DE102008017121A1 - fan housing - Google Patents

Abstract

The invention relates to a fan housing (1, 18) for a radial fan device (3). The blower housing (1, 18) has a radial fan receiving space (2) with a fluid inflow channel (7) and a fluid outflow channel (5), as well as a fluid guide device (10, 19). In this case, the extent of the fluid guide device (10, 19) is less than the extent of the fluid channel (5, 7), in which the Fluidleitvorrichtung (10, 19) is arranged.

Description

The The invention relates to a fan housing for a Radial fan device. Furthermore, the invention relates a blower device with such a blower housing.

fan are always needed when an air flow artificially produced. It is irrelevant whether it's getting air into a room, out of a room, or air from a room to transport to another. Instead of air it can of course, it's also about another gas, which, for example, also drops of liquid (fog) and / or particulate matter (smoke).

at Blowers there are a variety of characteristics, such as the maximum air flow rate, the generated pressure difference, the Energy needs of the blower available stationary energy form (eg electrical energy or mechanical energy) Energy of a crankshaft), the space requirement of the blower, the insensitivity to contamination, the resistance towards aggressive media as well as the operation of the Blower generated noise.

ever according to purpose can be regarding this Characteristics give different priorities. If at a field of application, for example, relatively high operating noise or a relatively large required space tolerated can be, so are in other applications operating noise in particular undesirable and / or the Available space is in particular limited.

Also It is not uncommon for a single technical Apparatus for operating a plurality of blower devices required are. It is also possible that at different Places of such a technical device different Priorities related to the characteristics of the used Blower available.

One Example of such a technical device, in the multiple blowers of different designs used are motor vehicles, especially land-based motor vehicles.

For example Among other things, automobiles have a fan running at higher load conditions additional cooling of the coolant cooler, oil cooler and / or condenser of an automotive air conditioning system by applying effected with an air flow. Here it comes in particular to one highest possible air flow with the smallest possible required space.

One Another fan is found in the air conditioning of the motor vehicle. Here, with the help of the blower, a fresh air supply in the interior of the motor vehicle into it, a circulating air flow of the motor vehicle interior, or a mixture of both produced. The supplied or circulated air is thereby if necessary (as far as the specific form of the motor vehicle air conditioning realized) heated by a radiator through cooled (and dehumidified) an evaporator through Filter cleaned and through air distributor on different exhaust nozzles distributed in the motor vehicle interior. In addition to one possible small space and a larger air flow is with the blowers used there above all things a particularly low operating noise relevant. This especially applies to the part of the operating noise, which is discharged into the vehicle interior.

Next The absolute operating noise is also the nature of the Operating noise of relevance. This is how operating noise becomes felt uncomfortable in certain, narrow frequency intervals (Howling), whereas a as even as possible Noise across all frequency ranges (so-called "white Noise ") is tolerated sooner. Special are also low-frequency Operating noise, especially those in the field From about 75 Hz to 200 Hz are considered particularly unpleasant.

Around a least disturbing operating noise to generate already different proposals for noise reduction and noise reduction Made devices.

A Possibility of noise reduction exists, for example in the use of quietest fan wheels. However, the achievable noise abatement are so far in practice insufficient to meet the increasing comfort requirements be sufficient in the automotive field.

Further For example, measures include the use of sound-insulating materials on the insides of the air ducts are attached. But also With such measures, the operating noise can be the blower does not lower to a level that is rising Comfort requirements in the automotive sector could meet.

In the meantime, it has already been proposed to use active noise reduction (ANR) systems for reducing the noise level in the motor vehicle interior. Such system However, they are still complex and expensive. In addition, only "unwanted noise" should be damped, but not conversations between the occupants themselves, the music system of the vehicle or even some outside noise such as sirens or loudspeaker announcements. This still presents the design of ANR systems with unsolved challenges.

