EP0257017B1 - Air conditioning and ventilating device - Google Patents

Description

The invention relates to an air conditioning and ventilation device, consisting of a housing for installation in a wall, window, facade or the like. according to the preamble of claim 1.

Known and commercially available air conditioners are designed in such a way that they only work in recirculation mode, ie the used room air is re-used after cooling or heating returned to the room. In order to allow outside air to get into the room to be conditioned, these air conditioners usually have manually operated ventilation openings or devices,
through the max. 10-15% outside air can be added. In order for more than 15% outside air to get into the interior, additional ventilation devices must generally be installed.

Such a device is known for example from DE-A 29 05 884, wherein the heat exchangers can be operated either as a condenser or as an evaporator.

A major disadvantage of this device design is that, depending on the usual installation situation, these supply air and exhaust air openings usually remain open when the device is switched off and therefore, e.g. in winter, cold air can enter the interior unhindered and cause unpleasant drafts.

It is also important with these devices that, due to the low outside air rate, room cooling, even at low outside temperatures, in rooms with high internal heat development (computer rooms and the like) can only take place with the help of the compressor cooling.
DE-A 33 15 444 discloses a device for ventilating and heating interiors, in particular living quarters, in which an air duct is provided for the interior air and an air duct for the outside air, with two flaps adding outside air to the inside air and inside air to the outside air can be. In the air duct for the indoor air, a heat exchanger with a fan working as a condenser is arranged, while in the air duct for the outside air, a heat exchanger with a fan working as an evaporator is arranged. In addition, a third heat exchanger is provided, which enables a heat exchange between the admixed inside air and the admixed outside air. The arrangement of the flaps in front of the third heat exchanger enables three operating modes, namely heating the internal air passed through the condenser in one end position of the flaps, heating the outside air via the condenser in the other end position the flaps with simultaneous heat exchange between indoor and outdoor air via the third heat exchanger, and a mixed operation between these two operating modes in an intermediate position of the flaps. The arrangement of the third heat exchanger is complex and requires additional space.

Furthermore, it has the disadvantage that even in the operating mode of heating the indoor air, part of this indoor air comes into contact with the third heat exchanger and thus an undesirable heat exchange takes place with the colder outside air, which can also come into contact with the third heat exchanger. This increases the time and energy required to heat the indoor air.

The object of the invention is to create a new air conditioning and ventilation device which excludes the disadvantages of the known device designs mentioned, in which it is possible to keep the contamination of the heat exchanger low, and in particular to achieve a smaller dimensioning of the heat exchanger in the second air duct, as well as to achieve a higher air flow rate for the extraction of the interior air in the second air duct, the same amount of interior air to be extracted to the outside in the ventilation mode as the outside air is blown inwards in the first air duct.

The air conditioning and ventilation device according to the invention is characterized by the features of the claims.

Because the internal air in the second air duct is not passed over the heat exchanger of the same, the heat exchanger can be made smaller with the same heat transfer capacity. In addition, the direct supply of the indoor air to the blower achieves a higher air flow rate with the same blower output than if the indoor air were passed through the heat exchanger (higher air resistance through the heat exchanger). In addition, the heat exchanger cannot be contaminated by the indoor air. Due to the partial covering of the heat exchanger by the flap, more indoor air than outside air is sucked out of the blower, so that in the exclusive ventilation mode with the compressor switched off, the same amount of inside air is sucked out to the outside as outside air is blown in through the first air duct.

Due to the radial fan and the suction side arrangement of the same after the heat exchangers, the latter are fully impacted by the air flow and ventilation ducts with a relatively large length can be connected to the air inlets and air outlets. The mixing chamber enables intensive mixing of the indoor and outdoor air. In addition to an exclusive recirculation mode for cooling or heating, an additional, controllable supply of outside air to pure supply air mode and / or pure exhaust air mode with only two heat exchangers is possible, with all connection openings to the outside air being automatically sealed off when the device is switched off.

To prevent contamination of the heat exchanger in the first air duct, an air filter is arranged in front of the heat exchanger.

