Heating or air conditioning installation for motor vehicles.

The invention relates to a a heating or air conditioning system for A motor vehicle according to the preamble of claim 1.

From the <b>US 4,482,009</b> is a heating or air conditioning system with a fan and a heater unit known, downstream of is designed to be divided heater unit of the air distribution space. From the first air distribution space lead two air channels Air conditioning zones of the front compartment, namely the driver and passenger seats. From a second air distribution space lead two channels to air conditioning zones of the rear area, namely a back seat behind the driver and a rear seat behind the passenger. To the Branch points of the ducts are each air controls arranged to control the respective air conditioning zones supplied air quantity. A disadvantage of the known system that only the temperatures of two climate zones, one hand, the temperature of the air conditioning zones for the front room and on the other hand, the temperature for the air conditioning zones the back space, are independently adjustable. Although in Later the duct air controls provided that the mixture of leading to a front air conditioning zone Airflow with a leading to a rear air conditioning zone Air stream allowed. The temperature setting is thereby caused but still depends on the position of Luftsteuerlemente controlling the amount of air to other climate zones.

Furthermore, from <b>DE 39 40 361 A1</b> a heating or air conditioning for motor vehicles to the climate zones of the rear area, a first air passage for guiding cold air and a second air passage for guiding hot air is used. The two Air ducts open into a mixing chamber in which a desired temperature of serving for the ventilation of the rear compartment air flow adjustable is. The air duct for guiding the air flow into the foot area the back space branches upstream of Mündungsbreichs of the Warm-air duct, so that its temperature is dependent on the Temperature conditions in the front room. A disadvantage of this known System is that the control of the air quantity for the Backcourt in a rear space region near a significant footprint connected is.

Object of the invention is therefore to provide a heating or air conditioning indicate the temperature of the front and rear of a vehicle, which improves the user comfort when the temperature setting and is a space-saving.

To achieve the object, the invention comprises the features of claim 1 on.

A particular advantage of the invention is that in a simple Thus, the temperature for at least four air conditioning zones of adjustable motor vehicle independently. Directly in the area of ​​the heater, the temperature of each to Cooling zone air current set with a Interaction or an exchange of air streams of different Air conditioning zones is avoided. Thus, a separate and intractable temperature setting between the front and rear space done. Another advantage results from the fact that the temperature setting the air flows directly in the area of ​​the heater unit is made. The means for adjusting the temperature do not require a higher footprint than a conventional air conditioning for only two climate zones.

According to one embodiment of the invention, the heater unit is in divided four heater zones, so that four partial airflows through the radiator unit are passed through. This partial airflows are each supplied air channels after leaving the heater unit, done mixing with other partial airflows without can.

According to a development of the invention, the heater unit of a single radiator that to form the four heating zones a vertical and a horizontal separation has. The vertical separation is effected in that the connection for the supply the center of the heating body is arranged so that the cooling means each towards the outside and parallel opposed Water tanks flows into about a plane. The radiator is in constructed essentially symmetrical, it like a having left and right part. The left and right part of the Radiator each have a horizontal partition wall which these divided into an upper segment and a lower segment.

According to a development of the invention, the lower segment associated pipes of a radiator provided with turbulence inserts. This is a better heat transfer in the lower segments generated, so that the air flow of the lower and thus the Backcourt assigned part of the radiator, a comparatively higher Temperature is achievable.

Further advantages of the invention result from the further dependent claims.

Two embodiments of the invention will be based of the drawings explained in more detail.

Show it:<dl tsize="7"><dt><b>Fig. 1</b></dt><dd>A schematic representation of an air conditioner according to a first embodiment,</dd><dt><b>FIG. 2</b></dt><dd>a schematic representation of an air conditioner according to a second embodiment and</dd><dt><b>Fig. 3</b></dt><dd>a front view of a heater unit.</dd></dl>

In <b>Fig. 1</b> is an air conditioner for the installation in motor vehicles shown schematically. Air conditioning is relative to a vertical Longitudinal center plane formed symmetrically, so that the temperature never separated from the driver's side to the passenger's side can be. The air guide shown in FIG. 1 can therefore both for the driver and passenger side are.