Another starting point is the use of air-conducting elements, which are installed in certain places in the air ducts to keep the air flow laminar or on the contrary to produce desired air turbulence in certain special areas, so as to reduce the noise emitted by the blower fan as far as possible to reduce. Such devices are made, for example CH 399 645 . DE-OS 1 501 958 . DE-GM 1 854 515 or DE-OS 29 29 140 become known in connection with cross-flow fans. In this context, it has also been proposed to make the air guide elements adjustable in order to adapt to different operating conditions of the fan can.

in the Connection with centrifugal fans has also been proposed to provide the air-supplying frame with a frame ring, or to provide a Zargenabdeckung to the flow as possible quietly into the fan wheel into it.

however show the air-conducting elements described so far a usually insufficient sound insulation capacity.

The The object of the invention is therefore a blower housing to propose for radial fan, which is an improved Has noise emission behavior. Continue to exist the object of the invention is a blower device to suggest with an improved noise emission behavior.

It it is proposed to use a blower housing for a radial fan device having at least one radial fan receiving space with at least one fluid inflow channel, at least one Fluidabströmkanal, and at least one Fluidleitvorrichtung has, in such a way that the extent of at least one Fluid guide device less than the extent of the fluid channel is, in which the fluid guiding device is arranged. Under a Fluid channel is in particular a Fluidzuströmkanal and / or to understand a Fluidabströmkanal. The inventors have surprisingly discovered that with many fans in terms of the generated operating noise not only harmless is the "length" of a Fluidleitvorrichtung shorter than the dimension of the fluid channel equivalent. But it can rather in comparison with air guide elements, which essentially completely penetrate the fluid channel, come to reduced operating noise. About that In addition, the "shortening" of the louvers also come to a reduction of the air attack cross section, so that the flow resistance facing the air flow can be reduced. This in turn can cause that the fan power can be reduced, what the Can reduce noise emissions again. Even if so a relatively small shortening of the length of the fluid guiding device (s) lead to a noticeable decrease in the noise emission can, it has proved to be advantageous if the expansion the fluid guiding device is less than or equal to 75%, 70%, 66.67%, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 33.33%, 30%, 25%, 20%, 15%, 10% and / or 5% corresponds to the corresponding extent of the air flow channel. In this regard, it should be noted that under the expansion a Fluidleitvorrichtung usually its width to understand in the transverse direction of the direction of fluid flow is. The thickness of the corresponding fluid guiding device can be analogous to known Fluidleitvorrichtungen be designed. In addition to the usual observable reduction of the total noise emission In addition, the proposed device often also a reduction of the particularly disturbing low-frequency Noise, especially in the frequency range of 75 Hz ≤ f ≤ 200 Hz. Incidentally, are related with the present description not only conventional radial fans, where the air supply through the inside of a fan drum takes place, and the air discharge in the tangential and / or radial direction takes place, but also other designs, such as in particular cross-flow fan, at where both air supply and air delivery in tangential and / or radial direction, to be understood. Also mixed forms are of course conceivable. The radial fan receiving space can especially in the case of "classic" radial fans in the form of a fan spiral. The fluid drainage channel in particular at an angle to the tangential direction be arranged of the radial fan receiving space. Especially Angular ranges from 5 ° to 40 °, 10 ° to 35 °, 15 ° to 30 ° and 20 ° to 25 ° between the tangential direction and the direction of the Fluidabströmkanals can be particularly advantageous be.

A meaningful development of the blower housing may result if at least one fluid guiding device is arranged in a fluid outflow channel. Experiments have shown that the noise suppression can be particularly effective when at least one of the Fluidleitvorrichtungen is arranged in a Fluidabströmkanal. This can lead to an interaction with otherwise particularly strongly noise-causing fluid which has been accelerated by the fan. This can be one noticeably lower and / or more pleasant operating noise of the blower.

Possible It is still the case that the blower housing Extension of the at least one fluid guiding device in a parallel extending to the axial direction of the radial fan receiving space Direction and / or in a to the axial direction of the radial fan receiving space vertical direction and / or in a parallel to a adjacent to the wall of the fluid channel is lower, as the extension of the fluid channel in which the fluid guide is arranged. With such an orientation can usually the best noise reduction effects be effected. Here seems a commonly occurring narrow fluid passage cross section between Fluidleitvorrichtung and wall of the fluid channel advantageous to the noise emission behavior to impact. The distance between the wall and Fluidleitvorrichtung should not more than (less than) 30%, 25%, 20%, 15%, 10% and 5% of the channel width. Especially amazing it is that just a chosen perpendicular to the previous arrangement directions Arrangement of the Fluidleitvorrichtung particularly noise-reducing can work.

