Low sound emission diffuser and air conditioning system comprising the same

Abstract

The invention relates to a low sound emission diffuser (1) having a diffuser housing (2) which delimits or forms a mounting space (3), a flow path (4) for an air flow (5) of air extending through the mounting space from an inlet opening (7) to an outlet opening (8), the diffuser housing (2) delimiting or forming the inlet opening on its inflow side (6), the diffuser housing (2) delimiting or forming the outlet opening on its outflow side (8). The diffuser (1) has a multi-part, optionally three-part flow manipulator (11) for absorbing sound transmitted by air, which extends along the flow path (4) between the inlet opening (7) and the outlet opening (9). The invention also relates to an air conditioning system of a motor vehicle comprising at least one such low sound emission diffuser (1).

Description

Technical Field

[0001] The present invention relates to a low-noise diffuser according to claim 1 and an air conditioning system including at least one such diffuser. Background Technology

[0002] Known vehicle air conditioning systems with diffusers are relatively noisy during operation. Although quieter vehicle air conditioning systems are still desired due to the quieter operation of vehicles associated with the switch to electric drive. Summary of the Invention

[0003] The object of this invention is to provide or propose an improved or at least different diffuser.

[0004] In this invention, this objective is achieved, in particular, by means of the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims and the description.

[0005] The basic idea of ​​this invention is to absorb the sound transmitted through the air in the diffuser by using a flow-effective component disposed within the diffuser.

[0006] To this end, the present invention provides a low-noise emission diffuser, particularly a diffuser for an air conditioning system of a motor vehicle, the diffuser having a diffuser housing that defines or forms an installation space. An airflow path for air extends through the installation space, i.e., from an air inlet opening to an air outlet opening, the diffuser housing defining or forming the inlet opening on its inlet side and the outlet opening on its outflow side. The diffuser also has a multi-piece, optionally three-piece, flow manipulator for absorbing airborne sound, the flow manipulator extending along the flow path between the inlet and outlet openings. The multi-piece flow manipulator of the diffuser can be inexpensively manufactured and causes absorption of airborne sound within the diffuser housing and a reduction in pressure loss within the diffuser housing, resulting in relatively low noise emissions from the diffuser according to the invention. In practice, the low-noise emission diffuser according to the invention can be integrated into the air conditioning system of a motor vehicle. There, the low-noise diffuser according to the invention can absorb airborne sound and reduce pressure loss, the airborne sound being emitted, for example, by an air conditioning system fan located upstream of the diffuser and carried by the airflow into the low-noise diffuser according to the invention. This has the technical advantage that the air conditioning system equipped with the low-noise diffuser according to the invention operates in a relatively low-noise and energy-efficient manner. Therefore, during vehicle operation, passengers of the vehicle can perceive the corresponding air conditioning system less or almost nothing, thereby improving ride comfort.

[0007] Advantageously, the flow manipulator comprises: a separate air inlet through which air can flow, for guiding the airflow entering through the inlet opening, particularly from an air conditioning system fan located upstream of the low-noise emission diffuser; at least one separate guide vane through which air can flow, for guiding the airflow; and a separate pressure orifice device through which air can flow, for generating a pressure gradient within the airflow. The air inlet, at least one guide vane, and pressure orifice device fluidly cooperate to achieve absorption of sound propagating through the air within the diffuser housing and simultaneously reduce pressure loss within the diffuser housing. Therefore, during operation of the air conditioning system equipped with the low-noise emission diffuser, the diffuser advantageously emits no or at least almost no interfering noise.

[0008] Furthermore, it is advantageously arranged that at least one guide vane passes through the pressure orifice device in contact with it. Additionally, at least one guide vane and the air inlet can be laterally spaced apart from each other relative to the flow path. The at least one guide vane and the air inlet are thus advantageously arranged in a non-contact manner, i.e., implemented separately and positioned at a distance from each other. Furthermore, the pressure orifice device and the air inlet can be longitudinally spaced apart from each other relative to the flow path. The pressure orifice device and the air inlet are thus advantageously arranged in a non-contact manner, i.e., implemented separately and positioned at a distance from each other. Therefore, an advantageous arrangement of the components of the flow manipulator is proposed.

