automotive air conditioning

Abstract

Automotive air conditioning system, comprehensive - a case, - a blower (1) with a blower inlet opening (3) for drawing in air and a blower outlet opening (4) for blowing the air out of the blower (1), - an element (6) for conditioning the air passed through the motor vehicle air conditioning system, characterized in that - a diffuser channel (5), bounded by a diffuser channel housing (11), is provided for directing the air from a blower outlet opening (4) to the element (6), so that all the introduced air flows through the element (6) and an airflow around the element (6) is not possible because the diffuser channel housing (11) rests airtight on the element (6), wherein the diffuser channel (5), in particular at a diffuser inlet (12), has a larger extent in at least one direction of directional lines (9) parallel to a fictitious plane (10) spanned by the element (6) than the element (6), in particular an inlet side (7) of the element (6), in the same direction.

Description

[0001] The present invention relates to a motor vehicle air conditioning system according to the preamble of claim 1.

[0002] Automotive air conditioning systems are used to cool and / or heat the air supplied to the vehicle's interior. For this purpose, air is drawn in by a blower from the vehicle's surroundings or from within the vehicle's interior. It is then directed through a diffuser duct to an air filter and subsequently to a refrigerant evaporator, or directly to a refrigerant evaporator. After passing through the air filter or the refrigerant evaporator, the air can be heated in a heating element located downstream of the refrigerant evaporator in the direction of airflow. In many cases of unfavorable installation space within the vehicle, an asymmetrical airflow pattern through a diffuser duct from the blower to the refrigerant evaporator is necessary.In an asymmetrical airflow system, the outflow direction of the air exiting the blower outlet and the direction perpendicular to an imaginary plane defined by the refrigerant evaporator are at an acute angle to each other. This results in a curvature of the diffuser duct from the blower outlet to the diffuser inlet. Consequently, the airflow at the diffuser inlet is unfavorable, leading to uneven flow through the refrigerant evaporator. This results in uneven and inefficient cooling of the air passing through the refrigerant evaporator and, furthermore, an increased pressure drop on the air side within the evaporator.

[0003] DE 37 06 219 C1 discloses a ventilation device with a blower for generating an airflow and with an air filter arranged downstream in the airflow, which can be pivoted out of the airflow to increase the flow velocity and air throughput.

[0004] JP 2003 - 170 725 A discloses an air conditioning system with a housing in which an evaporator is arranged, wherein an air duct is arranged above the evaporator to allow air to flow around the evaporator.

[0005] DE 197 22 866 A1 discloses a heating or air conditioning system with a housing and with a blower with blower housing, wherein an air duct with at least one bend is arranged between the housing of the air conditioning system and the blower housing.

[0006] The object of the present invention is therefore to provide a motor vehicle air conditioning system in which an element, preferably the air filter or the refrigerant evaporator, is predominantly uniformly permeated by air with a low pressure drop.

[0007] This problem is solved with a motor vehicle air conditioning system according to claim 1.

[0008] Such a motor vehicle air conditioning system comprises a housing, a blower with a blower inlet opening for drawing in air and a blower outlet opening for expelling air from the blower, a conditioning element, such as in particular a refrigerant evaporator for cooling or an air filter for filtering the air passed through the motor vehicle air conditioning system, and a diffuser channel for directing the air from a blower outlet opening to the element. The diffuser channel, particularly at its inlet, has a greater extent in at least one direction of lines parallel to a plane spanned by the element than the element itself, particularly an inlet side of the element, in the same direction. Thus, the diffuser channel has a greater extent, particularly at its inlet in the region of the element, than the element in the same direction.This reduces the flow velocity of the air flowing through the diffuser channel, particularly at the diffuser inlet, resulting in better and more uniform airflow through the element. Additionally, this significantly reduces the pressure drop within the element.

[0009] The inlet side is appropriately an opening area of ​​the element and / or the air filter for introducing air through the element, such as the refrigerant evaporator and / or the air filter.

[0010] In particular, the diffuser channel has a larger extent, especially exclusively, in the area of ​​the inflow side of the element.

[0011] In a further embodiment, the diffuser channel, particularly exclusively, has a larger dimension at a distance of less than 20 cm, 10 cm, 5 cm, or 2 cm from the inlet side of the element. The diffuser channel, especially the diffuser inlet, thus has a larger dimension than the element itself in the region of the inlet side of the element, or at a distance of less than 20 cm from the inlet side. This reduces the airflow velocity, particularly in the inlet area at the inlet side of the diffuser channel, and thereby allows for a particularly uniform flow through the element.