A further possible development of the blower housing arises when at least one fluid channel, in particular at least a Fluidabströmkanal, at least partially along one in the radial plane of the radial fan receiving space lying and / or at least one fluid channel, in particular at least one fluid inflow channel at least partially along a plane perpendicular to the radial plane of the radial fan receiving space Direction runs. The previous test results have shown, the Fluidleitvorrichtungen are particularly effective when they realized in connection with the "classic" radial fan assembly become. Of course, angles are also possible slightly different from the proposed "ideal form", especially if the deviation is less than 10 °, especially preferably less than 5 °.

A Another possible design of the blower housing results if at least one fluid guiding device in an overflow region is located near an approximation from Fluidzuströmkanal and Fluidabströmkanal and / or in Area of a connecting edge of two fluid channel walls, in particular in the area between inlet frame and impeller or Zargenspalt located. The areas mentioned are usually characterized noted that in their area particularly large pressure differences, particular in relation to other areas of the Blower device, can occur. The use the Fluidleitvorrichtungen at the proposed location proves to be therefore usually considered to be particularly effective. In the overflow area it may in particular be the area where the fluid supply channel the fan cowl and the Fluidabströmkanal immediately adjacent lie to each other. Due to never complete in practice To avoid leaks, these are usually also up fluidly connected to a certain extent. Furthermore, can it is in the overflow region in particular around the (acute-angled) connection area between the radial fan compartment and Fluidabführkanal act. Also in this area are in usually very high pressure differences before and it is due of sealing problems in practice some fluidic connection in front.

Farther It is suggested that the blower housing at least one fluid guiding device has a shape, which one and / or multiple shape features taken from the group are the wing-like shapes, teardrop-shaped Shapes, elliptical shapes, plate-like shapes, rectangular ones Shapes, triangular shapes, trapezoidal shapes, rounded ones Shapes, forms with convex boundary edges, shapes with concave ones Bounding edges and shapes with wavy boundary edges includes. The proposed forms have been in the past Try proved to be particularly suitable. The convex or concave ones Limiting edges can especially on Iuvseitigen or be arranged teeseitigen areas of Fluidleitvorrichtung.

Farther It is suggested that the blower housing at least one fluid guide adjustable, in particular rotatable and / or displaceable. By such Training, the fan housing to the respective operating condition be adjusted. Usually it behaves namely, so that the optimal shape and arrangement the fluid guiding device (s) are changing Operating conditions also changes. By the adjustable Arrangement of the Fluidleitvorrichtung (s) can therefore usually a larger operating range are covered.

Possible It is still that with the blower housing the main plane of at least one fluid guiding device parallel to Axial direction of the radial fan receiving space runs and / or perpendicular to the axial direction of the radial fan receiving space stands. With such an arrangement of Fluidleitvorrichtung can again improved noise reduction effects result.

Furthermore, a blower device, in particular a blower device for motor vehicles, preferably a blower device for ventilating a motor vehicle interior, is proposed, which has at least one radial fan and which has a fan housing with the structure described above. Such a blower device can be developed in an analogous manner as described with respect to the blower housing and has the advantages and properties described in an analogous manner.

in the The invention will be described below with reference to advantageous embodiments and with reference to the accompanying drawings explained. It shows:

1 a first embodiment of a blower with an air guide in a schematic, perspective view;

2 : this in 1 embodiment shown in a schematic plan view from above;

3 : this in 1 shown embodiment in a schematic plan view from the front;

4 : schematic plan views of embodiments of air guide elements;

5 : schematic cross sections through embodiments of air guide elements;

6 a second embodiment of a blower with an air guide in a schematic plan view from the front;

7 : this in 6 illustrated embodiment in a schematic plan view from the front.

