Air conditioning system with bypass device and procedure

Abstract

Air conditioning system (1) for a vehicle, comprising a blower (2) for drawing in air (12), an evaporator (3) for cooling at least a portion of the drawn-in air (12), a mixing chamber (4) adjoining the evaporator downstream, and a bypass device for diverting a portion of the drawn-in air (12) past the evaporator (3) into the mixing chamber (4), characterized in that the bypass device comprises a first bypass channel (5) with a first air flap (6) and a second bypass channel (7) with a second air flap (8) and is configured to regulate a first airflow through the first bypass channel (5) and a second airflow through the second bypass channel (7) separately by means of the first air flap (6) and the second air flap (8), wherein the bypass device is provided with outlet openings (10, 11) and the first bypass channel (5) and the second bypass channel (7) are designed such thatthat the first airflow is directed through the first bypass channel (5) on a first, left or right, side relative to the evaporator (3) and the second airflow is directed through the second bypass channel (7) on a second, opposite side to the first, side through the outlet openings (10, 11) into the mixing chamber (4), wherein the outlet openings (10, 11) are arranged on both sides behind the evaporator (3) over the entire height of the evaporator (3).

Description

Technical FieldThe invention relates to an air conditioning system for a vehicle according to the preamble of claim 1 or of claim 2.Prior ArtThe use of air conditioners in automobiles is known. In particular, conventional air conditioners have an evaporator which extracts heat from the air and thus effects cooling. Depending on the power, the air conditioning system can cause a not negligible proportion of the fuel consumption or energy consumption of the vehicle. In order to operate an air conditioning system in an energy-efficient manner, a portion of the drawn-in air should be conducted past the evaporator as a function of the instantaneous setting of the air conditioning system.In order to direct a portion of the drawn-in air past the evaporator, a bypass air path is provided around the evaporator. Known solutions are specified, for example, in the publications DE 10 2005 048 910 A1 and EP 2 450 204 A2.In this case, DE 10 2005 048 910 A1 discloses a bypass duct provided with an air flap being led past the air filter and evaporator.Furthermore, EP 2 450 204 A2 discloses a bypass duct having at least one transverse duct adjoining the bypass duct, wherein the transverse duct extends along the longitudinal extent of the evaporator. The bypass channel and / or the transverse channel can have an air flap. A disadvantage of the known solutions is that an individual bypass duct at the top or at the bottom results in an unequal air quantity distribution. Possible corrective measures for this usually have an acoustically negative influence. A channel (or transverse channels) which is guided as far as behind the evaporator again result in a blocking of the air path and thus have a negative influence on the flow pattern.GB 2 314 919 A discloses an air conditioning system having an air conditioning housing with an evaporator, wherein above and below the evaporator a bypass duct is provided which allows air to flow past the evaporator, wherein a valve is arranged in both bypass ducts for controlling the air flow through the respective bypass duct.JP 2011-111 094 A discloses an air conditioning system having an air conditioning housing with an evaporator, wherein a bypass duct is provided above the evaporator, which allows air to flow past the evaporator.U.S. Pat. No. 6,520,850 B1 discloses an air conditioning system having an air conditioning housing with an evaporator and a heating body, wherein flaps are provided downstream of the heating body, which flaps have arcuate guide elements.DE 38 26 182 C1 discloses a heating and ventilation device with a housing with a heating body, wherein a flap is provided, which has tube parts.JP 2012-153 223 A discloses an air conditioning system having an air conditioning housing with an evaporator, wherein a bypass duct is provided below the evaporator, which allows air to flow past the evaporator.KR 10 1010 0 009 211 A discloses an air conditioning system having an air conditioning housing with an evaporator and with a heating body, wherein the evaporator and heating body are arranged one after the other in their longitudinal direction in a line.JP S57-15 010 A discloses an air conditioning system having an air conditioning housing with an evaporator, wherein a bypass duct is provided above and below the evaporator, which allows air to flow past the evaporator.Presentation of the Invention, Object, Solution, AdvantagesIt is the object of the invention to provide an air conditioning system in which the above-mentioned disadvantages are avoided. In particular, an energy-efficient air conditioning system is to be provided which has a uniform air distribution with an optimum flow pattern in a mixing