A first embodiment of a device for adjusting the mixing ratio between inside and outside air in the first air duct is characterized in that a first flap is arranged in the area of the mixing chamber after the first inside air inlet and in front of the heat exchanger and that in the area after the first outside air inlet and one in front of the heat exchanger second flap is arranged, the first flap being mechanically coupled to the second flap via a linkage, so that when the first flap is open the second flap is closed and vice versa.

A second embodiment of a device for adjusting the mixing ratio between inside and outside air in the first air duct is characterized in that the mixing chamber is provided with a flap in front of the heat exchanger of the first air duct between the first inside air inlet and the first outside air inlet, the flap is rotatably mounted on a shaft on the wall of the mixing chamber.

A third embodiment of a device for adjusting the mixing ratio between inside and outside air in the first air duct is characterized in that between the inside and outside air the mixing chamber is provided with a flap in front of the heat exchanger of the first air duct between the first inside air inlet and the first outside air inlet is, the flap has the shape of a quarter circle and is rotatably mounted on a shaft which is arranged centrally in the inlet opening to the heat exchanger.

A fourth embodiment of a device for adjusting the mixing ratio between inside and outside air in the first air duct is characterized in that the mixing chamber is provided with a flap in front of the heat exchanger of the first air duct between the first inside air inlet and the first outside air inlet, the flap in the manner of a throttle valve is rotatably mounted in the middle of the mixing chamber on a shaft, from which a continuous web leads to the wall of the mixing chamber

A fifth embodiment of a device for adjusting the mixing ratio between indoor and outdoor air in the The first air duct is characterized in that the mixing chamber is provided with a flap in front of the heat exchanger of the first air duct between the first inside air inlet and the first outside air outlet, the flap being rotatably mounted in the middle of the mixing chamber on a shaft in the manner of a throttle valve, and has a semicircular part which bears against the wall of the mixing chamber.

All of the embodiments of the device for setting the mixing ratio between inside and outside air in the first air duct have a simple structure that ensures trouble-free function. The mixing chamber enables intensive mixing of the indoor and outdoor air.

The flaps, slides, blinds or the like are advantageously continuously adjustable by means of a servomotor.

Each blower is attached with the associated heat exchanger and mixing chamber as a compact unit on a floor pan, so that the unit can be easily replaced for service or repair.

A heater is arranged between the heat exchanger and the fan of the first air duct, which increases the heating output in the event of low outside temperatures.

Fig. 1

einen Grundriß des Gerätes ohne Gehäuse und teilweise im Schnitt,

Fig.2

die Vorderwand des Gerätes,

Fig. 3

die Rückwand des Gerätes,

Fig. 4

eine schematische Darstellung des Kühlmittelkreislaufs und der Luftführungen innerhalb des Gerätes,

Fig.5

bis 9 Varianten der ersten Luftführung des Gerätes in schematischer Darstellung,

Fig. 10

eine Vorderansicht des erfindungsgemäßen Klima- und Lüftungsgerätes mit abgenommener Vorderwand in perspektivischer Darstellung, und

Fig.11

eine Rückansicht des Gerätes nach Fig. 1 in perspektivischer Darstellung.

Further details of the invention are described below with the aid of the drawing. Show it

Fig. 1

a plan of the device without housing and partly in section,

Fig. 2

the front wall of the device,

Fig. 3

the rear wall of the device,

Fig. 4

a schematic representation of the coolant circuit and the air ducts within the device,

Fig. 5

up to 9 variants of the first air flow of the device in a schematic representation,

Fig. 10

a front view of the air conditioning and ventilation device according to the invention with the front wall removed in a perspective view, and

Fig. 11

a rear view of the device of FIG. 1 in a perspective view.

In Figs. 10 and 11, 1 denotes a housing with the front wall 2 removed, which is directed toward the interior in the assembled state, so that the individual device components are easily accessible, or that the components fastened on a floor pan 3 can be used as a compact machine set in the housing and are removable. Here, the individual components are arranged side by side in such a way that, with a relatively low overall depth and height, there is an overall length of the housing which corresponds, for example, to the installation dimensions of standardized windows. The housing itself can be extended to any desired size from a technically required minimum length. Through this variable In terms of construction, a dimensional adjustment to architectural specifications is possible.