In 1 is a blower in a schematic, perspective view 1 an automotive air conditioning system with a radial fan 3 shown. The radial fan 3 is in one for radial fan wheels 3 suitable receiving space, a so-called fan spiral 2 added. For illustrative purposes, is in 1 only a partial section of the blower 1 shown.

In 1 is on the right side the tongue 4 to recognize the air outlet duct 5 from the fan spiral 2 separates. The from the radial fan 3 delivered air passes through the air outlet channel 5 through and is discharged for example via suitable air distributor and Luftausströmerdüsen in the motor vehicle interior and possibly pre-processed in a conventional manner with the help of radiators, evaporators and filters, if not already seen in the flow direction before the Radialzuffterrad 3 is done.

On the air intake side 6 of the radial fan 3 is a frame 7 provided at the a Zamb cuff 8th is attached, which is a little way into the inner cavity 9 of the radial fan 3 reaches into it.

Adjacent to the air inlet side 6 of the radial fan 3 is luvseitig in front of the tongue 4 an air guide 10 arranged. The air guide 10 is on a handrail 11 attached. In the present embodiment, the support rod 11 connected to (not shown here) servomotors, so that the air guide 10 on the one hand around the axis of the handrail 11 can be panned (double arrow A), on the other hand can be moved (double arrow B). This allows the air guide 10 closer to the tongue 4 or further from the tongue 4 be placed away so that its angle of attack to the incoming air or its distance from the tongue 4 can be adapted to the respective operating conditions.

In the present embodiment, the air guide element 10 formed with triangular shape and plate-like cross-section. However, other shapes may be used.

As 1 can be removed, the height of the air guide is 10 in the illustrated embodiment, about one third of the total height of the air outlet channel 5 , The height of the air outlet duct 5 corresponds in the illustrated embodiment (as usual otherwise) in about the height of the fan spiral 2 , the height of the radial fan wheel 3 or the height of the tongue 4 , As already mentioned, the air guide 10 despite its small dimensions effective noise reduction, especially in the low-frequency range.

In 2 is that in 1 illustrated blower 1 to recognize in a plan view from above. In other words, the view corresponds to the viewing direction of the air inlet side 6 out.

In 3 is that in the 1 and 2 illustrated blower 1 additionally shown in a side view. Furthermore, in 3 the drive motor 12 of the radial fan 3 and the drive shaft 13 of the radial fan 3 shown.

Only for the sake of completeness, it is pointed out that the bottom and the lid of the in 1 to 3 illustrated blower housing 20 not shown for reasons of better visibility.

In 4 are exemplarily several different conceivable forms for air guide elements 10a - 10e shown.

At the in 4a illustrated, substantially triangular air guide 10a is the airflow facing windward edge 14a of the air guide ment 10a convexly curved. By contrast, the windward edge facing the air flow 14b of in 4b illustrated air guide 10b concave. When in 4c illustrated air guide 10c it is a kind of mixed form of convex 14a and concave 14b Windward edge, leaving a "wave-shaped" windward edge 14c results.

As in the 4d and 4e can also be a rectangular basic shape 10d or a trapezoidal basic shape 10e be used for the air guide. Again, the windward edge 14d . 14e not only (as shown in the drawing) rectilinear, but also be convex, concave or wavy.

Incidentally, in all embodiments, the Leekante 15a -E or one or more side edges 16a -E of the respective air guide element 10a Be convex, concave and / or wavy.

In 5 are exemplary different conceivable cross-sectional shapes 17g -J of air deflectors 10g -J shown. The cross-sectional shape 17g For example, -j can be like a plate 17g , drop-like 17h , wing profile-like 17i or elliptical 17j be educated.

It is also possible, any conceivable shaping (see, for. 4 ) with any conceivable cross-sectional shape (cf. 5 ) to combine.

In 6 Finally, is still a second embodiment of a fan 18 shown. 7 shows that in 6 illustrated blower 18 seen from the side.

