DE102016102383B4 - air guiding device - Google Patents

Abstract

Air guiding device (1), having- a housing body (2; 10) with at least one air guiding duct (6) and- at least one sound outlet opening (7; 11) introduced into the housing body (2) of at least one air guiding duct (6), wherein- the housing body ( 2; 10) is covered on the outside with at least one open-pored sound-insulating body (3), which covers at least one sound outlet opening (7; 11) over its entire surface and the sound-insulating body (3) is fixed to the housing body (2, 10) by means of at least one holding device (8). and is pressed onto the housing body (2, 10) over a large area and as a result projects a short distance into the air duct (6) in the covered sound outlet opening (7; 11).

Description

The invention relates to an air duct device, having a housing body with at least one air duct. The invention also relates to a vehicle with at least one such air guiding device. The invention is particularly applicable to motor vehicles, in particular for ducting air from air conditioning units.

Noise suppression in vehicles, especially in electric cars, is becoming increasingly important. To suppress noise in air ducts, sound-absorbing acoustic pads are currently installed in their air ducts. This results in the disadvantage that the air volume or throughput volume is reduced.

DE 38 30 346 A1 discloses a sound-absorbing air duct element made from a tubular, corrugated, flexible base element and a sound-absorbing material connected to it. The sound absorbing material is preferably an open-pore foam made of polymeric material. The corrugated base element has circumferential perforations at a defined distance from one another in its outwardly directed corrugation tips.

A mat of sound-absorbing material is stretched over the outer circumference of the base element. At least one receiving chamber for the sound waves is formed between the mat and the wave troughs of the basic element. As a result, air can escape from the base element through the peripheral perforations past the sound-absorbing material and into the at least one receiving chamber. The sound-absorbing material therefore does not cover the entire surface of the perforations, but only arches them over.

DE 35 36 379 A1 discloses an air duct, in particular in motor vehicles, with sound-absorbing materials, which is designed for easier production and better soundproofing in such a way that the air duct is self-supporting, at least in longitudinal sections, exclusively from sound-absorbing material, in particular polyurethane flake composite foam.

Out of EP 1 022 505 A1 a tube for transporting fluids and gases is known, in which a membrane is laid over an opening on the outside, which membrane is intended to dampen the noise level. Furthermore, from the DE 102 61 081 B3 an air guide element is known, in which a sound-absorbing component is used in such a way that the ends of the sound-absorbing component are encapsulated by the material of the air guide element. Also from the DE 10 2008 061 363 A1 there is known an air duct that achieves the reduction of noise of a low frequency range at the initial engine starting operation by inserting a filter in a side wall. The filter attaches to an air hole and is made of PU foam and held in place by a support cover or welded on the outside.

JP H06-156053 A discloses a duct structure for an air conditioner of a vehicle.

It is the object of the present invention to at least partially overcome the disadvantages of the prior art and in particular to provide a particularly compact option for soundproofing that has no noticeable effect on an air throughput volume.

This object is solved according to the features of the independent claims. Preferred embodiments can be found in particular in the dependent claims.

The object is achieved by an air duct device, having a housing body with at least one air duct and at least one opening made in the housing body (hereinafter also referred to as “sound outlet opening” without loss of generality) of at least one air duct, the housing body being covered on the outside with at least one sound insulating body is that covers at least one sound outlet opening over its entire surface.

The air-guiding device has at least one holding device for fixing at least one sound-insulating body to the base body. This results in the advantage that the sound-insulating body can be attached to the base body in a particularly targeted manner, in particular also to a free-standing base body. In addition, the use of a holding device in particular also enables the sound-insulating body to be easily detached from the base body. The holding element can be a separate holding device or can be permanently attached to the base body.

Examples of a retaining device include screw devices, clips, hooks, rubber bands, straps, clamping slots, etc.

In addition, at least one soundproofing body can be hung, glued, welded (e.g. ultrasonically welded), hot-joined, clamped, crimped, etc. to the base body for its attachment or fixation. Gluing can be achieved particularly easily by means of at least one double-sided adhesive tape.

