DE102019201504A1 - Air duct for a motor vehicle and method for its manufacture - Google Patents

Abstract

The invention describes an air duct for a motor vehicle. The air duct has an air inlet 14 and an endless profile, the endless profile and / or the air inlet having through openings. The endless profile has at least one protruding web 2, 2 ', 2 ". The endless profile 1, together with at least part of the outer wall 18 or with at least part of the inner wall 11 of the air inlet 14, forms a silencer 12 with at least one resonator chamber 8, 8', 8 "forms.

Description

The invention relates to an air duct for a motor vehicle, in particular as part of its heating, ventilation and / or air conditioning system, as part of the air or exhaust gas path of its internal combustion engine or, alternatively, the air path of its fuel cell drive.

The air flow in air ducts often leads to undesirable noise in motor vehicles, which must be dampened appropriately. That's how she looks DE 20 2013 105 639 A1 a sound-absorbing inner coating of the air duct. The DE 10 2016 118 583 A1 shows a ventilation device which has a Helmholtz resonator adjacent to the air outlet for sound insulation. The JP 2006 123659 A discloses an air duct for a motor vehicle with an air outlet, a housing for sound absorption being arranged downstream of the air outlet. The housing has an acoustic chamber with an air-permeable element that absorbs the sound.

In contrast, it is an object of an embodiment of the invention to provide an air duct with a modular silencer.

These and other tasks are solved by the features of the independent features. Advantageous further developments are represented by the dependent features.

According to one embodiment, an air duct for a motor vehicle is provided, for example a dimensionally stable metal or plastic duct. The air duct has an air inlet and an endless profile. For the purposes of this description, an air inlet is also an air outlet, since the direction of flow is not important for the technical solution explained below. The air inlet can have a rectangular or round cross section and in particular has a closed outer wall (possibly with the exception of certain through openings, which are explained below), for example cylindrical. The endless profile, which can consist of metal or plastic and / or the air inlet has through openings or holes. The endless profile has at least one protruding web. The endless profile, together with at least part of the outer wall or with at least part of the inner wall of the air inlet, forms a silencer with at least one resonator chamber.

In practical use, air flows, e.g. Fresh air or exhaust gases, through the air duct and reaches the area of the endless profile. Part of the air and thus the sound waves reach the resonator chambers through the through openings and dampen the sound in the corresponding frequency range, which is largely determined by the geometry of the resonator chambers and the through openings (e.g. round, rectangular or diamond-shaped), whereby the openings can be created by punching. In this case, the inner or outer wall of the air inlet or at least part of it forms a first part of the muffler and the endless profile forms a corresponding second part of the muffler, which saves material for the provision of the muffler.

The endless profile can be positioned outside or inside the air inlet. In the former case, the projecting end of the web lies on the outer wall of the air inlet and the air inlet has the through openings through which air can flow into the resonator chamber thus formed. In the other case, the projecting end of the web rests on the inner wall of the air inlet and the through openings are provided in the endless profile. Both variants can also be combined with one another.

This is a structurally simple and modular solution because a standardized endless profile is used that is cut to length, in particular with a length that is an integral multiple of a minimum length.

In one embodiment, the projecting end of the web rests on the outer or inner wall of the air inlet. The web thus defines the geometry of the resonator chambers and thus the resonance property. In this respect, the dimension by which the web protrudes from the endless profile (hereinafter referred to as "height") can either be selected as a fixed value for the modular silencer or can be selected as an integer multiple of a base height.

In a further embodiment, which can be combined with the above embodiments, the endless profile is planar or is designed as a cylinder or has a U-shape. In the case of a planar endless profile, the web or webs protrude from the plane, in particular vertically, so that n + 1 resonator chambers can be realized in the case of an air duct with a rectangular cross section with n webs (n be an integer). In the case of a cylindrical air duct, a cylindrical endless profile is appropriate, which in the simplest case has webs that protrude from its outer or inner wall and come into contact with the inner wall or outer wall of the air inlet in order to create cavities there through the through openings Become resonator chambers.