The fan 18 from its basic structure corresponds largely to the in 1 shown blower 18 , Unlike the in 1 shown blower 1 is at the present blower 18 however, the air guide 19 differently formed and arranged. In the illustrated embodiment, it is a horizontally disposed air guide 19 which luvseitig the tongue 4 is arranged, and about half as wide as it is the width of the Luftausströmkanals 5 equivalent.

In analogy to in 1 shown blower 1 is also present in the air guide 19 rotatable (double arrow C) and slidable (double arrow B) arranged so that it varies on different operating conditions of the blower 18 can be adjusted.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - CH 399645 [0014]
• - DE 1501958 [0014]
• - DE 1854515 [0014]
• - DE 2929140 [0014]

Claims (9)

Blower housing ( 1 . 18 ) for a radial fan device ( 3 ), comprising at least one radial fan receiving space ( 2 ) with at least one fluid inflow channel ( 7 ), at least one fluid drainage channel ( 5 ), as well as at least one fluid guiding device ( 10 . 19 ), characterized in that the extension of at least one fluid guiding device ( 10 . 19 ) smaller than the extent of the fluid channel ( 5 . 7 ), in which the fluid guiding device ( 10 . 19 ) is arranged. Blower housing ( 1 . 18 ) according to claim 1, characterized in that at least one fluid guiding device ( 10 . 19 ) in a fluid drainage channel ( 5 ) is arranged. Blower housing ( 1 . 18 ) according to claim 1 or 2, characterized in that the extension of the at least one fluid guiding device ( 10 . 19 ) in a direction parallel to the axial direction of the radial fan receiving space ( 2 ) extending direction and / or in a to the axial direction of the radial fan receiving space ( 2 ) perpendicular direction and / or in a parallel to an adjacent wall of the fluid channel ( 5 . 7 ) is less than the extent of the fluid channel ( 5 . 7 ), in which the fluid guiding device ( 10 . 19 ) is arranged. Blower housing ( 1 . 18 ) according to one of the preceding claims, characterized in that at least one fluid channel ( 5 . 7 ), in particular at least one fluid outlet channel ( 5 ), at least in regions along a in the radial plane of the radial fan receiving space ( 2 ) and / or at least one fluid channel ( 5 . 7 ), in particular at least one fluid inflow channel ( 7 ) at least partially along a plane perpendicular to the radial plane of the radial fan receiving space ( 2 ) lying in the direction ( 1 ). Blower housing ( 1 . 18 ) according to one of the preceding claims, characterized in that at least one fluid guiding device ( 10 . 19 ) in an overflow area ( 4 . 8th ) located near an approach of Fluidzuströmkanal ( 7 ) and fluid drainage channel ( 5 ) and / or in the region of a connecting edge ( 4 ) is located two fluid channel walls. Blower housing ( 1 . 18 ) according to one of the preceding claims, characterized in that at least one fluid guiding device ( 10 . 19 ) has a shape having one and / or more shape features taken from the group, the wing-like shapes ( 17j ), drop-shaped forms ( 17h ), ellipsoidal forms ( 17j ), plate-like forms ( 17g ), rectangular shapes ( 10d ), triangular shapes ( 10a . 10b . 10c ), trapezoidal shapes ( 10e ), rounded shapes, shapes with convex boundary edges ( 14a ), Forms with concave boundary edges ( 14b ) and forms with wavy boundary edges ( 14c ). Blower housing ( 1 . 18 ) according to one of the preceding claims, characterized in that at least one fluid guiding device ( 10 . 19 ) adjustable, in particular rotatable (A, C) and / or displaceable (B) is executed. Blower housing ( 1 . 18 ) according to one of the preceding claims, characterized in that the main plane of at least one fluid guiding device ( 10 . 19 ) parallel to the axial direction of the radial fan receiving space ( 2 ) runs ( 1 ) and / or perpendicular to the axial direction of the radial fan receiving space ( 2 ) stands ( 6 ). Blower device, in particular a blower device for motor vehicles, preferably a blower device for ventilation of a motor vehicle interior, comprising at least one radial fan ( 3 ), characterized by a blower housing ( 1 . 18 ) according to one of claims 1 to 8.