The sound insulation body is pressed onto the base body over a large area. This ensures that the sound insulation body rests on the base body, even with frequent and/or violent movements of the air guiding device, and consequently an air path past the sound insulation body (e.g. between the sound insulation body and the base body) can be prevented in a particularly reliable manner. In addition, assembly-related distortions of the sound-insulating body can be compensated for or corrected.

Large-area pressing can be understood in particular as pressing outside the at least one sound outlet opening with at least 75% of the surface available for this, in particular with at least 90% of the surface available for this, in particular with practically 100% of the surface available for this ( full-surface pressing).

This achieves the advantage that sound waves penetrating through the air inlet into the air duct are not passed on practically undamped through the air duct, but at least partially hit the sound insulating body or sound absorbing body at the at least one sound outlet opening and are damped, in particular absorbed, by it. The housing body is therefore also used for soundproofing or soundproofing. In this case, a flow cross section of the air duct is not reduced or is not noticeably reduced. The sound-insulating body therefore exerts no or no noticeable influence on the air flow rate or air flow rate through the at least one air duct. The soundproofing can also be achieved in a particularly compact manner, so that there is only a small effect on the installation space. In addition, such an air guiding device can be implemented inexpensively. In addition, in contrast to a housing body consisting entirely of soundproofing material, high structural stability can still be achieved.

The air duct device can also be referred to as an air duct, air duct component, air duct, etc.

The air routing device is provided and set up to route air, in particular breathable air. In particular, it is not intended to carry exhaust gases and/or hot gases.

So that the sound emerging from the sound outlet openings cannot propagate away from the air guiding device, the sound outlet opening is covered over the entire surface. In particular, there is no path for sound waves that leads out of the sound outlet opening and past the sound-insulating body. This type of soundproofing is therefore basically suitable for housing bodies of any shape, in particular also for those housing bodies in which the at least one sound outlet opening is made in a smooth (e.g. flat or slightly curved) surface of the housing body.

The at least one air duct has at least one associated air inlet (also called “air inlet opening”) and at least one associated air outlet (also called “air outlet opening”). The air inlet and the air outlet are therefore air-technically connected to one another by at least one air duct. These openings provided for the passage of air are openings that are different from the at least one sound outlet opening. The air duct is formed by a cavity in the housing body or corresponds to a cavity in the housing body. The housing body thus forms the wall of the air duct.

The sound outlet opening in particular connects an air duct to an outside of the housing body and is introduced into an area of the housing body which forms a wall of the air duct.

The housing body is in particular a plastic part and can be designed, for example, as an injection-molded part, a blow-moulded part or blow-moulded body, as integral foam or molded foam or Mucell (physically and chemically foamed) or using similar methods. However, the housing body can also consist of metal, ceramics, fiber composite material, etc.

It is a particularly advantageous embodiment that the housing body is a chemically foamed blown body, i.e. the housing body has been blown using a chemical blowing agent. This has the advantage that the base body contains pores, e.g. with a pore content between 5% and 30%. The base body can be closed-pored or open-pored. This results in the advantage that the base body itself can be designed to be sound-absorbing using particularly simple means. The associated sound absorption can already be so effective that the at least one sound outlet opening and the at least one sound insulating body can be dispensed with. Consequently, the air guiding device can also consist only of the chemically foamed blown body.

In general, the base body can be sound-absorbing or non-sound-absorbing (“sound-neutral”).

The sound outlet openings, which are designed as openings, for example, can be produced later by punching, laser cutting, milling, sawing, cutting, etc. The breakthroughs can be produced in particular by off-tool methods. The at least one sound outlet opening can already have been produced with the housing body, for example by means of a suitably designed injection mold.

In order to achieve a particularly compact design, the sound-insulating body can be designed as a mat, layer or film.

The material of the sound-insulating body can consist of needle felt, mesh material, viscose staple, open-pore foam or similar materials. Organically produced felts and wool or silk can also be used. The sound insulation body can also consist of a mixed component - e.g. B. plastic with an insulating component - exist.