[0012] In a supplementary embodiment, the diffuser channel has a larger extent in at least one direction of, and in particular exclusively, parallel lines of direction parallel to a fictitious plane spanned by the element than the element itself in at least one direction of the same lines of direction. The lines of direction are thus aligned parallel to, and in at least one direction of, these parallel lines of direction, the larger extent of the diffuser channel, in particular the diffuser inlet, appears as part of the diffuser channel.

[0013] Preferably, the directional lines, in particular only parallel directional lines, are essentially vertically aligned parallel to the fictitious plane spanned by the element.

[0014] In one variant, the directional lines, in particular only parallel directional lines, are aligned parallel to the fictitious plane spanned by the element with a deviation of less than 30°, 20°, or 10° from a vertical plane. If the parallel directional lines, in particular exclusively parallel directional lines, are essentially vertically oriented, then the diffuser channel, in particular the diffuser inlet, is formed with a larger extent on a top and / or a bottom surface than the element, in particular the inlet side.

[0015] Advantageously, the diffuser channel has a greater extent in a first direction and / or in a second direction of the directional lines, with the second direction being opposite to the first. If the parallel directional lines are essentially vertically oriented and the first direction is, for example, directed upwards and the second direction downwards, then the first direction concerns the extent of the diffuser channel at the top and the second direction the extent of the diffuser channel at the bottom.

[0016] In a further embodiment, the extent of the diffuser channel is greater in at least one direction by at least 1%, 3%, 5%, 7%, 10%, or 20% than the extent of the element, and / or an air filter is arranged on the element, such that the air flows first through the air filter and then through the evaporator, and the air filter is considered the element with respect to its extent relative to the diffuser channel. An air filter can be provided as the element, such that the air flows from the diffuser inlet first through the air filter and then through the evaporator. With such an arrangement of the air filter as the element, the extent of the air filter is considered an extent of the element; in particular, the inlet side of the air filter corresponds to the inlet side of the element.

[0017] In particular, the outflow direction of the air flowing from the blower outlet opening and a direction perpendicular to an imaginary plane spanned by the element are aligned at an acute angle to each other, e.g., between 10° and 80°, preferably between 20° and 70°. If the outflow direction of the air flowing from the blower outlet opening and a direction perpendicular to the imaginary plane spanned by the element are perpendicular to each other, the diffuser channel between the blower outlet opening and the diffuser inlet is designed without any curvature or curve. With an asymmetrical airflow from the blower outlet opening to the element, only the airflow from the blower outlet opening to the diffuser inlet is considered, and here, at an acute angle, a curve occurs in the airflow from the blower outlet opening to the diffuser inlet. The deflection of the air at the diffuser inlet is therefore not taken into account.Preferably, the air is deflected by 90° at the diffuser inlet, meaning that the diffuser inlet and the imaginary plane spanned by the element are essentially perpendicular to each other. Essentially perpendicular to each other means that they are aligned with a deviation of less than 30°, 20°, or 10°.

[0018] In a further embodiment, the vehicle air conditioning system includes a heating device for heating the air passed through the vehicle air conditioning system and / or the blower is a radial blower in which a fan wheel can be radially permeated by the air and / or the vehicle air conditioning system includes at least one air duct in addition to the diffuser duct for passing air through it and in particular the at least one air duct is bounded by the housing.

[0019] An embodiment of the invention is described in more detail below with reference to the accompanying drawings. It shows: Fig. 1. A perspective view of a blower, a diffuser duct, and an element. Fig. 2 a horizontal section of the element and the diffuser duct and a view of the blower and Fig. 3 a vertical section of the diffuser inlet and diffuser channel and a view of the blower.

[0020] A vehicle air conditioning system (not shown) serves to supply cooled and / or heated air to the interior of a vehicle. For this purpose, the vehicle air conditioning system includes a blower 1 for drawing in air from a fresh air intake in the vehicle's surroundings and / or from a recirculation intake in the vehicle's interior. A corresponding air guide (not shown) can control and / or regulate whether the air is drawn in from the vehicle's surroundings and / or from the vehicle's interior. The air is drawn in through a blower inlet opening 3 and supplied by the blower 1 to a diffuser duct 5 through a blower outlet opening 4. The blower 1 comprises a blower housing 2 made of plastic, which is part of the vehicle air conditioning system's housing.Inside the blower housing 2, an impeller with conveying blades is arranged, and the impeller is driven by an electric motor (not shown). The air flows radially through the blades of the impeller, so that this is a radial blower (not shown).