[0009] Advantageously, the air inlet, at least one guide vane, and pressure orifice are respectively arranged in contact with each other on the diffuser housing. In this context, it is advantageous that the air inlet is disposed and fixed, optionally releasably inserted into the inflow side, and freely extends into the mounting space. Alternatively or additionally, at least one guide vane can be disposed and fixed, optionally releasably inserted into both the inflow and outflow sides, wherein the guide vane extends completely through the mounting space along the flow path. Furthermore, the diffuser housing can have longitudinal sides connecting the inflow and outflow sides to each other, wherein the pressure orifice is disposed and fixed, optionally releasably inserted into at least one, preferably all, longitudinal sides. Thus, another advantageous arrangement of the components of the flow manipulator is proposed, by virtue of which advantageous absorption of airborne sound is achieved.

[0010] Advantageously, the airflow inlet extends into the mounting space by one-third (33%) of the distance traveled from the inlet opening to the outlet opening, parallel to the flow path. It goes without saying that, without departing from the scope of the invention, the airflow inlet can also extend into the mounting space with a tolerance range around this technical parameter (e.g., a tolerance range around 1 / 3 (33%) ± 20%). Therefore, a preferred component length for the airflow inlet is proposed, by which advantageous guidance of the airflow into the diffuser housing can be achieved.

[0011] Another advantage is that the air inlet has an inlet for air inflow and an outlet for air outflow. This advantageously allows the flow path to begin at the inlet and extend through the air inlet to the outlet, enabling air to flow through it. Furthermore, the air inlet can be positioned on the inflow side with its inlet opening facing the inlet opening. Therefore, airflow passing through the inlet opening of the diffuser housing can flow into the air inlet. Alternatively or additionally, the air inlet can extend freely into the mounting space from the inflow side, particularly the inlet opening, along the flow path towards the outlet opening by forming a cantilever section through which air can flow and around the cantilever section.

[0012] The free end of the cantilever section can thus form or have an outlet. The outlet preferably defines an outlet nozzle facing a pressure orifice device on the opposite side. Advantageously, the angle between the outlet nozzle and the pressure orifice device is greater than or equal to 0° and less than or equal to 90°, preferably less than or equal to 45°. Therefore, a preferred structural embodiment for an airflow inlet is proposed.

[0013] Another advantage is that the air inlet is formed through a polygonal tube, particularly a monolithic tube with a polygonal tube base, through which air can flow, or through a rectangular tube, particularly a monolithic tube base, through which air can flow. Therefore, a cost-effective embodiment for the air inlet is proposed.

[0014] Another advantage is that the diffuser housing is implemented in a multi-piece configuration and has at least one first housing portion referred to as the upper housing and a second housing portion referred to as the lower housing, wherein the air inlet is fixed to the upper housing and / or the lower housing, and optionally releasably inserted into the upper housing and / or the lower housing. Therefore, a preferred mounting location on the diffuser housing is proposed for the air inlet.

[0015] Another advantage is that at least one guide vane is implemented in a curved manner. Therefore, advantageously, at least one guide vane guides or deflects the airflow in a curved manner, such that the flow path for the airflow is quasi-curved. This has a particularly significant technical advantage: even when the inlet and outlet openings are set at an angle to each other, air can still be guided from the inlet opening of the diffuser housing to the outlet opening.

[0016] Furthermore, it is advantageous that at least one guide vane is disposed in the region of the inlet opening on the inflow side, and extends completely through the installation space along the flow path from the inflow side, particularly the inlet opening. The at least one guide vane can thus be guided such that it passes through the pressure orifice device by forming a penetration point, wherein in the region of the penetration point, or in the region between the pressure orifice device and the at least one guide vane, an angle of 45° to 90°, particularly a right angle, is crossed. Moreover, at least one guide vane is advantageously disposed in the region of the outlet opening on the outflow side. Therefore, a preferred component length for the airflow inlet is proposed, by which advantageous air guidance of the airflow through the diffuser housing is achieved.