space. A method in this respect is also intended to be provided.The object of the air conditioning system is achieved with the features of claim 1. An exemplary embodiment of the invention relates to an air conditioning system for a vehicle having a blower for suctioning air, an evaporator for cooling at least a part of the suctioned air, a mixing space adjoining the evaporator downstream of the air stream, and having a bypass device for guiding a part of the suctioned air past the evaporator into the mixing space. The bypass device has a first bypass duct with a first air flap and a second bypass duct with a second air flap and is configured to separately regulate a first air flow through the first bypass duct and a second air flow through the second bypass duct by means of the first air flap and the second air flap.The object of the air conditioning system is also achieved with the features of claim 2.An exemplary embodiment of the invention relates to an air conditioning system for a vehicle, having a blower for suctioning air, an evaporator for cooling at least a part of the suctioned air, a mixing space adjoining the evaporator downstream of the air flow, and a bypass device for guiding a part of the suctioned air past the evaporator into the mixing space, characterized in that the bypass device has a first bypass duct and a second bypass duct having a common air flap and is configured to regulate a first air flow through the first bypass duct and a second air flow through the second bypass duct by means of the air flapThere is further provided a method comprising the steps of claim 9 or claim 10. Accordingly, an air conditioner is operated which has a blower for drawing in air, an evaporator, a mixing space arranged behind the evaporator, and a bypass device having a first bypass channel and a second bypass channel which are guided to different sides of the mixing space and with which a part of air is guided past the evaporator. According to the method, a first air flow through the first bypass duct by means of a first air flap of the first bypass duct and a second air flow through the second bypass duct by means of a second air flap of the second bypass duct are regulated in such a way that, irrespective of a different pressure drop in the first bypass duct and in the second bypass duct, in each case an identical air mass flow is introduced into the mixing space of the two.It is thus clearly stated that an air conditioning system with an improved bypass device is provided, in which the air to be diverted past the evaporator is advantageously tapped between the blower and evaporator via two independent flaps. The branched-off air is then guided past the evaporator via two separate bypass ducts.An advantage of the invention is seen in the fact that a larger channel cross section can be achieved compared to the bypass solutions of the prior art. Furthermore, a better or more uniform air quantity distribution can be achieved and the air is better mixed behind the evaporator. This is achieved in particular in that the air flows can be influenced better or guided more precisely on account of the fact that two separate bypass ducts are used, which are controlled separately. Because the mass flow components can be controlled individually by the evaporator and by the bypass ducts on account of the separately adjustable louvers, mass flow compensation can be carried out comfortably on the right or left in the case of different duct pressure drops.According to the invention, the bypass device is provided with such outflow openings and the first bypass channel and the second bypass channel are designed such that the first air flow via the first bypass channel on a first, in particular left or right, side and the second air flow via the second bypass channel on a second side opposite the first side are guided through outflow openings into the mixing space.According to the invention, the outflow openings, more precisely the outflow openings behind the evaporator, are arranged on both sides, that is to say on the left and on the right, over the entire height of the evaporator on the sides of the mixing space.The air quantity distribution on the left and right and also on the top and bottom can thus be further improved.According to a particular embodiment, the air conditioning system has at least one chimney or a chimney-like outflow part running from top to bottom and adjoining the mixing space, wherein the outflow openings are provided on the second side by the chimney-like outflow part. It is preferred here that, for example, the second bypass duct is guided at the top or bottom past the evaporator and opens into the chimney-like outflow part.The structural design of the air conditioning system can thus be suitably adapted in a particularly simple manner, in particular with regard to its dimensions and the space requirement in the vehicle, with simultaneously the most optimum air path guidance possible.According to another preferred exemplary embodiment of the invention, the first bypass duct supplies the side close to