In a further embodiment, a cylindrical endless profile is provided and exists at least two annular partition walls projecting radially from the air inlet and / or from the endless profile. With these, the resonator chamber can be closed in the axial direction, so that it forms a closed chamber. From a manufacturing point of view, it makes sense that the component (air inlet or endless profile) that has the projecting webs also has the corresponding projecting partitions, but this is not mandatory. For example, if the endless profile has radially outwardly projecting webs, particularly when viewed in the circumferential direction, n ≥ 3 webs (n be an integer) at the same axial position, the annular partition walls can be positioned at the axial ends of the webs and there from the endless profile or protrude from the air inlet to close the resonator chambers.

In a further embodiment, a rectangular endless profile is provided and there are at least two rectangular partition walls that protrude from the air inlet and / or from the endless profile, in particular vertically protrude, with which the resonator chamber can be closed, as in the construction described in the last paragraph.

Furthermore, an embodiment can be implemented in which the endless profile is pushed over or into the air inlet to form a non-positive connection. Installation is therefore particularly easy and also allows a silencer to be provided retrospectively for existing vehicles, which eliminates disturbing noises. This solution is suitable for combinations of a dimensionally stable air duct and a dimensionally stable endless profile, particularly in the case of such parts made of metal or a hard plastic.

Furthermore, the air duct can be designed such that the endless profile is glued to the outer or inner wall of the air inlet, possibly by friction welding, or is sprayed onto it. This is particularly useful when both the air inlet and the endless profile are made of plastic, because in this case the components can be fixed against each other, which prevents rattling noises due to relative movements. A (subsequent) spraying of the continuous profile onto the air inlet is more appropriate if the spraying is to take place on the outer wall of the air duct, since cavities have to be created. This embodiment also allows appropriate air ducts to be subsequently provided with a silencer.

Furthermore, a further embodiment can be selected in which at least part of the resonator chambers is formed from a sound-absorbing material, for example from a nonwoven. For example, the walls of the resonator chambers can be designed in such a way that the air duct and / or the dimensionally stable endless profile consist of the sound-absorbing material. Additionally or alternatively, the interior of the resonator can contain such sound-absorbing material, which can also be viewed as part of the resonator. This enables sound attenuation in a wider frequency range.

Furthermore, it is possible for the endless profile of one or more of the above embodiments to have openings of different geometry and / or size. This means that any number of frequency ranges can be damped. In the case of drilled openings, for example, the drilling diameter correlates well with the resonance frequency. Attenuation of several resonance frequencies results when using several webs, because then several resonator chambers are created, each of which can be designed for damping a different resonance frequency.

As stated above, the resonator chambers are provided at the air inlet or outlet, and possibly in the interior thereof. In order to avoid a cross-sectional narrowing of the air flow there, the air inlet can have an expansion area, in particular an elongated expansion area. Additionally or alternatively, the expansion area can protrude beyond the muffler in the longitudinal direction, in particular by approximately 1 cm to approximately 10 cm, in order to facilitate connecting the sound-insulated air duct to further components.

A particularly practical use of the air duct described above is obtained if it is used in a motor vehicle to connect an inflow of people to introduce air into the vehicle interior, since the muffler can be arranged above it in the connection area. This enables efficient sound insulation very close to where the sound is generated. Other sound sources that can be dampened with the silencer described above are blowers that generate noise due to air acceleration, heat exchangers that can cause air release noises and flow channels in the fresh or recirculated air area of a motor vehicle air conditioning system.

In practical use, the user has a modular principle with a standardized connection dimension. For an air duct to be used, one or more endless profiles are provided in production, which define the dimensions of the respective resonator chambers. Depending on the frequencies to be damped, the through openings suitable in terms of geometry and cross section are then selected for the resonator chambers defined in this way, and these can be easily determined experimentally or by simulations. The air duct can also be used universally, because it can be part of an air guiding element or one To be part of a component of a motor vehicle heating, ventilation and / or air conditioning system, in particular an outflow or inflow of people or the air conditioner itself, or a component of an air or exhaust gas path of an internal combustion engine, in particular a turbocharger inlet or outlet. Use for the air path of a fuel cell drive is also possible. In all cases, the integration of the muffler at the air inlet or outlet results in a compact muffler with a minimal increase in installation space, in which the air duct described can also be a fitting or connecting piece.