[0017] In order to provide a preferred mounting position for at least one guide vane on the diffuser housing, it is advantageous to configure the diffuser housing as a multi-piece assembly having a first housing portion referred to as the upper housing and a second housing portion referred to as the lower housing, wherein at least one guide vane is fixed to the upper housing and / or the lower housing, and optionally releasably inserted into the upper housing and / or the lower housing.

[0018] Another advantage is that at least one guide vane is formed from a flat rod, particularly a single piece. Here, the flat rod can preferably have a rectangular base surface. Therefore, a cost-effective embodiment of the guide vane is proposed.

[0019] Advantageously, the pressure orifice device extends transversely to the flow path, particularly completely through the diffuser housing, and has at least one orifice opening through which air can flow. Within the diffuser housing, the pressure orifice device functions as an air separator or partition wall, with the flow path extending through at least one orifice opening. Therefore, the at least one orifice opening creates a passage for air, through which the airflow characteristics, particularly the airflow upstream and downstream of the orifice opening, such as airflow velocity, air mass flow, air volume flow, and air pressure, can be set according to the placement of the corresponding orifice opening on the pressure orifice device and the structural opening size of the corresponding orifice opening. Furthermore, the at least one orifice opening is preferably centrally located in the center of the pressure orifice device or in a region of the center of the pressure orifice device, i.e., located in or in a region of the geometric center of the pressure orifice device. Therefore, a favorable pressure gradient within the airflow can be achieved.

[0020] Furthermore, the pressure orifice device divides the installation space of the diffuser housing into two fluid-separated installation space halves, which are connected to each other to allow fluid communication via at least one orifice opening. Air can thus flow along a flow path from one installation space half through the orifice opening of the pressure orifice device into the other installation space half. Alternatively or additionally, the first large surface of the pressure orifice device can face the inlet opening and / or the outlet of the air inlet on the opposite side, wherein the second large surface of the pressure orifice device, oriented in the opposite direction relative to the first large surface, faces the outlet opening on the opposite side. Furthermore, alternatively or additionally, an angle greater than 0° to 45° can be spanned between the first large surface and the inlet opening. Furthermore, an angle greater than 0° to 45° can be spanned between the first large surface and the outlet. Furthermore, an angle greater than 0° to 25° can be spanned between the second large surface and the outlet opening. Therefore, preferred structural embodiments and arrangements for the pressure orifice device are proposed.

[0021] Another advantage is that the pressure orifice device has an integral or separate annular flange that completely frames the orifice opening around its perimeter. The annular flange advantageously forms a quasi-raised opening edge that extends completely around the orifice opening. Therefore, a favorable pressure gradient can be established, particularly within the diffuser housing, making it possible to avoid pressure loss.

[0022] Another advantage is that the pressure orifice device is located in a position within the diffuser housing that begins at 2 / 3 (66%) of the travel distance from the inlet opening to the outlet opening, traveling parallel to the flow path. It goes without saying that, without departing from the scope of the invention, the pressure orifice device can also be positioned within the diffuser housing with a tolerance range around this location (e.g., around 2 / 3 (66%) + / - 20%). Therefore, a preferred location for the pressure orifice device is proposed, by virtue of which a favorable pressure gradient can be achieved.

[0023] Advantageously, the pressure orifice device has at least one drain opening for allowing water accumulated in the diffuser housing to drain out. At a minimum, it is conceivable that the accumulated water flows from one mounting space half of the diffuser housing into the other mounting space half and / or flows out into a drain channel fluidly connected to the diffuser housing. Therefore, condensate, for example, accumulated during diffuser operation, can be drained from the diffuser housing without additional auxiliary measures.

[0024] It is also advantageous to configure the size and position of at least one guide vane and / or the size and position of the orifice opening of the pressure orifice device and / or the shape of the air inlet to be structurally determined by flow simulation in order to reduce pressure loss.