the fan with outflow openings. In other words, the aforementioned first side with outflow openings which is assigned to the first bypass duct is arranged close to the fan. Furthermore, the first bypass duct is arranged in an installation space which lies between the blower, in particular the blower and / or an associated air filter arranged behind the blower, and the evaporator.This arrangement of the first bypass duct allows good utilization of the free space between the blower spiral and / or filter box on the one hand and the distributor housing on the other hand, which is generally present in asymmetric air conditioners.According to another very advantageous development of the invention, the bypass device is designed in such a way that the sizes of the outflow openings vary and become continuously smaller or larger in particular along a specific direction.In view of the fact that according to the invention the size of the outflow openings determines the mass flow distribution of the respective bypass air flow in terms of height, an air quantity distribution and air mixture which is further adapted to the type and shape of the air conditioning system can be achieved in this way.According to a particular exemplary embodiment, the first air flap and the second air flap are in particular mechanically coupled to one another. This is a preferred solution, in particular in variants with a correspondingly good geometric design of the bypass channels. The coupling of the louvers may be in a linear manner, but also in a non-linear manner, in which louvers are coupled to each other according to a transmission or reduction ratio.According to yet another advantageous refinement of the invention, the first air flap and / or the second air flap are each equipped with additional air guiding elements attached to the respective air flap. This makes it possible to achieve a further improvement in the control of the mass flow components, for example in order to conduct more air into the bypass duct with a higher pressure resistance.An exemplary embodiment of the invention relates to a method for operating an air conditioning system, wherein the air conditioning system has a blower for drawing in air, an evaporator, a mixing space arranged behind the evaporator, and a bypass device having a first bypass duct and a second bypass duct, which are guided to different sides of the mixing space and with which a part of air is guided past the evaporator, wherein a first air flow through the first bypass duct is regulated by means of an air flap of the first bypass duct and a second air flow through the second bypass duct is regulated by means of the air flap in such a way that, even in the presence of a respectively different pressure drop in the first bypass duct and in the second bypass duct, an identical air mass flow is respectively introduced into the mixing space through both bypass ducts.Further advantageous embodiments are described by the following description of the figures and by the dependent claims.Brief Description of the DrawingsThe invention is explained in more detail below on the basis of at least one exemplary embodiment with reference to the drawings. The following are shown: FIG. 1 is a schematic illustration of an air conditioning system with bypass device according to a particular exemplary embodiment of the invention, and. FIGS. 2 to 7 show different perspective views of a detail of an air conditioning system according to the invention, according to an exemplary embodiment of the invention.Preferred Embodiment of the InventionFIG. 1 shows an exemplary embodiment of an air conditioning system 1 according to the invention with bypass device. As shown in the schematic illustration in FIG. 1, the air conditioning system 1 has a blower 2 for suctioning air 12. The sucked-in air or the air flow is symbolized in the drawing in particular by the arrow which is provided with the reference sign 12. At this time, the air is sucked into an air duct 16 of the air conditioner 1. In the air duct 16, an air filter 13 for purifying the air is provided.The air duct 16 opens into an evaporator 3, by means of which the air is cooled. Connected to the evaporator 3 is a mixing space 4 and a distributor 14 having a number of outlets 17 through which the water can be discharged again into the passenger compartment of the vehicle.According to the invention, the air conditioning system 1 is equipped with a bypass device, The bypass device has in particular a plurality of bypass ducts 5, 7 and a plurality of outflow openings 10, 11 arranged on the mixing space 4, which are supplied by the bypass ducts 5, 7. The bypass ducts 5, 7 are guided separately from one another and are equipped with air flaps 6, 8, which can be controlled separately. Through the bypass ducts, at least a portion of the drawn-in air 12 is in each case introduced past the evaporator 3 directly into the mixing space 4.The invention now enables a particularly large duct cross section and a better air quantity distribution on the right / left and top / bottom as well as a