1. a) Bereitstellen eines Endlosprofils mit mindestens einem abragenden Steg sowie eines Luftkanals mit einem Lufteinlass, wobei das Endlosprofil und/oder der Luftkanal durchgehende Öffnungen besitzt.
2. b) Anordnen des Endlosprofils derart, dass das Endlosprofil zusammen mit zumindest einem Teil einer Außenwand oder mit zumindest einem Teil einer Innenwand eines Lufteinlasses eines Luftkanals einen Schalldämpfer mit zumindest eine Resonatorkammer mit durchgehenden Öffnungen für eine Luftzufuhr bildet.

A second aspect of the invention relates to a method for providing a soundproofed air duct and a manufacturing method. It has the following steps:

1. a) Providing an endless profile with at least one projecting web and an air duct with an air inlet, the endless profile and / or the air duct having through openings.
2. b) Arranging the endless profile in such a way that the continuous profile forms, together with at least part of an outer wall or with at least part of an inner wall of an air inlet of an air duct, a silencer with at least one resonator chamber with through openings for an air supply.

This method makes it possible, particularly if the endless profile is pushed over or into the air inlet to form a non-positive connection, to provide an air duct with sound absorption in a particularly simple manner.

Another aspect relates to the use of an endless profile provided with at least one web and with openings to form a muffler on an air inlet of a component of a vehicle heating, ventilation and / or air conditioning system or on an air inlet of a component of an air or exhaust gas path of an internal combustion engine .

• 1a-e planare Endlosprofile;
• 2 eine erste Ausführungsform eines Luftkanals mit einem Endlosprofil;
• 3 -5 zylindrische Endlosprofile;
• 6 eine zweite Ausführungsform mit einem zylindrischen Endlosprofil gem. 5 mit nach außen abragenden Stegen;
• 7 eine dritte Ausführungsform einem zylindrischen Endlosprofil gem. 4 mit nach innen abragenden Stegen.

The invention will be explained in more detail below on the basis of exemplary embodiments. The figures used for this are not to scale and the same reference numerals designate the same components. Show it:

• 1a-e planar endless profiles;
• 2nd a first embodiment of an air duct with an endless profile;
• 3rd - 5 cylindrical endless profiles;
• 6 a second embodiment according to a cylindrical endless profile. 5 with outwardly projecting webs;
• 7 a third embodiment according to a cylindrical endless profile. 4th with inwardly projecting webs.

1a shows a portion of an elongated endless profile 1 in a top view and 1b corresponding to this as section AA. It is a planar endless profile 1 with three vertically protruding webs 2nd , 2 ' and 2 " and punched out circular openings 3rd .

1c shows another endless profile with only one web 2nd . One can see that the jetty 2nd either the full extent shown in dashed lines perpendicular to plane A of the endless profile 1 or, shown with a solid line, has a smaller extension so that its base point 4th shifts accordingly. By shortening the web 2nd can the endless profile 1 can be used for different sized air inlets The endless profile 1 can be made of metal or plastic (eg polypropylene).

1d and 1e show further endless profiles 1 where the webs are of different thickness ( 1d ) or with which more than two resonator chambers can be provided, in 1e namely four resonator chambers. Of course, depending on the dimensions of the air duct, more webs are possible. A single resonator chamber can be realized with a U-profile, not shown.

2nd shows an air duct 5 with a rectangular cross-sectional profile, inside the endless profile 1 of the 1b in the direction of the arrow P is inserted perpendicular to the cross-sectional or figure plane. The outside surfaces 6 , 6 ' of the endless profile 1 lie on the side walls 7 , 7 ' and the base points 4th , 4 ' and 4 " on the lower inner wall 7 " of the endless profile 1 on. This results in a first resonator chamber 8th between the bridges 2nd and 2 ' and a second resonator chamber 8th' between the bridges 2 ' and 2 " . In the longitudinal direction of the rectangular air duct 14 , in the direction of the arrow P , the resonator chambers 8th , 8th' each closed by a partition, not shown. This partition is in one piece with the endless profile 1 connected. In contrast, if you have the endless profile 1 rotated by 90 ° into the air inlet 14 inserts, then the function of the partitions is already from the outer surfaces of the 6 and 6 ' the outer webs 2nd and 2 " taken over, so that then no additional partitions are required.

