized in that the means for distributing the mixed air further comprises a second flap (26) disposed at the entrance to the lower duct   (21) and intended to regulate the air flow supplying said lower duct (21).   6. Device according to claim 5, characterized in that said means further comprises a third flap (27) for selectively sending the air supplied in the outlet chamber (7) to the first   upper duct (22) and towards the second upper duct (23).   7. Device according to claim 6, characterized in that the rotational movements of the three flaps (25, 26, 27) are controlled by control members controlled by a single control of   mobile air distribution between two extreme positions.   8. Device according to claim 7, characterized in that the member controlling the rotational movement of the first flap (21) is   connected directly to the air distribution control.   9. Device according to claim 8, characterized in that the control member (40) of the second flap (26) is connected to the first flap (25).   10. Device according to claim 9, characterized in that the control member (40) of the second flap (26) comprises a toothed sector (43) meshing with toothed wheels (41, 42) integral   respectively of the first component (25) and the second component (26).   1l. Device according to claim 9, characterized in that the control member (40) of the second flap (26) comprises a link (50) articulated on lever arms (51, 52) integral   respectively of the first component (25) and the second component (26).   12. Device according to any one of claims 7 to   , characterized in that the housing (2) comprises, above the mixing zone (17) and the lower duct (21), a semi-cylindrical wall (5) which has in its central zone a window (6) defining the passage between the mixing zone (17) and the outlet chamber (7), and by the fact that the first flap (25) is of the drum type and is capable of being placed in front of said wall, respectively from side and side other of window (6) in the extreme positions of the distribution control of air.   13. Device according to claim 12, characterized in that the second flap (26) closes the lower duct (21) in the   extreme positions of the air distribution control.   14. Device according to any one of claims 6 to   13, characterized in that the first flap (21) is a drum type flap. 15. Device according to claim 14, characterized in that the second flap (26) is of the butterfly type, and the third flap (27) is drum type.