1 and 10, an air inlet 4 is provided on the far left for the inside air, which corresponds to an inlet opening 4ʹ in the front wall 2 (Fig.2) and continues as a supply air mixing chamber 5 and ends there in an air inlet 6 for the outside air (Fig.11). A channel 7 leads from the air inlet 6 to the corresponding inlet opening 6ʹ in the rear wall 8 (FIG. 3). At both air inlets 4 and 6, a return air flap 9 and an outside air flap 10 are arranged, which are rotatably mounted on vertical shafts 11 and 12. At the upper end of the shafts 11 and 12, pivot levers 13 and 14 are fastened, which are articulated via a connecting rod 15, so that when one shaft rotates, the other shaft is also rotated. The shaft 11 is connected above the pivot lever 13 to the drive shaft of a servo motor 11ʹ, which enables a simultaneous, constant change in direction of the flaps 9 and 10. The flaps operate in such a way that the flap 9 is closed when the flap 10 is open and vice versa, any intermediate positions of the flap 9 and 10 being possible. The supply air mixing chamber 5 continues to the right into a channel which is formed by a first heat exchanger 16 and contains coils 17 with heat conducting plates 18. Between the air inlets 6ʹ and 6, the outside air for the admixture to the return air in the duct 7 sweeps over outer bends of the coils 17 of the heat exchanger 16 and is already preconditioned before entering the supply air mixing chamber 5.

An air filter 19 is arranged in front of the heat exchanger 16 (FIGS. 1, 10). The heat exchanger 16 is followed by a short heating duct 20 in which an electric heater 21 (FIG. 1) is installed. A fan 22 in the form of a radial fan is installed on the heating duct 20, the outlet opening 23 of which is directed upwards and opens into a trough 24 which is closed on three sides and is open to the front in order to form an air outlet 25 which extends into a corresponding outlet opening 26 in the front wall 2 of the housing 1 continues (Fig.2).

The trough 24 has a V-shaped air baffle 27 in the middle and two obliquely arranged air baffles 28 for wide-area air distribution. In front of the outlet opening 26 are adjustable baffles 26ʹ through which the air flow can be steered in any direction. The air-guiding trough 24 and the guide plates 27 and 28 are clad with sound-absorbing material, as a result of which the lowest possible operating noise is achieved. The inside air is sucked in by the blower 22 through the air inlets 4, 4 'through the supply air mixing chamber 5, the heat exchanger 16 and the heating duct 20 and is returned to the room via the tub 24 and its air outlet 25 and the outlet opening 26. A variable proportion of outside air of 0-100% can be added via the outside air flap 10.

The supply air mixing chamber 5, the heat exchanger 16 and the heating duct 20, and the blower 22 form a first compact ventilation unit which is mounted in the left area of the floor pan 3.

A second compact ventilation unit, consisting of a heat exchanger 29, an exhaust air mixing chamber 30 and a blower 31, is mounted in the right area of the floor pan 3.

In cooling mode, the heat exchanger 29 works as a condenser and the heat exchanger 16 as an evaporator, while in the heat pump mode, the heat exchanger 29 works as an evaporator and the heat exchanger 16 as a condenser. The second ventilation unit enables heat to be removed from the heat exchanger (condenser) 29 in cooling mode and heat absorption in heating mode (heat pump). A compressor 32 is mounted between the two ventilation units in the central region of the floor pan 3 and is connected to the two heat exchangers 16, 29 via coolant lines, as will be explained in more detail later with reference to FIG. 6. The outside air is drawn in by the blower 31 via an air inlet 33 in the rear wall 8 of the housing 1 (FIG. 3), the heat exchanger 29 and via the exhaust air mixing chamber 30, bypassing the compressor 32 and its coolant lines, and then passes through one Air outlet 34 in the rear wall 8 again Outside. The exhaust air mixing chamber 30 has an opening 35 at the top, which can be closed by an exhaust air flap 36. The exhaust air flap 36 is rotatably mounted on a horizontal shaft 37 which is connected to the drive axis of a further servomotor 37 '. The opening 35 merges into a corresponding opening in a trough 38 which is too open towards the front and continues as an air inlet 39 for the internal air in the front wall 2 of the housing 1 (FIG. 2). This arrangement enables an exhaust air operation in which the exhaust air flap 36 is completely opened by the servomotor 37 'and covers the heat exchanger (condenser) 29 on one side. As a result, internal air is additionally drawn in through the air inlet 39, the trough 38 and via the opening 35 into the exhaust air mixing chamber 30 and is conveyed to the outside by the fan 31.