better air mixture behind the evaporator, i.e. in the mixing chamber.According to the particular embodiment shown in FIG. 1, the bypass channels 5, 7 are designed such that they are guided to different sides of the mixing chamber 4. The first bypass duct 5 uses the otherwise free installation space 15 present between the blower 2 or air filter 13 and the evaporator 3 and thus branches off from the air duct 16 to the side of the mixing space 4 close to the blower in order to supply the outflow openings 11 there.The second bypass duct 7 is guided past the evaporator at the top or at the bottom and opens into a chimney or into a chimney-like outflow part 9, from which the side of the mixing space remote from the blower is supplied with outflow openings 10.It is preferred that the outflow openings 10, 11 are arranged as far as possible on both sides over the entire height of the evaporator 3 or mixing chamber 4. In this way, an optimum air quantity distribution and mixing of the bypass air and evaporator air can always be achieved in a particularly reliable manner.Although FIG. 1 shows that the second bypass duct 7, which is guided above or below the evaporator, branches off from the air duct 16 on the opposite side compared to the first bypass duct 5. However, the invention is not limited to such an embodiment. Thus, there are also other advantageous configurations in which the bypass ducts 5, 7 branch off on the same side of the air duct 16, in particular arranged one above the other, and / or both bypass ducts 5, 7 make use of the free installation space 15. The specific configuration of the bypass guide is dependent, inter alia, on the respective model of the air conditioning system and is accordingly adapted accordingly.In the exemplary embodiment shown here, the air conditioning system can run in an operating mode in which, thanks to the arrangement of the bypass ducts 5, 7 and their separate actuation, a substantial mass flow compensation of the air quantities flowing through the bypass ducts 5, 7 into the mixing chamber 4 is achieved. With a sufficiently good geometric design of the bypass channels 5, 7, a mutual coupling of the air flaps 6, 8 is also possible. Additional guide elements (not shown at this point) for controlling the mass flow fractions can be mounted on the air flaps. FIGS. 2, 3, 4, 5, 6 to 7 show different perspective views of a detail of an air conditioning system 1 according to the invention according to another exemplary embodiment. Reference numerals in FIGS. 2, 3, 4, 5, 6 to 7 correspond to those in FIG. 1 because they are the same or similar parts. It should also be noted that, for the sake of better view, the air conditioning system 1 in FIGS. 2, 3, 4, 5, 6 to 7 is shown in each case without the evaporator.As shown in FIGS. 2, 3, 4, 5, 6 to 7, it is an asymmetrically shaped air conditioning system 1.FIGS. 4, 5, 6 to 7 show particularly well the air flaps 6, 8 which can be adjusted independently of one another. As can also be seen from the drawing, the bypass air is removed here, in contrast to FIG. 1, on the same side of the air duct 16.In addition to the written disclosure above, reference is hereby made in addition to the illustration in FIGS. 1, 2, 3, 4, 5, 6 to 7 for further disclosure of the invention.

Claims

Air conditioning system (1) for a vehicle, having a blower (2) for aspirating air (12), an evaporator (3) for cooling at least part of the aspirated air (12), a mixing space (4) adjoining the evaporator downstream of the air flow, and a bypass device for guiding part of the aspirated air (12) past the evaporator (3) into the mixing space (4), characterized in that the bypass device comprises a first bypass duct (5) with a first air flap (6) and a second bypass duct (7) with a second air flap (8) and is configured to separately regulate a first air flow through the first bypass duct (5) and a second air flow through the second bypass duct (7) by means of the first air flap (6) and the second air flap (8), in each case, wherein the bypass device with outflow openings (10, The first bypass duct (5) and the second bypass duct (7) are configured such that the first air flow via the first bypass duct (5) on a first, left or right side relative to the evaporator (3) and the second air flow via the second bypass duct (7) on a second side opposite the first side are guided through the outflow openings (10, 11) into the mixing space (4), wherein behind the evaporator (3) the outflow openings (10, 11) are arranged on both sides over the entire height of the evaporator (3).Air conditioning system (1) for a vehicle, having a blower (2) for aspirating air (12), an evaporator (3) for cooling at least part of the aspirated air (12), a mixing space (4) adjoining the evaporator downstream of the air flow, and a bypass device for guiding part of the aspirated air (12) past the evaporator (3) into the mixing space (4), characterized in that the bypass device has a first bypass duct (5) and a second bypass duct (7) with a common air flap and is designed to regulate a first air flow through the