[0025] Advantageously, the diffuser housing is implemented in a multi-piece configuration and has a first housing portion referred to as the upper housing and a second housing portion referred to as the lower housing, wherein the pressure port device is fixed to the upper housing and / or the lower housing, and optionally releasably inserted into the upper housing and / or the lower housing. Therefore, a preferred mounting location for the pressure port device on the diffuser housing is also proposed.

[0026] Advantageously, the pressure hole device is formed from a particularly integral flat plate. For example, the flat plate can have a rectangular base surface and can be implemented with a thickness of a few millimeters, advantageously from 1 millimeter to 10 millimeters. Thus, a particularly inexpensive embodiment of the pressure hole device is proposed.

[0027] The present invention can include alternative or additional basic ideas: proposing an air conditioning system for a motor vehicle that includes at least one low-noise emission diffuser according to the foregoing description.

[0028] Another advantage is that the inlet opening of the diffuser housing defines a rectangular inlet surface, which is smaller in area than the rectangular outlet surface defined by the outlet opening of the diffuser housing. Therefore, the low-noise emission diffuser achieves both a slowing of the airflow and an increase in air pressure along the flow path.

[0029] It can also be configured such that the inlet opening and outlet opening of the diffuser housing are set at an angle to each other, preferably at an angle of 25° to 135°.

[0030] In summary, the invention advantageously relates to a low-noise emission diffuser having a diffuser housing that defines or forms an installation space through which an airflow path for air originates from an inlet opening and extends to an outlet opening. The diffuser housing defines or forms the inlet opening on its inflow side and the outlet opening on its outflow side. The diffuser has a multi-piece, optionally three-piece, flow manipulator for absorbing airborne sound, the flow manipulator extending along the flow path between the inlet and outlet openings. Advantageously, the invention also relates to an air conditioning system for a motor vehicle that includes at least one such low-noise emission diffuser.

[0031] Other important features and advantages of the invention are apparent from the dependent claims, the drawings, and the description of related drawings based on the drawings.

[0032] It goes without saying that, without departing from the scope of the invention, the above features and the features to be explained below can be used not only in the combinations presented separately, but also in other combinations or individually. Attached Figure Description

[0033] Preferred exemplary embodiments of the present invention are shown in the accompanying drawings and described in more detail in the following description, wherein the same reference numerals denote the same or similar or functionally identical parts.

[0034] They are shown schematically respectively.

[0035] Figure 1 A perspective view of a low-noise diffuser according to a preferred embodiment of the invention is shown, wherein the housing portion, referred to as the upper housing, of the diffuser housing of the low-noise diffuser according to the invention is removed and indicated only by dashed lines to better identify the components of the low-noise diffuser according to the invention.

[0036] Figure 2 According to Figure 1 The top view of arrow II shown indicates Figure 1 The diffuser with low noise emission according to the present invention. Detailed Implementation

[0037] Figure 1 and Figure 2 A preferred exemplary embodiment of a low-noise emission diffuser is shown, which is generally identified by reference numeral 1 in the figure. This diffuser is integrated, for example, downstream of an air conditioning system fan (not shown) in an air conditioning system of a motor vehicle.

[0038] according to Figure 1 and Figure 2 The low-noise diffuser 1 has a two-piece diffuser housing 2, one upper housing portion referred to as upper housing 23, and the other lower housing portion referred to as lower housing 24. The upper housing 23 and lower housing 24 are preferably releasably secured to each other, for example by means of a releasable fastening device (not shown). However, in the present case, as mentioned, for better identification of the components of the low-noise diffuser 1 according to the invention, the upper housing 23 is removed and indicated only by dashed lines. The diffuser housing 2 defines or forms a mounting space 3, which is sealed relative to the surrounding area in an exemplary manner. A seal (not shown) can be inserted, for example, between the upper housing 23 and the lower housing 24 to prevent undesirable leakage on the diffuser housing 2. On the inlet side 6 of the air conditioning system fan facing the air conditioning system, the diffuser housing 2 defines or forms an inlet opening 7 leading into the mounting space 3 through which air can flow into the mounting space 3. Furthermore, the diffuser housing 2 defines or forms an outlet opening 9 on its outflow side 8, through which air can flow out of the installation space 3. The inlet opening 7 and the outlet opening 9 of the diffuser housing 2 are arranged at an angle to each other, for example, at a 45° angle.