[0021] The air exiting the blower outlet 4 flows through the diffuser channel 5 and then through a diffuser inlet 12, which is part of the diffuser channel 5. From the diffuser inlet 12, the air first flows through an air filter and then through an element 6. The air flows through an inlet side 7 of the element 6, which is formed by the element 6 itself. Both the diffuser channel 5 and the diffuser inlet 12 are bounded by a diffuser channel housing 11, which is part of the housing of the vehicle air conditioning system. The vehicle air conditioning system has an asymmetrical airflow from the blower 1 to the diffuser inlet 12; that is, a curve occurs in the airflow lines at the diffuser channel 5 outside the diffuser inlet 12. This can be Fig. 2 also along the line of the running length s za of the diffuser channel 5 outside the diffuser inlet 12 can be detected.

[0022] A fictitious plane 10 spanned by element 6, such as the refrigerant evaporator and / or the air filter, is essentially vertically oriented.

[0023] In the horizontal section in Fig. 2. The fictitious plane 10 is thus visible as a straight line. Parallel to the fictitious plane 10 are direction lines 9 ( Fig. 3) as fictitious straight lines 9 in Fig. 3 is shown. The direction lines 9 have a first upward direction and a second downward direction according to the arrows on the direction lines 9.

[0024] The diffuser channel 5 has a width b at the diffuser inlet 12. v and at the blower outlet opening 4 the width b z up. The width b v and the width b z This represents the horizontal extent of the diffuser channel 5. Furthermore, the diffuser channel 5 has a width b between the blower outlet opening 4 and the diffuser inlet 12. mThe blower outlet opening 4 has a height h z and element 6 as well as the air filter have a height h k on.

[0025] The diffuser inlet 12 has a height h in the area of ​​the inlet side 7, for example at a distance of less than 20 cm or 10 cm from the inlet side 7. v up. The height h is v greater than height h k of element 6 or refrigerant evaporator or air filter ( Fig. 3) The height h v The area of ​​the diffuser channel 5 is larger both on the upper side of the element 6 or evaporator or air filter, i.e. in the direction of a first direction of the directional line 9 upwards as well as in the direction of a second, downwards directed direction of the directional line according to Fig. 3, i.e., on the underside of element 6. The diffuser channel housing 11, which limits the diffuser inlet 12, is thus designed in a vertical section parallel to the fictitious plane 10 such that the height h v is greater than the height h k The diffuser channel housing 11 leads to the air filter only shortly before the inlet side 7 of the air filter. This ensures that all the air introduced into the air filter flows uniformly through the air filter and then through the element 6 at a relatively low flow velocity. Flow around the element 6 is not possible because the diffuser channel housing 11 forms an airtight seal on it. This advantageously creates a very uniform flow through the element 6, resulting in minimal pressure losses across it.

[0026] The diffuser channel 5 has a greater extent in the direction of the vertical direction line 9 not only at the diffuser inlet 12 but also between the diffuser inlet 12 and the blower outlet opening 4. To compensate for this, the diffuser channel 5 has a narrowing or indentation between the diffuser inlet 12 and the blower outlet opening 4, i.e., the width b m The distance between the diffuser inlet 12 and the blower outlet opening 4 is reduced. This allows for a better flow of air into the diffuser inlet 12.

[0027] A diffuser channel angle α ( Fig. 3) has an angle between 10° and 60°. The diffuser channel angle α indicates the increase in the vertical extent of the diffuser channel 5 between the blower outlet opening 4 and the diffuser inlet 12. An inflow angle β ( Fig.2) exhibits an angle between 0° and 55°. The inflow angle β is an angle between the fictitious plane 10 and a tangent to the diffuser channel housing 11 in a horizontal section just before the diffuser inlet 12. The inflow angle β allows the airflow from the diffuser channel 5 outside the diffuser inlet 12 into the diffuser inlet 12 to be optimized and modified.