Because the internal air in the second air duct is not passed over the heat exchanger of the same, the heat exchanger can be made smaller with the same heat transfer capacity. In addition, the direct supply of the indoor air to the blower achieves a higher air flow rate with the same blower output than if the indoor air were passed through the heat exchanger (higher air resistance through the heat exchanger). In addition, the heat exchanger cannot be contaminated by the indoor air. Due to the partial covering of the heat exchanger by the flap, more indoor air than outside air is sucked out of the blower, so that in the exclusive ventilation mode with the compressor switched off, the same amount of inside air is sucked out to the outside as outside air is blown in through the first air duct.

The arrangement of the blowers after the heat exchangers results in a uniform loading of the heat exchangers, which cannot be achieved with an arrangement on the pressure side.

In order to achieve optimal sound insulation, all air-carrying and other parts are lined with sound insulation material. To this Parts include the flaps 9, 10 and 36, the supply air mixing chamber 5, the exhaust air mixing chamber 30, the troughs 24 and 38, the baffles 27 and 28, and the entire inner surface of the housing 1. The flap is provided on both sides with the soundproofing material also for sealing when the device is switched off.

The switchover from cooling operation to heating operation (heat pump) takes place via an electromagnetically actuated reversing valve 40 (FIG. 4), which is arranged in the compressor 32.

A double pressure switch 41 is arranged at the heat exchanger 29 and is used for pressure monitoring on the high and low pressure side of the coolant circuit. The blower 31 has a switch box 42 with terminals, relays, fuses, etc., from which connecting cable to the servomotors 11 'and 37' to the blowers 22 and 31, to the radiator 18, to the compressor 38, to the reversing valve 40 and to the pressostat 41. Control lines lead from the control box 42 to a central operating device (not shown), which contains a microprocessor which carries out the control functions and monitors the device.

The control unit is attached to a suitable location in the interior and contains a number of function keys for selecting the individual operating modes, such as COOLING, HEATING, El.HEAT, AIRMIX, FRESHAIR, EXHAUST, FREECOOLING and OFF. Furthermore, a thermistor-controlled temperature electronics with temperature selector for setting the desired room temperature and a speed selector for the blowers for setting the desired air volume. A 4-stage control of the speed and thus the air volume is preferably carried out. Furthermore, the control unit is provided with an optical fault display. The central control unit can also be used to control several air conditioning and ventilation units together.

The schematic representation of the coolant circuit and the air duct according to FIG. 4 shows, for example, the cooling operation. The coolant heated by the compressor 32 passes through the reversing valve 40 to the heat exchanger (condenser) 29 and from there via a throttle element 43 e.g. in the form of a capillary tube to the heat exchanger (evaporator) 16. The coolant is returned from the heat exchanger 16 via the reversing valve 40 to the suction side of the compressor 32. The inside, mixed or outside air guided through the heat exchanger 16 depending on the preselected mode of operation is cooled by releasing the heat required for the evaporation of the refrigerant, while the heat absorbed by the coolant is given off to the outside air via the heat exchanger 29.

If the reversing valve 40 is switched over to switch to heating operation, the functions of the heat exchangers are reversed, ie the heat exchanger 16 works as a condenser and the heat exchanger 29 as an evaporator.

To evaporate the condensate, the hot coolant line emerging on the high-pressure side of the compressor 32 is led down to the bottom trough 3 and is laid there in a serpentine manner in contact with the bottom trough 3 in order to achieve the greatest possible evaporation of the condensation water collecting in the bottom trough 3. To hold the hot coolant line on the floor pan 3, or to improve the thermal contact, this coolant line is connected to the floor pan 3 by means of silicone rubber. In the floor pan 3 there is also an outlet connection (not shown) as a safety drain for any excess condensate water.