The air conditioning system shown in FIG. 1, the input side a blower 1, which draws an air stream 2nd The air flow 2 may in Dependence on a recirculation / fresh air flap not shown either a flow of fresh air or a forced air flow. The Input Air flow 2 applied to an evaporator 3, by an Refrigerant is flowing through and the air flow to a predetermined Temperature cools. Downstream of the evaporator 3 is a heater unit arranged, which consists of an integral radiator 4th Alternatively, the heater unit of several Radiator segments which are assembled in a modular manner. Downstream of the radiator 4 perform a plurality of air ducts to the corresponding outlet nozzles in the motor vehicle. to guide of the air flow at a front space side are a ventilation duct 5, a defrost duct 6 and a Foot duct 7 provided. The ventilation channel 5 is affixed to the housing wall side. Channels 5, 6 and 7 are an upper segment 8 of the heater and perform assigned the flow of air to air-conditioning zones of the front space. a lower Segment 9 of the radiator 4 are air ducts associated with the tempered Air out the air conditioning zones of the back space. to Guiding the air stream to a foot portion of the rear space is a Foot duct 10 is provided which is adjacent to the footwell channel 7 for the front room. Housing wall side, then a ventilation duct 11 formed of an air stream in a higher range the back space leads. The aforementioned air channels are so arranged to take place in a simple manner a temperature stratification can. The ventilation channels 5 and 11 are the housing wall side in Extension of a bypass 12 or 13, wherein each a mixing flap 14 for the upper section and a mixing flap 15 provided for the lower part are for adjusting the amount of air or the air temperature. The mixing flaps 14 and 15 are immediately arranged and form subsequent to the radiator 4 an air distribution, which means the mixing flap 14, the temperature in the ventilation duct 5 and the defrost duct 6 can be influenced and by means of the mixing flap 15, the temperature in the footwell channel 10 and the ventilation channel 11 is set for the backcourt. Of the Foot duct 7 is arranged centrally and receives an immediately Radiator 4 tempered flow of air. To adjust the temperature the radiator 4 regulated on the water side, ie the radiator 4 is connected via connecting pieces with valves, not shown, whose Opening position is dependent on the temperature to be set. As can be seen from Fig. 1, by operating the mixing valve 15, the temperature in the footwell channel 10 and in the ventilation duct 11 independently of the temperature in the front of the air conditioning zones conducting channels 5, 6 and 7 can be adjusted.

According to a preferred embodiment of the invention, the radiators 4 segment-like design. As from<b>Fig. 3</b> It can be seen consists of the radiator 4 made of a left and right portion 16, or 17. The supply of coolant is done via a between these two parts 16 and 17 arranged medium inlet opening 18, which leads the coolant into a central plenum chamber 19, of the from it by horizontal tubes 20 to the laterally displaced left Plenum chamber 21 and right channel box is 22 passed. Both 16, the left part and the right part 17 of the radiator 4 is in an upper segment 23 and 24, as well as in a lower segment 25 and 26 split. One from the central plenum chamber 19 to a side wall 27 extending partition 28 separates the upper segment runs 23 25 of the lower segment Correspondingly in the right part 17 of the radiator 4 a dividing wall 29 to directly to an opposite side wall 30 of the radiator 4. The Segments 23, 24, 25, 26 are each discharge ports 31, 32, 33 and assigned to 34, through which the coolant from the radiator return 4 can flow out. According to a particular embodiment of the invention the upper segments 23 and 24 Water-side control, while the lower segments 25 and 26 are controlled on the air side. This can be largely independent temperature settings allow between Voderraum one hand and backcourt other.

Advantageously the tubes of the lower segments 25, 26 are formed in such a way be, that the heating body 4 for the footwell a higher temperature makes available than for the front room. To this end could, for example, turbulence inserts in the heat-conducting tubes the lower segments 25, to be used 26, the swirling a cause of the coolant and thus a better heat transfer create.

According to a further embodiment of the invention according to <b>FIG. 2</b>the radiator 35 is governed solely airside. to this Purpose upstream of the radiator 35, an upper-air valve 36 and a downstream arranged second mixed air flap 37 is provided for air volume adjustment of the front compartment. In the unterern Area of ​​the radiator 35 are for adjusting the amount of air for the backcourt a lower mixed air damper 38 upstream and a second mixed air flap 39 downstream of the radiator 35 arranged. By the position of mixing dampers 36, 37, 38, 39, the temperature of an evaporator is acted upon by 40 adjusted air stream 41 are separated between the front and rear space will. Above a partition wall 42, an upper air distribution 43 formed by the temperature-controlled from the air through a ventilation duct 43, a defrost duct 44 and a footwell channel 45 in is directed to the front room. The ventilation channel 43 extends substantially immediately downstream of the evaporator 40 while bypassing the radiator 35, and a pivoting flap 46 of the area Luftverteilraums 43 is provided by means of which heated air is mixed with can be. Below the partition wall 42 is a lower Air distribution chamber 48 is formed, in which the temperature of the Backcourt provided airflow is adjusted. In addition, a pivoting flap 49 in a range between a starting 50 and a ventilation duct 51 disposed footwell channel so that both Channels 50, 51, a different proportion of through the evaporator 40 Cooled air can be admixed. Also, this embodiment the invention allows independent temperature settings leading to the different air conditioning zones Air streams. In particular, the segmentation of the radiator according to the embodiment of FIG. 1 can be a space-saving realize air conditioning that the increasing comfort needs does justice. Alternatively, however, can also be the same Comfort is ensured when according to the embodiment according to A conventional heater is used to FIG. 2. By arrangement are the air ducts and the mixing flap in the area of ​​the radiator achieves the same effects.

Alternatively, the radiator 4 with upright, vertical be formed tubes. This is an automatic temperature stratification achieved, whereby the temperature of the coolant uniformly from one area to height of the inlet opening 18 in the direction of the height of the end tubes at the top and bottom of the Radiator 4 arranged outlet openings decreases. Through this Action is particularly the footwell channel 7 of the front space a higher temperature than the ventilation duct 5 associated thereof. In Similarly, the adjacent inlet opening and close footwell channel 10 of the back space with an air flow higher temperature as applied to the ventilation channel 11 of the rear space.