[0039] exist Figure 1and Figure 2 The airflow path 4, indicated by the dashed line, extends through the installation space 3. Thus, the flow path 4 begins at or near the inlet opening 7, extends in a curved shape through the diffuser housing 2, and ends at or near the outlet opening 9. Therefore, the airflow 5 can flow through the diffuser housing 2. It can also be seen that the low-noise diffuser 1 has a three-piece flow manipulator 11 that extends along the flow path 4 between the inlet opening 7 and the outlet opening 9 to absorb sound propagating in the air. The three-piece flow manipulator 11 of the diffuser 1 causes absorption of sound propagating in the air within the diffuser housing 2 and reduces pressure loss within the diffuser housing 2, resulting in relatively low sound emissions from the low-noise diffuser 1. Airborne sound can be absorbed by means of flow manipulator 11. This airborne sound is emitted by the air conditioning fan of the air conditioning system and carried by the airflow 5 into the low-noise diffuser 1. The advantage of this is that the air conditioning system equipped with the low-noise diffuser 1 can operate in a relatively low noise and energy-efficient manner.

[0040] The flow manipulator 11, by way of example, has: a separate airflow inlet 12 through which air can flow, for guiding an airflow 5 of air flowing in through an inlet opening 7; a separate guide vane 13 through which air can flow, for guiding the airflow 5; and a separate pressure orifice device 14 through which air can flow, for generating a pressure gradient within the airflow 5.

[0041] In the current configuration, the air inlet 12 is fixed to the upper shell 23 and / or the lower shell 24, making it immovable relative to the diffuser housing 2. This air inlet is formed, by way of example, by an integral rectangular tube 21 with a rectangular tube base through which air can flow. The air inlet 12 has an inlet 16 at one end for air inflow and an outlet 17 at the opposite end for air outflow, allowing the air inlet 12 to be flushed by the airflow 5. Furthermore, the air inlet 12 is positioned on the inflow side 6 of the diffuser housing 2 with its inlet 16, wherein the inlet nozzle 18 defined by the inlet 16 faces the inlet opening 7. Therefore, the airflow 5 flowing through the inlet opening 18 of the diffuser housing 2 can flow into the air inlet 12. Especially in Figure 2As can be seen, the air inlet 12 originates from the inflow side 6 and extends freely into or cantilevered into the mounting space 3 along the flow path 4 toward the outlet opening 9 via a cantilever section 19. Air can flow through and around this cantilever section. The free end 37 formed by the cantilever section 19 forms or indicates the outlet 17, which defines the outlet nozzle 20. The outlet nozzle 20 faces the pressure orifice device 14 on the opposite side, wherein, by way of example, there is an angle of approximately 15° between the outlet nozzle 20 and the pressure orifice device 14. Furthermore, in Figure 2 The diagram shows a path referred to as travel path 15, which extends parallel to the flow path 4 from the inlet opening 7 to the outlet opening 9. In the current configuration: the airflow inlet begins at the inlet opening 7 and extends one-third of this travel path 15 into the mounting space 3.

[0042] The guide vane 13 is implemented in a slightly curved manner and extends fully through the mounting space 3 along the flow path 4 from the inlet side 6. The guide vane is, by way of example, formed from an integral flat rod with a rectangular flat rod base. Thus, by way of example, the guide vane 13 is fixed to the diffuser housing 2 in the region of the upper housing 23, on the one hand in the region of the inlet opening 7 on the inlet side 6 and on the other hand in the region of the outlet opening 9 on the outlet side 8. Furthermore, the guide vane 13 is guided through the diffuser housing 2 such that it passes through the pressure orifice device 14 by forming a penetration point 25. In the region or area of ​​the penetration point 25, there is, by way of example, an angle of 90° between the pressure orifice device 14 and at least one guide vane 13. Thus, the guide vane 13 is able to guide the airflow 5 of air from the inlet opening 7 to the outlet opening 9 through the diffuser housing 2 in a slightly curved manner.