Gas flows in the direction of the arrow P of the 2nd , part of it passes through the openings 3rd into the resonator chambers and dampens flow noise.

3rd shows a cylindrical air duct 5 in axial section and 4th correspondingly the same air duct 5 with a view towards the cylinder axis Z . The air duct 5 has a cylindrical endless profile 1 , the four from its inner wall 11 webs projecting radially inwards 2nd owns. The base points 4th the bridges 2nd lie on the outer wall of the air inlet 14 on. Between endless profiles 1 and air intake 14 this makes four resonator chambers 8th , 8th' , 8th" , 8th'" formed, each one opening 3rd possess through which air can flow. To close the four resonator chambers 8th , 8th' , 8th" , 8th'" there are partition walls in the axial direction 30th . The dividing walls, seen in the axial direction, are annular webs, which are radial from the endless profile 1 or from the air intake 5 can protrude. Depending on how many reonator chambers are required, this does not have to be a closed annulus.

The endless profile 1 can be cut to length and form a non-positive connection inside a cylindrical air inlet 14 be inserted. As an alternative, the webs can be selected which are arranged obliquely with respect to the radial direction or at an angle 0 0 ° thereto, preferably at an angle 45 45 °.

5 shows one too 4th alternative embodiment, in which the webs 2nd from the endless profile 1 project radially outwards and not radially inwards as in 4th . Here, too, there are the same partition walls 30th four resonator chambers 8th , 8th' , 8th" , 8th'" .

6 shows the arrangement of the endless profile 1 of the 5 in a cylindrical air inlet 14 in axial section, which at its outer end an elongated expansion area 9 having. The expansion area 9 is dimensioned in the radial direction so that the cylinder wall 21 of the endless profile 1 with the cylinder wall 21 ' of the air intake 14 in its unexpanded area. In 6 are the webs 2nd , 2 ' and 2 " of the endless profile 1 in a plane perpendicular to the cylinder axis Z or in the radial direction. Alternatively (not shown), the webs are arranged obliquely to this radial direction, in such a way that a web 2nd , 2 ' , 2 " in the curvature area 10th of the expansion area 9 roughly on the inner wall there 11 nestles, which avoids cross-sectional narrowing and leads to less turbulence in the air path. To ensure that only through the openings 3rd Air into the resonator chambers 8th , 8th' flows in this area of curvature 10th the inner wall 11 with the jetty 2nd be sealed sealed. Also, as in 4th shown, one of the resonator chambers 8th a sound-absorbing material, e.g. a wool fleece 20 , included in order to achieve a broadband sound attenuation. Even the endless profile 1 can consist of a sound absorbing material.

6 also shows the connection of the with the silencer 12th equipped vent 13 for blowing air into a vehicle interior. Because the expansion area 9 the silencer 12th The air intake can overlap in the longitudinal direction by a certain distance x 14 the one with slats 15 equipped vent 13 partly in the expansion area 9 inserted and in the overlap area with a seal 16 be sealed against false air.

7 shows a cylindrical air inlet 14 with an expansion area 9 but without a silencer 12th . Instead, the air outlet is only partially shown 13 a cylinder wall 21 " with an external silencer 12th . The silencer 12th is from the endless profile 1 formed, the inwardly projecting webs 2nd , 2 ' , 2 " owns. Again, the webs can be a plane perpendicular to the cylinder axis Z ingest or be arranged at an angle. The endless profile 1 is installed over the inlet 14 of the vent 13 pushed and forms two or more resonator chambers surrounding the air path 8th and 8th" , in the air through the openings 3rd the cylinder wall 21 " of the air intake 14 ' can flow in. The one with a silencer 12th equipped air inlet 14 is part of the vent 13 and can be expanded into another, with an expansion area 9 equipped air inlet 14 , here for example an air line, insert and with a seal 16 seal.

The embodiment of the 7 makes it possible to subsequently provide a silencer for an existing component by pushing the endless profile over the air inlet of the outflow to form at least two resonator chambers. Of course, this does not have to be a vent, but can be another component of a vehicle heating, ventilation and / or air conditioning system, for example an air conditioning compressor, a condenser, an air duct, etc.