• A) COOLING (Kühlen im Umluftbetrieb):
  Bei Betätigung der Taste COOLING wird die Rückluftklappe 9 voll geöffnet und die Außenluftklappe 10 geschlossen, sodaß nur Innenluft angesaugt, gefiltert und gekühlt in den Innenraum ausgeblasen wird. Die Abluftklappe 36 ist geschlossen.
• B) COOLING mit AIRMIX (Kühlen im Mischluftbetrieb):
  Wird zusätzlich die Taste AIRMIX gedrückt, so wird die Rückluftklappe 9 teilweise geschlossen und die Außenluftklappe 10 teilweise geöffnet, während die Abluftklappe 36 geschlossen bleibt. Somit gelangt ein gefilterter Außenluftanteil variabel von 0 - 100% wählbar zur Innenluft. Vorzugweise wird ein Außenluftanteil von bis zu 25% eingestellt.
• C) HEATING Wärmepumpenschaltung im Umluftbetrieb):
  Durch Betätigung der Taste HEATING erfolgt eine Umschaltung des Umkehrventiles 40, wobei der Kältekreislauf in eine sogenannte Wärmepumpenschaltung übergeht. Die Stellung der Klappen 9,10 und 36 wird wie unter Punkt A) beibehalten.
• D) HEATING mit AIRMIX (Wärmepumpenheizung im Mischluftbetrieb):
  Wird zusätzlich die Taste AIRMIX gedrückt, so erfolgt die automatische Einstellung der Klappen wie unter Punkt B) näher beschrieben.
• E) HEATING + EL.HEAT (Wärmepumpenheizung + Elektroheizung):
  Wird zur Taste HEATING die Taste EL.HEAT gedrückt, so wird der Heizkörper 21 hinzugeschaltet. Die Stellungen der Klappen 9,10 und 36 bleiben wie unter Punkt A) und bei Stellung AIRMIX wie unter Punkt B) näher beschrieben.
• F) EL.HEAT (Elektronheizung um Umluftbetrieb):
  Wird nur die Taste EL.HEAT gedrückt, so wird der Kompressor 32 und das Gebläse 31 ausgeschaltet, während das Gebläse 22 und der Heizkörper 21 eingeschaltet werden. Die Stellungen der Klappen 9,10 und 36 bleiben wie unter Punkt A) näher beschrieben.
• G) EL.HEAT mit AIRMIX (Elektroheizung im Mischluftbetrieb):
  Durch zusätzliche Betätigung der Taste AIRMIX werden die Betriebszustände wie unter Punkt F) und die Stellung der Klappen 9,10 und 36 wie unter Punkt B) näher beschrieben, automatisch augesteuert.
• H) FRESHAIR (Zuluft):
  Durch Betätigung der Taste FRESHAIR wird der Kompressor 32, das Gebläse 31 und der Heinzkörper 21 ausgeschaltet, während das Gebläse 22 eingeschaltet wird. Die Rückluftklappe 9 wird geschlossen und die Außenluftklappe 10 geöffnet, während die Abluftklappe 36 geschlossen wird, wodurch ausschließlich Außenluft gefiltert in den Innenraum gelangt.
• I) EXHAUST (Abluft):
  Durch Betätigung der Taste EXHAUST wird der Kompressor 32, das Gebläse 22 und der Heizkörper 21 ausgeschaltet, das Gebläse 31 wird eingeschaltet. Die Rückluftklappe 9 wird geöffnet und die Außenluftklappe 10 geschlossen, während die Abluftklappe 36 geöffnet wird, sodaß verbrauchte Innenluft nach außen abgesaugt wird.
• J) FRESHAIR und EXHAUST
  Durch gleichzeitige Betätigung der Tasten FRESHAIR und EXHAUST wird der Kompressor 32 und der Heizkörper 21 ausgeschaltet; das Gebläse 22 und das Gebläse 31 werden eingeschaltet. Die Rückluftklappe 9 wird geschlossen und die Außenluftklappe 10 und die Abluftklappe 36 geöffnet, sodaß einerseits gefilterte Außenluft in den Innenraum gelangt und anderseits die verbrauchte Innenluft nach außen abgesaugt wird.
• K) FREECOOLING
  Durch Betätigung der Taste FREECOOLING wird im Bedienungsgerät eine elektronische Vergleichsmessung zwischen Innen- und Außentemperatur freigegeben. Diese bewirkt ein selbsttätiges Einschalten der Zuluft und Abluft, wie unter Punkt J) näher beschrieben, dies insbesondere, wenn die Außentemperatur um einen vorgegebenen Wert niedriger als die Innentemperatur ist. Bei Angleichung der Innentemperatur an die Außentemperatur wird die Zuluft- und Abluftfunktion wie unter Punkt L) näher beschrieben, automastisch abgestellt.
• L) OFF
  Wird die Taste OFF gedrückt, so werden neben der Abschaltung sämtlicher elektrisch betriebener Elemente die Außenluftklappe 10 und die Abluftklappe 36 geschlossen, während die Rückluftklappe 9 geöffnet wird. Heidurch wird vermieden, daß kalte Zugluft von außen in den Innenraum gelangen kann.