[0043] The pressure orifice device 14 extends transversely to the flow path 4 or transversely to the airflow 5, completely passing through the diffuser housing 2. In this case, the pressure orifice device is formed of an integral flat plate 36 with an approximately rectangular base surface. The pressure orifice device rests with its edges against the upper housing 23 and lower housing 24, such that the pressure orifice device 14 divides the diffuser housing 2 or the mounting space 3 of the diffuser housing 2 into two fluid-separated mounting space halves 29 and 30. In this case, the pressure orifice device 14 has a passage for air, referred to as an orifice opening 27. According to the present exemplary embodiment, the orifice opening is located at the center of the pressure orifice device or in a region of the center of the pressure orifice device, i.e., at the geometric center of the pressure orifice device 14, and is completely enclosed by an annular flange 33 integrally implemented with the pressure orifice device 14. Thus, in the diffuser housing 2, the pressure orifice device 14 acts as an air separation device or partition wall, wherein the flow path 4 extends through at least one orifice opening 27, allowing air to flow along the flow path 4 from one mounting space half 28 through the orifice opening 27 of the pressure orifice device 14 into another mounting space half 30, so that the mounting space half 29, 30 can be in fluid communication with each other through at least one orifice opening 27.

[0044] exist Figure 2 It can also be seen that the pressure orifice device 14 has two large surfaces 31, 32 oriented in opposite directions, wherein the first large surface 31 of the pressure orifice device 14 faces the inlet opening 7 and the outlet 20 of the airflow inlet 12 on the opposite side. By way of example, there is an angle of 10° between the first large surface 31 and the inlet opening 7, and an angle of 15° between the first large surface 31 and the outlet 20. The other second large surface 32 of the pressure orifice device 14 faces the outlet opening 9 on the opposite side, wherein, by way of example, there is an angle of 10° between the second large surface 32 and the outlet opening 9. The pressure orifice device 14 is disposed by way of example in a position 34 in the diffuser housing 2, which begins when the inlet opening 7 is located at 2 / 3 of the travel distance 15.

[0045] Finally, it is important to note that the pressure orifice device 14, in addition to the orifice opening 27, also has a drain opening 35 for allowing water accumulated in the diffuser housing 2 to drain out. Advantageously, the accumulated water flows from one mounting space half 29, 30 of the diffuser housing 2 into the other mounting space half and / or the accumulated water flows out into a drain channel fluidly connected to the diffuser housing 2.

[0046] Due to the described shape, the air inlet 12, guide vane 13, and pressure orifice device 14 of the flow manipulator 11 can cooperate fluidly to achieve absorption of sound propagating in the air within the diffuser housing 2, and at the same time, to achieve a reduction in pressure loss within the diffuser housing 2.

Claims

1. A low sound emission diffuser (1), - having a diffuser housing (2) which delimits or forms a mounting space (3) through which a flow path (4) for an air flow (5) of air extends from an inlet opening (7) to an outlet opening (9), the diffuser housing (2) delimiting or forming the inlet opening on its inflow side (6), the diffuser housing (2) delimiting or forming the outlet opening on its outflow side (8), - wherein the diffuser (1) has a multi-piece flow manipulator (11) for absorbing sound transmitted by air, which extends along the flow path (4) between the inlet opening (7) and the outlet opening (9), characterized in that - the flow manipulator (11) has a separate air flow inlet (12) through which air can flow for guiding the air flow (5) flowing in through the inlet opening (7), - a separate at least one guide vane (13) through which air can flow for guiding the air flow (5), wherein the separate at least one guide vane (13) extends completely through the mounting space (3) along the flow path (4), and - a separate pressure hole device (14) through which air can flow for generating a pressure gradient within the air flow (5), wherein the pressure hole device (14) is formed by an integral flat plate (36) and extends through the diffuser housing (2) transversely to the flow path (4).