Out 6 and 7 it can be seen that these two embodiments can also be combined, in which case the internal and external sound absorbers can be offset or arranged one behind the other as seen in the longitudinal direction.

It is also conceivable for a component of an air or exhaust gas path of an internal combustion engine, in particular of a turbocharger inlet or outlet or an intake or exhaust manifold or pure air line, etc. with such a silencer.

Reference list

1

Endless profile

2nd

web

2 '

web

2 "

web

3rd

opening

4th

Base

4 '

Base

4 "

Base

5

Air duct

6

Outside surface

6 '

Outside surface

7

Inner side forest

7 '

Side inner wall

7 "

lower inner wall

8th

Resonator chamber

8th'

Resonator chamber

8th"

Resonator chamber

9

Widening

10th

Area of curvature

11

Interior wall

12th

silencer

13

Air vent

14

Air intake

14 '

Air intake

15

Slat

16

poetry

17th

pipe

18th

Outer wall

19th

Footline

20

Wool fleece

21

Cylinder wall

21 '

Cylinder wall

21 "

Cylinder wall

30th

partition wall

Z.

Cylinder axis

P

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QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 202013105639 A1 [0002]
• DE 102016118583 A1 [0002]
• JP 2006123659 A [0002]

Claims (14)

Air duct for a motor vehicle with an air inlet (14) and an endless profile (1), the endless profile and / or the air inlet having through openings (3), in which the endless profile has at least one projecting web (2,2 ', 2 ") and wherein the endless profile (1) together with at least part of the outer wall (18) or with at least part of the inner wall (11) of the air inlet (14) comprises a silencer (12) with at least one resonator chamber (8, 8 ', 8 ") forms. Air duct after Claim 1 , in which the projecting end of the web (2,2 ', 2 ") rests on the outer wall (18) of the air inlet (14) and the through openings are provided in the air inlet. Air duct after Claim 1 , in which the projecting end of the web (2, 2 ', 2 ") rests on the inner wall (11) of the air inlet (14) and the through openings are provided in the endless profile. Air duct according to one of the Claims 1 to 3rd , in which the endless profile (1) is planar or cylindrical and has at least one outwardly or inwardly projecting web (2,2 ', 2 "). Air duct after Claim 4 , in which a cylindrical endless profile (1) is provided and two annular partition walls (30) projecting radially from the air inlet (14) and / or from the endless profile (1). Air duct after Claim 4 , in which a rectangular endless profile (1) is provided and two rectangular partition walls (30) projecting from the air inlet (14) and / or from the endless profile (1). Air duct according to one of the Claims 1 to 6 , in which the endless profile (1) is pushed over or into the air inlet (14) to form a non-positive connection. Air duct according to one of the Claims 1 to 7 , in which the endless profile (1) is glued to the outer or inner wall (11) of the air inlet (14) or sprayed on it. Air duct according to one of the Claims 1 to 8th , in which at least part of the resonator chambers (8, 8 ', 8 ") is formed from a sound-absorbing material. Air duct according to one of the Claims 1 to 9 , in which the endless profile (1) has openings (3) of different geometry and / or size. Air duct according to one of the Claims 1 to 10th , in which the air inlet has a radial expansion area (9). Air duct after Claim 11 , in which the expansion area (9) projects beyond the muffler in the longitudinal direction, in particular by approximately 1 cm to approximately 10 cm. Air duct according to one of the Claims 1 to 12th as part of a component of a motor vehicle heating, ventilation and / or air conditioning system, in particular a vent (13), or as part of a component of an air or exhaust gas path of an internal combustion engine or a fuel cell drive. Procedure with the following steps: a) providing an endless profile (1) with at least one projecting web (2,2 ', 2 ") and an air inlet (14), the endless profile and / or the air inlet having through openings (3). b) arranging the endless profile (1) such that the endless profile (1) together with at least part of an outer wall (18) or with at least part of an inner wall (11) of the air inlet (14) is a silencer (12) with at least one resonator chamber (8,8 ', 8 ") with through openings for air supply.

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