The arrangement of the flaps 9, 10 and 36 with the associated inlet or. Outlet openings, as well as the radiator 21, result from operating one or more of the function keys COOLING, HEATING, El.HEAT, AIRMIX, FRESHAIR, EXHAUST, FREECOOLING, OFF on the operating device:

• A) COOLING:
  When the COOLING button is pressed, the return air flap 9 is fully opened and the outside air flap 10 is closed, so that only inside air is sucked in, filtered and cooled and blown out into the interior. The exhaust flap 36 is closed.
• B) COOLING with AIRMIX (cooling in mixed air mode):
  If the AIRMIX button is also pressed, the return air flap 9 is partially closed and the outside air flap 10 is partially opened, while the exhaust air flap 36 remains closed. This means that a filtered proportion of outside air reaches the inside air in a variable manner from 0 - 100%. An outside air fraction of up to 25% is preferably set.
• C) HEATING heat pump circuit in recirculation mode):
  By pressing the HEATING button, the reversing valve 40 is switched over, the refrigeration cycle changing into a so-called heat pump circuit. The position of the flaps 9, 10 and 36 is as in point A) maintained.
• D) HEATING with AIRMIX (heat pump heating in mixed air mode):
  If the AIRMIX button is also pressed, the flaps are automatically set as described in point B).
• E) HEATING + EL.HEAT (heat pump heating + electric heating):
  If the EL.HEAT key is pressed for the HEATING key, the radiator 21 is switched on. The positions of the flaps 9, 10 and 36 remain as described in point A) and in the AIRMIX position as described in point B).
• F) EL.HEAT (electron heating for air circulation):
  If only the button EL.HEAT is pressed, the compressor 32 and the fan 31 are switched off, while the fan 22 and the heating element 21 are switched on. The positions of the flaps 9, 10 and 36 remain as described under point A).
• G) EL.HEAT with AIRMIX (electric heating in mixed air mode):
  By additionally pressing the AIRMIX button, the operating states as described under point F) and the position of the flaps 9, 10 and 36 as described under point B) are automatically controlled.
• H) FRESHAIR (supply air):
  By pressing the FRESHAIR button, the compressor 32, the fan 31 and the Heinz body 21 are switched off while the fan 22 is switched on. The return air flap 9 is closed and the outside air flap 10 is opened, while the exhaust air flap 36 is closed, as a result of which only outside air is filtered into the interior.
• I) EXHAUST (exhaust air):
  By pressing the EXHAUST key, the compressor 32, the blower 22 and the heating element 21 are switched off, the blower 31 is switched on. The return air flap 9 is opened and the outside air flap 10 is closed, while the exhaust air flap 36 is opened, so that used inside air is extracted to the outside.
• J) FRESHAIR and EXHAUST
  By pressing the FRESHAIR and EXHAUST buttons simultaneously, the compressor 32 and the radiator 21 are switched off; the blower 22 and blower 31 are turned on. The return air flap 9 is closed and the outside air flap 10 and the exhaust air flap 36 are opened so that, on the one hand, filtered outside air enters the interior and, on the other hand, the used inside air is extracted to the outside.
• K) FREECOOLING
  By pressing the FREECOOLING key, an electronic comparison measurement between the inside and outside temperature is enabled in the control unit. This causes the supply air and extract air to be switched on automatically, as described in more detail under point J), in particular if the outside temperature is lower than the inside temperature by a predetermined value. When the inside temperature is adjusted to the outside temperature, the supply and extract air functions are automatically switched off as described in point L).
• L) OFF
  If the OFF key is pressed, in addition to the switching off of all electrically operated elements, the outside air flap 10 and the exhaust air flap 36 are closed while the return air flap 9 is opened. This will prevent cold drafts from entering the interior from the outside.