first bypass duct (5) and a second air flow through the second bypass duct (7) by means of the air flap, wherein the bypass device is provided with outflow openings (10, 11) and the first bypass duct (5) and the second bypass duct (7) are designed in such a way that, the first air flow via the first bypass duct (5) on a first, left or right side relative to the evaporator (3) and the second air flow via the second bypass duct (7) on a second side opposite the first side are guided through the outflow openings (10, 11) into the mixing space (4), wherein behind the evaporator (3) the outflow openings (10, 11) are arranged on both sides over the entire height of the evaporator (3).The air conditioner (1) according to claim 1 or 2, characterized in that the air conditioner (1) further comprises at least one chimney-like outflow part (9) adjacent to the mixing space (4) and extending from top to bottom, comprising the outflow openings (10) placed on the second side relative to the evaporator (3).Air-conditioning system (1) according to Claim 1, 2 or 3, characterized in that the first side assigned to the first bypass duct (5) is close to the fan and the first bypass duct (5) is arranged in an installation space (15) which lies between the fan (2), in particular the fan (2) and / or an associated air filter (13) arranged behind the fan (2), and the evaporator (3).Air conditioning system (1) according to Claim 3 or 4, characterized in that the second bypass duct (7) is led past the evaporator (3) at the top or bottom and opens into the chimney-like outflow part (9).Air conditioning system (1) according to one of Claims 1 to 4, characterized in that the sizes of the outflow openings (10, 11) vary and become continuously smaller or larger in particular along a specific spatial direction along the bypass device.Air-conditioning system (1) according to Claim 1, characterized in that the first air flap (6) and the second air flap (8) are in particular mechanically coupled to one another.Air conditioning system (1) according to Claim 1, characterized in that the first air flap (6) and / or the second air flap (8) are each equipped with additional air guiding elements attached to the respective air flap (6, 8).Method for operating an air conditioning system (1) according to Claim 1, wherein the air conditioning system (1) has a fan (2) for aspirating air (12), an evaporator (3), a mixing space (4) arranged behind the evaporator (3), and a bypass device having a first bypass duct (5) and a second bypass duct (7) which are guided to different sides of the mixing space (4) and with which some of the air (12) is guided past the evaporator (3), characterized in that a first air flow through the first bypass duct (5) is regulated by means of a first air flap (6) of the first bypass duct (5) and a second air flow through the second bypass duct (7) is regulated in such a way by means of a second air flap (8) of the second bypass duct (7), that even in the presence of a respectively different pressure drop in the first bypass duct (5) and in the second bypass duct (7) an identical air mass flow is introduced into the mixing chamber (4) through both bypass ducts (5, 7), wherein the bypass device is provided with outflow openings (10, 11) and the first bypass duct (5) and the second bypass duct (7) are designed such that the first air flow is guided via the first bypass duct (5) on a first, left or right side relative to the evaporator (3) and the second air flow is guided via the second bypass duct (7) on a second side opposite the first side through the outflow openings (10, 11) into the mixing chamber (4).Method for operating an air conditioning system (1) according to Claim 2, wherein the air conditioning system (1) has a fan (2) for aspirating air (12), an evaporator (3), a mixing space (4) arranged behind the evaporator (3), and a bypass device having a first bypass duct (5) and a second bypass duct (7) which are guided to different sides of the mixing space (4) and with which some of the air (12) is guided past the evaporator (3), characterized in that a first air flow through the first bypass duct (5) is regulated by means of an air flap of the first bypass duct (5) and a second air flow through the second bypass duct (7) is regulated by means of the air flap in such a way that even in the presence of a respectively different pressure drop in the first bypass duct (5) and in the second bypass duct (7) is regulated by both bypass ducts (5, In some embodiments, the flow of air into the mixing chamber (4) is in each case identical, wherein the bypass device is provided with outflow openings (10, 11), and the first bypass channel (5) and the second bypass channel (7) are designed such that the first air flow is guided via the first bypass channel (5) on a first, left or right side relative to the evaporator (3) and the second air flow is guided via the second bypass channel (7) on a second side opposite the first side through the outflow openings (10, 11) into the mixing chamber (4).

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