2. The low sound emission diffuser (1) according to claim 1, wherein the low sound emission diffuser (1) is a diffuser (1) for an air conditioning system of a motor vehicle, and / or the flow manipulator (11) is three-piece.

3. The low sound emission diffuser (1) according to claim 1 or 2, characterized in that - the at least one guide vane (13) passes through the pressure hole device (14) in a contact manner, - the at least one guide vane (13) and the air flow inlet (12) are spaced apart from each other transversely with respect to the flow path (4), and - the pressure hole device (14) and the air flow inlet (12) are spaced apart from each other longitudinally with respect to the flow path (4).

4. The low sound emission diffuser (1) according to claim 1 or 2, characterized in that the air flow inlet (12), the at least one guide vane (13) and the pressure hole device (14) are each arranged on the diffuser housing (2) in a contact manner.

5. The low sound emission diffuser (1) according to claim 1 or 2, characterized in that - the air flow inlet (12) is arranged and fixed on the inflow side (6) and freely projects into the mounting space (3), and / or - the at least one guide vane (13) is arranged and fixed on the inflow side (6) and on the outflow side (8), and / or - the diffuser housing (2) has longitudinal sides (10) which connect the inflow side (6) and the outflow side (8) to one another, wherein the pressure hole device (14) is arranged and fixed on at least one longitudinal side (10).

6. Low-noise discharge diffuser (1) according to claim 1 or 2, characterized in that the air flow inlet (12) extends into the installation space (3) over 1 / 3 of the travel distance (15) of the inlet opening (7) running parallel to the flow path (4) from the inlet opening (7) to the outlet opening (9).

7. Low-noise discharge diffuser (1) according to claim 1 or 2, characterized in that - the air flow inlet (12) has an inlet (16) for the inflow of air and an outlet (17) for the outflow of air, and / or - the air flow inlet (12) is arranged with its inlet (16) on the inflow side (6) such that an inlet mouth (18) delimited by the inlet (16) is directed at the inlet opening (7), and / or - the air flow inlet (12) extends freely into the installation space (3) from the inflow side (6) in the direction of the flow path (4) towards the outlet opening (9) by forming a cantilever section (19) through which air can flow and around which air can flow, and / or - a free end (37) of the cantilever section (19) forms or has the outlet (17), wherein the outlet (17) delimits an outlet mouth (20) which faces the pressure hole device (14) on the opposite side, and / or - an angle of greater than or equal to 0° and less than or equal to 90° is spanned between the outlet mouth (20) and the pressure hole device (14).

8. Low-noise discharge diffuser (1) according to claim 1 or 2, characterized in that the air flow inlet (12) is formed by a polygonal tube or a rectangular tube (21) having a polygonal tube base surface through which air can flow, which has a rectangular tube base surface through which air can flow.

9. Low-noise discharge diffuser (1) according to claim 1 or 2, characterized in that the diffuser housing (2) is embodied in multiple parts and has at least a first housing part referred to as an upper housing (23) and a second housing part referred to as a lower housing (24), wherein the air flow inlet (12) is fixed to the upper housing (23) and / or the lower housing (24).

10. Low-noise discharge diffuser (1) according to claim 1 or 2, characterized in that - the at least one guide vane (13) is embodied in a curved manner, and / or - the at least one guide vane (13) is arranged in the region of an inlet opening (7) on the inflow side (6) and extends completely through the installation space (3) along the flow path (4) starting from the inflow side (6), wherein the at least one guide vane penetrates the pressure hole device (14) by forming a penetration point (25), wherein an angle of 45° to 90° is spanned between the pressure hole device (14) and the at least one guide vane (13) on or in the region of the penetration point (25), and wherein the at least one guide vane (13) is arranged in the region of an outlet opening (9) on the outflow side (8).