The control unit also includes an internal electronic locking circuit that prevents multiple buttons, e.g. HEATING and COOLING, faulty or illogical operating modes are triggered that do not fall under the operating modes listed above.

As can be seen in FIGS. 2 and 3, all the air inlet or outlet openings are arranged in the plane of the front wall 2 or the rear side 8 of the housing 1, which advantageously means that no lateral openings in the housing are required, which are taken into account during installation should be. The installation of any necessary air duct on the housing 1 is also significantly facilitated by this measure, the entire opening area being adaptable to the speed gradations of the amount of air required in each case.

As can be seen from FIG. 10, a plate 44 is attached behind the front wall 2 for safety reasons, after its removal only access to the units or components of the device is made possible.

In the illustrated embodiment according to FIGS. 1 and 10, two flaps 9 and 10 are used to adjust the mixing ratio between inside and outside air. 5 and 7 show further exemplary embodiments, each with only one flap, which is arranged rotatably about a vertical shaft 46 in the mixing chamber 5 in front of the heat exchanger 16 between the air inlet 4 for the inside air and the air inlet 6 for the outside air.

5, the flap 45 is fastened to the wall of the mixing chamber 5 so that it can rotate about the shaft 46.

6, the flap 47 has the shape of a quarter circle, the shaft 46 being arranged centrally in the inlet opening to the heat exchanger 16.

In Fig. 7, a flap 48 is provided in the manner of a throttle valve, which is arranged rotatably in the middle of the mixing chamber 5 about the shaft 46, a continuous web 49 being provided as a lock between the shaft 46 and the wall of the mixing chamber 6, which a prevents unwanted mixing of indoor and outdoor air in this area.

Fig. 8 shows similar flap 50 as in Fig. 7, wherein instead of the web 49, a semicircular part 51 is arranged on the flap 50, which abuts the wall of the mixing chamber 5 and takes over the locking function.

Fig. 9 shows a variant in which the flaps 9 and 10 are replaced by sliders 52 and 53 and which are actuated by a rotary link 54, which outside the mixing chamber 5 is arranged rotatably about a shaft 46ʹ. Ultimately, the flaps 9 and 10 or the like by adjustable blinds. be replaced.

Claims (12)