The sound-insulating body protrudes into at least one sound outlet opening covered by it. and even protrude through the sound outlet opening and thereby protrude slightly (i.e. without a noticeable reduction in the flow cross section) into the air duct. In this way, a particularly effective soundproofing can also be achieved when an increase in volume caused by the at least one soundproofing body is to be kept particularly low.

Another configuration is that at least one sound-insulating body is an open-pored sound-insulating body. Open-pored sound insulation bodies generally have a somewhat better sound insulation effect than closed-pore sound insulation bodies. In addition, a variety of usable open-pored sound insulation bodies is particularly high. The advantage of closed-pore sound insulation bodies is that they are more airtight.

In general, a sound-insulating body can dampen sound more effectively the lower its density. Consequently, it is advantageous if the sound-insulating body has a noticeably lower density than the base body, in particular a density that is at least 25% lower, in particular a density that is at least 50% lower. For this purpose, however, the sound-insulating body can also be a non-porous body.

Another configuration is that at least one sound outlet opening is a rounded sound outlet opening. This supports the long-term stability of the housing body particularly effectively. This exploits the fact that cracks caused by permanent mechanical stress (e.g. vibrations) tend to occur in the area of sharp edges or corners, which is avoided by the rounded sound outlet opening(s). Rounded sound outlet openings can be, for example, circular or oval holes, slits with rounded ends, shapes with an angular basic shape but rounded corners, and so on.

It is a particularly advantageous embodiment that at least one holding device is a hose-like holding device. Due to the hose-like or tubular configuration, the sound-insulating body can be pressed onto the base body over a large area and evenly in a simple manner. It can enclose the base body, in particular in the circumferential direction.

Another configuration is that at least one holding device is a shrink tube. The use of a shrink tube has the advantage that the sound-insulating body can be attached particularly firmly to the base body over a large area, in particular it can be pressed onto it. In addition, a structural stabilization of the base body can be achieved by a shrink tube, which can possibly be weakened by the introduction of the at least one sound outlet opening.

It is a further development that at least one shrink tube has no opening. For example, the shrink tube can also be used as an airtight cover. Alternatively, the shrink tube can have at least one opening (e.g. at least one hole, in particular an at least approximately circular hole).

It is an alternative or additional configuration that at least one holding device is an elastic tubular net. The use of a hose network has the advantage that it does not need to be post-treated in order to fix the sound-insulating body to the base body, in particular to press it on. For example, the tubing can be mesh-formed or made of plastic or injection molding.

In yet another embodiment, at least one sound-insulating body is covered in an airtight manner. This results in the advantage that an exchange of air between the air duct and the area surrounding the air guiding device can be prevented in a simple, inexpensive and compact manner. The airtight cover can be implemented, for example, by means of a barrier film, e.g., a plastic film. As an alternative or in addition, the sound-insulating body can have an air-impermeable barrier film.

The object is also achieved by a vehicle having at least one air guiding device as described above. By using the air duct device, disturbing noise entering there can be damped, so that in particular improved acoustics of an interior and/or an exterior of the vehicle can be achieved.

The vehicle can be a motor vehicle, in particular a passenger car, a truck or a bus. The vehicle can also be an aircraft, such as an airplane or a helicopter.

However, the air flow device is not limited to vehicles, but can also be used in the field of building services (e.g. in air conditioning and ventilation systems) and industrial technology. The object is thus also achieved by a building services installation or an industrial installation which has at least one air guiding device as described above. In particular, the building services installation or the industrial installation can be a building services air-conditioning system, a building services ventilation system, an industrial technology air-conditioning system or an industrial technology ventilation system.

It is a further development that the air-guiding device is air-technically connected to an air-conditioning device. As a result, a transmission of a noise generated by the air conditioner into an interior of the vehicle can be reduced. A suppression or even practically an interruption of a noise flow from air conditioners in the air duct will thus be achieved. Consequently, improved acoustics in the interior of the vehicle are achieved.