11. Low sound emission diffuser (1) according to claim 1 or 2, characterized in that - the diffuser housing (2) is embodied in multiple parts and has a first housing part, referred to as upper housing (23), and a second housing part, referred to as lower housing (24), - wherein the at least one guide vane (13) is fixed to the upper housing (23) and / or the lower housing (24), and / or - the at least one guide vane (13) is formed by a flat bar (26).

12. Low sound emission diffuser (1) according to claim 1 or 2, characterized in that - the pressure hole device (14) has at least one hole opening (27) through which air can flow, and / or - the at least one hole opening (27) is arranged in or in the region of a pressure hole device center of the pressure hole device (14), and / or - the pressure hole device (14) divides the installation space (3) of the diffuser housing (2) into two installation space halves (29, 30) that are fluidically separated from one another and that are connected to one another in order to be in fluid communication via the at least one hole opening (27), and / or - a first large surface (31) of the pressure hole device (14) faces the inlet opening (7) and / or the outlet (20) of the air flow inlet (12) on the opposite side, wherein a second large surface (32) of the pressure hole device (14), which is oriented in the opposite direction relative to the first large surface (31), faces the outlet opening (9) on the opposite side, and / or - wherein an angle of more than 0° and less than 45° is spanned between the first large surface (31) and the inlet opening (7), and / or - wherein an angle of more than 0° and less than 45° is spanned between the first large surface (31) and the outlet (20), and / or - wherein an angle of more than 0° and less than 25° is spanned between the second large surface (32) and the outlet opening (9), and / or - wherein the pressure hole device (14) has an overall or separate annular flange (33) that completely frames the hole opening (27) all around, - the pressure hole device (14) has at least one drainage opening (35) for flowing water that has accumulated in the diffuser housing (2) out.

13. Low sound emission diffuser (1) according to claim 1 or 2, characterized in that the pressure hole device (14) is arranged in a position (34) in the diffuser housing (2) which begins with the inlet opening (7) at 2 / 3 of the travel path (15) which extends from the inlet opening (7) to the outlet opening (9) running parallel to the flow path (4).

14. Low sound emission diffuser (1) according to claim 1 or 2, characterized in that - the diffuser housing (2) is embodied in multiple parts and has a first housing part which is referred to as upper housing (23) and a second housing part which is referred to as lower housing (24), - wherein the pressure hole device (14) is fixed to the upper housing (23) and / or the lower housing (24).

15. Low sound emission diffuser (1) according to claim 5, wherein the air flow inlet (12) is releasably inserted on the inflow side (6) and / or the at least one guide vane (13) is releasably inserted on the inflow side (6) and the outflow side (8) and / or the pressure hole device (14) is releasably inserted on at least one longitudinal side (10).

16. Low sound emission diffuser (1) according to claim 5, wherein the pressure hole device (14) is arranged and fixed on all longitudinal sides (10).

17. Low sound emission diffuser (1) according to claim 7, wherein the air flow inlet (12) begins with the inlet opening (7) to project into the installation space (3) and / or the angle is greater than or equal to 0° and less than or equal to 45°.

18. Low sound emission diffuser (1) according to claim 8, wherein the polygonal tube and / or the rectangular tube is one-piece.

19. Low sound emission diffuser (1) according to claim 9, wherein the air flow inlet (12) is releasably inserted into the upper housing (23) and / or the lower housing (24).

20. Low sound emission diffuser (1) according to claim 10, wherein the at least one guide vane (13) begins with the inlet opening (7) to extend completely through the installation space (3) and / or the angle is a right angle.

21. Low sound emission diffuser (1) according to claim 11, wherein the at least one guide vane (13) is releasably inserted into the upper housing (23) and / or the lower housing (24) and / or the flat bar is one-piece.

22. Low sound emission diffuser (1) according to claim 14, wherein the pressure hole device (14) is releasably inserted into the upper housing (23) and / or the lower housing (24).

23. Air conditioning system of a motor vehicle comprising at least one low sound emission diffuser (1) according to one of claims 1 to 22.

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