1. An air conditioning and ventilating device, comprising a housing (1) for fitting into a wall, window, facade or the like, having a first air path for drawing in internal and external air and for blowing both types of air via a fan (22) out towards the inside, a second air path for drawing in external and internal air and for blowing both types of air via a fan (31) out towards the outside, flaps or the like for adjusting the mixing ratio of internal to external air being provided in both the first and second air paths, and heat exchangers (16, 29) being provided in both the first and second air paths, which heat exchangers are connected via cooling medium lines and a throttling member (43) with a compressor (32), a mixing chamber (5) being provided in the first air path between the air inlets (4, 4'; 6, 6') for internal and external air and the heat exchanger (16) and at least one adjustable element (9, 10; 45; 47; 48; 50; 52, 53), for example flaps, slide elements, blinds or the like for adjusting the mixing ratio of internal to external air being arranged in the first air path in the region of the mixing chamber (5) and upstream of the beat exchanger (16) and both the internal and external air being guided through the heat exchanger arranged in the first air path and an exhaust air mixing chamber (30) being provided in the second air path, and in its closed state a flap (36) or the like closes a suction opening in the exhaust air mixing chamber (30) for the internal air, characterised in that only external air is guided in the second air path via the heat exchanger (29) of said second air path into the exhaust air mixing chamber (30), and the flap (36) or the like for adjusting the mixing ratio in the second air path is arranged between the heat exchanger (29) and the exhaust air mixing chamber (30), and in its open state at least partially covers the heat exchanger (29) of the second air path, and both heat exchangers (16 and 29) can be selectively operated by means of a reversing valve (40) as an evaporator or condenser, it being possible to switch off the compressor (32) for ventilation operation.
2. An air conditioning and ventilating device according to claim 1, characterised in that the fans (22, 31) are designed as radial fans and are arranged between air outlets (26, 34) and the heat exchangers (16, 29).
3. An air conditioning and ventilating device according to claim 2, characterised in that an air filter (19) is arranged in the first air path upstrem of the heat exchanger (16).
4. An air conditioning and ventilating device according to claim 1, characterised in that a first flap (9) is arranged in the first air path in the region downstream of the first internal air inlet (4, 4') and upstream of the beat exchanger (16) and a second flap (10) is arranged in the region downstream of the first external air inlet (6, 6') and upstream of the heat exchanger (16), the first flap (9) being mechanically coupled with the second flap (10) via a rod system (13, 14, 15), so that when the first flap (9) is open, the second flap (10) is closed and vice versa.
5. An air conditioning and ventilating device according to claim 1, characterised in that for adjusting the mixing ratio of internal to external air, the mixing chamber (5) is provided with a flap (45) upstream of the heat exchanger (16) of the first air path between the first internal air inlet (4, 4') and the first external air inlet (6, 6'), the flap (45) being rotatably secured on a shaft (46) to the wall of the mixing chamber (5).
6. An air conditioning and ventilating device according to claim 1, characterised in that for adjusting the mixing ratio of internal to external air, the mixing chamber (5) is provided with a flap (47) upstream of the heat exchanger (16) of the first air path between the first internal air inlet (4, 4') and the first external air inlet (6, 6'), the flap (47) having the shape of a quarter-circle and being rotatably secured on a shaft (46), which is arranged centrally in the inlet opening to the heat exchanger (16).
7. An air conditioning and ventilating device according to claim 1, characterised in that for adjusting the mixing ratio of internal to external air, the mixing chamber (5) is provided with a flap (48) upstream of the heat exchanger (16) of the first air path between the first internal air inlet (4, 4') and the first external air inlet (6, 6'), the flap (48) being rotatably secured in the manner of a throttle valve on a shaft (46) in the centre of the mixing chamber (5), a continuous web (49) leading from said shaft (46) to the wall of the mixing chamber (5).
8. An air conditioning and ventilating device according to claim 1, characterised in that for adjusting the mixing ratio of internal to external air, the mixing chamber (5) is provided with a flap (50) upstream of the heat exchanger (16) of the first air path between the first internal air inlet (4, 4') and the first external air inlet (6, 6'), the flap (50) being rotatably secured in the manner of a throttle valve on a shaft (46) in the centre of the mixing chamber (5) and comprising a semi-circular section (51), which rests against the wall of the mixing chamber (5).
9. An air conditioning and ventilating device according to claim 1, characterised in that for adjusting the mixing ratio a first slide element (53) is arranged in the first air path in the region downstream of the first internal air inlet (4, 4') and upstream of the beat exchanger (16), and a second slide element (52) is arranged in the region downstream of the first external air inlet (6, 6') and upstream of the heat exchanger (16), the slide elements (52, 53) being mechanically coupled via a rod system (54), so that when the first slide element (53) is open, the second slide element (52) is closed and vice versa.
10. An air conditioning and ventilating device according to one of claims 4 to 9, characterised in that flaps, slide elements, blinds or the like (9, 10; 45; 47; 48; 50, 52, 53) are adjustable at all times by means of an adjusting motor (11').
11. An air conditioning and ventilating device according to claim 1, characterised in that a heating element (21) is arranged between the heat exchanger (16) and the fan (22) of the first air path.
12. An air conditioning and ventilating device according to claim 1, characterised in that the fan (22) is secured with the associated heat exchanger (16) and mixing chamber (5) as a compact unit on a base pan (3).

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