• 1 zeigt in Draufsicht einen Grundkörper mit einem darauf aufgelegten Schalldämmkörper zur Herstellung einer Luftleitvorrichtung;
• 2 zeigt in Draufsicht die Luftleitvorrichtung, bei der zusätzlich zu den Komponenten aus 1 der Schalldämmkörper mittels einer Haltevorrichtung an dem Grundkörper fixiert ist;
• 3 zeigt die Luftleitvorrichtung aus 2 als Schnittdarstellung in Vorderansicht; und
• 4 zeigt in Draufsicht einen weiteren Grundkörper mit einem darauf aufgelegten Schalldämmkörper zur Herstellung einer Luftleitvorrichtung.

The characteristics, features and advantages of this invention described above, and the manner in which they are achieved, will become clearer and more clearly understood in connection with the following schematic description of an exemplary embodiment, which will be explained in more detail in connection with the drawings.

• 1 shows a top view of a base body with a sound-insulating body placed thereon for the production of an air guiding device;
• 2 shows the air guiding device in plan view, in which in addition to the components from 1 the sound-insulating body is fixed to the base body by means of a holding device;
• 3 shows the air guide device 2 as a sectional view in front view; and
• 4 shows a top view of another base body with a sound-insulating body placed thereon for the production of an air guiding device.

1 shows a top view of a tubular base body 2 with a mat-like or layer-like sound-insulating body 3 placed thereon for producing an air-guiding device 1 of a vehicle F. The vehicle F can be a motor vehicle or an aircraft, for example.

The base body 2 can be a chemically foamed blow-molded body made of plastic, which itself is sound-absorbing or sound-absorbing.

The base body 2 has an air inlet 4 on one end face and an air outlet 5 on its other end face. Air inlet 4 and air outlet 5 are connected to each other through the hollow interior of the base body 2, which acts as an air duct 6 (see also 3 ) serves. The base body 2 is in particular a self-supporting plastic part that has been produced, for example, by injection molding or blow molding.

In the (side) wall of the base body 2 there are several sound outlet openings 7 shown in dashed lines, which connect the air duct 6 to an outside of the base body 2 . The sound outlet openings 7 are designed here as a series of circular or oval holes.

The sound insulation body 3 placed on the outside of the base body 2 covers the sound outlet openings 7 over the entire surface, so that no air between the base body 2 and the sound insulation body 3 can escape from the sound outlet openings 7 . For this purpose, the sound-insulating body 3 rests in such a way that it completely surrounds the sound outlet openings 7 .

The soundproofing body 3 is an open-pored, mat-shaped or layered body whose density is considerably lower than the density of the base body 2. The soundproofing body 3 can be made of needled felt, rayon, open-pore foam or similar materials, for example. Also - e.g. biologically produced - felt and wool or silk can be used. The sound insulation body 3 can also consist of a mixed component - e.g. B. plastic with an insulating component - exist.

2 shows the air guiding device 1 in a plan view, in which the sound-insulating body 3 is additionally fixed to the base body 2 by means of a holding device in the form of a tubular shrink tube 8 . For this purpose, the shrink tube 8 is pulled over the base body 2 and the soundproofing body 3 and then shrunk, for example by hot air treatment. Thereby the shrink tube 8 presses the sound insulation body 3 over a large area onto the base body 2.

The shrink tube 8 can have openings 9, e.g. several round openings 9 here. The number, size, shape and arrangement of the openings 9 can vary. The openings 9 can also be arranged in a single row along a longitudinal extension of the base body 2, can be larger, etc.

3 shows the air guiding device 1 as a sectional illustration in a front view, ie in a view of a sectional plane AA 2 . Since the shrink tube 8 presses the sound insulation body 3 against the base body 2 over a large area, the material of the sound insulation body 3 can expand into the sound outlet openings 7 and thus protrude there (and in one variant even protrude a short distance through the sound outlet openings 7 into the air duct 6 , without illustration).

The at least one sound insulation body 3 can also be covered to be airtight, e.g. by means of an airtight barrier film (not shown). Such a barrier film can, for example, be arranged between the sound-insulating body 3 and the shrink tube 8 or cover the shrink tube 8 on the outside. However, the blocking film can also represent a part of the sound-insulating body 3 . A further possibility of preventing an exchange of air between the air-guiding duct 6 and the area surrounding the air-guiding device 1 is to use a shrink tube without openings.