[0028] Overall, the vehicle air conditioning system according to the invention offers significant advantages. The air is guided asymmetrically along a curve in the diffuser channel 5 from the blower outlet opening 4 to the diffuser inlet 12. In the area of ​​the inlet side 7, the diffuser inlet 12 has a larger vertical dimension than the element 6, thus achieving a substantially uniform flow through the air filter and the element 6 with significantly reduced pressure losses. Reference symbol list 1 blower 2 blower housings 3 Blower inlet opening 4 Blower outlet opening 5 diffuser channels 6 refrigerant evaporators 7 Inlet side of the refrigerant evaporator 9 Directional straight 10. Level spanned by the refrigerant evaporator 11 Diffuser channel housings 12 Diffuser inlet s za Diffuser channel length h v Height of diffuser channel on refrigerant evaporator h z Height of diffuser channel at blower outlet opening h k Refrigerant evaporator height h z Height of blower outlet opening b v Wide diffuser channel at diffuser inlet b z Wide diffuser channel at blower outlet opening b m Wide diffuser channel between diffuser inlet and blower outlet opening α Diffuser channel angle β Inflow angle

Claims

[1] Motor vehicle air conditioning system, comprising - a case, - a blower (1) with a blower inlet opening (3) for drawing in air and a blower outlet opening (4) for blowing the air out of the blower (1), - an element (6) for conditioning the air passed through the motor vehicle air conditioning system, characterized by , that - a diffuser channel (5), bounded by a diffuser channel housing (11), is provided for directing the air from a blower outlet opening (4) to the element (6), so that all the introduced air flows through the element (6) and an airflow around the element (6) is not possible because the diffuser channel housing (11) rests airtight on the element (6), wherein the diffuser channel (5), in particular at a diffuser inlet (12), has a larger extent in at least one direction of directional lines (9) parallel to a fictitious plane (10) spanned by the element (6) than the element (6), in particular an inlet side (7) of the element (6), in the same direction. [2] Motor vehicle air conditioning system according to claim 1, characterized by , that the diffuser channel (5), in particular exclusively, has the greater extent in the area of ​​the inflow side (7) of the element (6). [3] Motor vehicle air conditioning system according to claim 1 or 2, characterized by, that the diffuser channel (5), in particular exclusively, has the larger extent at a distance of less than 20 cm, 10 cm, 5 cm or 2 cm from the inlet side (7) of the element (6). [4] Motor vehicle air conditioning system according to any one of the preceding claims, characterized by , that the diffuser channel (5) has a larger extent in at least one direction of, in particular exclusively, parallel direction lines (9) parallel to a fictitious plane (10) spanned by the element (6) than the element (6) in at least one direction of the same direction line (9). [5] Motor vehicle air conditioning system according to any one of the preceding claims, characterized by , that the direction lines (9), in particular only parallel direction lines (9), are vertically aligned parallel to the fictitious plane (10) spanned by the element (6). [6] Motor vehicle air conditioning system according to any one of claims 1 to 4 , characterized by, that the direction lines (9), in particular only parallel direction lines (9), are aligned parallel to the fictitious plane (10) spanned by the element (6) with a deviation of less than 30°, 20° or 10° to a vertical plane. [7] Motor vehicle air conditioning system according to any one of the preceding claims, characterized by , that the diffuser channel (5) has the greater extent in a first direction and / or in a second direction of direction lines (9), the second direction being opposite to the first direction. [8] Motor vehicle air conditioning system according to any one of the preceding claims, characterized by , that the extent of the diffuser channel (5) in at least one direction is at least 1%, 3%, 5%, 7%, 10% or 20% greater than the extent of the element (6). [9] Motor vehicle air conditioning system according to any one of the preceding claims, characterized by, that the outflow direction of the air flowing out of the blower outlet opening (4) and a direction perpendicular to a fictitious plane (10) spanned by the element (6) are aligned at an acute angle to each other, e.g. between 10° and 80°, preferably between 20° and 70°. [10] Motor vehicle air conditioning system according to any one of the preceding claims, characterized by , that the motor vehicle air conditioning system includes a heating device for heating the air passed through the motor vehicle air conditioning system and / or the blower (1) is a radial blower in which a fan wheel is radially permeable to air and / or the motor vehicle air conditioning system includes at least one air duct in addition to the diffuser duct (5) for passing air through and in particular the at least one air duct is bounded by the housing. [11] Motor vehicle air conditioning system according to any one of the preceding claims, characterized by, that the element (6) is a refrigerant evaporator or a filter, such as in particular an air filter.

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