An air guiding device 1 used in the vehicle F can, for example, be air-technically connected to an air conditioning unit (not illustrated) of the vehicle F. Sound waves generated by the air conditioner in the air conducted through the air duct 6 are absorbed by the sound insulation body 3 and noise damping is thus achieved.

4 shows a plan view of another tubular base body 10 with a sound-insulating body 3 placed thereon for the production of an air guiding device, e.g. analogous to the production of the air guiding device 1.

In contrast to the base body 2 , the base body 10 has a rectangular sound outlet opening 11 . This features rounded corners to improve durability under vibration loads.

Both the base body 2 and the base body 10 can have sound outlet openings 7 and 11 at a number of points in the circumferential direction of the base body 2 and 10, e.g. at opposite positions.

Of course, the present invention is not limited to the embodiment shown.

The base body may not only be tubular, but may have any other desired shape.

Also, instead of the heat-shrinkable tubing, an elastic tubing net can be used, for example, which simply needs to be pulled open in order to press the sound-insulating body onto the base body.

Furthermore, the air guiding device can also do without a separate holding device, for example by the sound-insulating body being glued to the base body. In the 1 and 4 The components shown can then already show a finished air guiding device. In addition, the sound-insulating body can only be attached locally to the base body, for example by means of a number of screws, hooks or clips. As a result, the sound-insulating body can be kept under tensile stress.

The air guiding device 1 can also be part of a domestic appliance technology system or an industrial technology system.

In general, "a", "an" etc. can be understood as a singular or a plural number, in particular in the sense of "at least one" or "one or more" etc., as long as this is not explicitly excluded, e.g. by the expression "exactly a" etc.

A numerical specification can also include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

Reference List

1

air guide device

2

Base body, housing body

3

sound insulation body

4

air intake

5

air outlet

6

air duct

7

sound outlet opening

8th

Holding device, shrink tubing

9

opening in the shrink tubing

10

Base body, housing body

11

sound outlet opening

f

vehicle

Claims (13)

Air guiding device (1), having - A housing body (2; 10) with at least one air duct (6) and - At least one in the housing body (2) introduced sound outlet opening (7; 11) of at least one air duct (6), wherein - the housing body (2; 10) is covered on the outside with at least one open-pored sound insulation body (3) which covers at least one sound outlet opening (7; 11) over its entire surface and the sound insulation body (3) is attached to the housing body (2nd , 10) is fixed and pressed onto the housing body (2, 10) over a large area and as a result projects a short distance into the air duct (6) in the covered sound outlet opening (7; 11). Air guiding device (1) after claim 1 , wherein the housing body (2; 10) is a blow-molded part or blow-molded body, in particular blown by means of a chemical blowing agent and with a porosity of 5% to 30%. Air guiding device (1) according to one of the preceding claims, wherein the open-pored sound-insulating body (3) is a needled felt, material made from a mesh, rayon staple or open-pored foam. Air guiding device (1) according to one of the preceding claims, wherein at least one sound outlet opening (7; 11) is a rounded sound outlet opening (7; 11). Air guiding device (1) according to one of the preceding claims, wherein at least one holding device (8) is a hose-like holding device (8). Air guiding device (1) according to one of the preceding claims, wherein at least one holding device (8) is a shrink tube. Air guiding device (1) according to one of Claims 5 or 6 , wherein at least one holding device is an elastic tubular net. Air guiding device (1) according to one of the preceding claims, wherein at least one sound-insulating body (3) is covered in an airtight manner. Air guiding device (1) according to any one of the preceding claims, wherein the housing body (2; 10) is a chemically foamed blown body. Vehicle having at least one air guiding device (1) according to one of the preceding claims. vehicle after claim 10 , wherein at least one air-guiding device (1) is air-technically connected to an air-conditioning device. vehicle after one of Claims 10 or 11 , wherein the vehicle is an automobile or an aircraft. Domestic or industrial installation, having at least one air duct device (1) according to one of Claims 1 until 9 .

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