DE102009033773A1 - Radial fan housing - Google Patents

Abstract

The invention relates to a radial fan housing device (2) for ventilation devices of motor vehicles, which have a radial fan receiving space (3) bounded by a receiving space delimiting wall (6) and an air discharge duct (5) delimited by a duct wall (7). In this case, the tongue device (8) formed by the receiving space limiting wall (6) and the channel wall (7) is designed to be adjustable.

Description

The The invention relates to a radial fan housing for ventilation devices, especially for aerators of motor vehicles, which at least one of at least one Reception room boundary wall limited radial fan reception room and one Having at least one channel wall limited Luftabführkanal. In addition concerns the invention a blower device, in particular a blower device for a Motor vehicle. Furthermore, the invention relates to an air conditioning system, in particular an automotive air conditioning system. Finally, concerns the invention a method for operating a radial fan assembly.

In many areas of technology, especially in ventilation, heating and air conditioning of buildings and vehicles it is necessary to use technical Aids an air flow artificially to create. For This purpose, so-called fans or blowers have proven. Thereby Is it possible, inside rooms provided with a sufficient supply of air, wherein the supplied air optionally in advance by heat exchangers (radiator and / or Evaporator), filters and the like can be passed.

ever according to specific application need the fans or blower have different characteristics. While for example at a first application (such as a cooler of a Motor vehicle) primarily on a high air flow rate (and therefore a high cooling capacity) arrives, is in other applications, for example, a special low operating noise (For example, in the ventilation of a Motor vehicle interior) in the foreground.

to ventilation of interiors, in particular motor vehicle interiors, have particular radial fans proven. in principle fulfill such radial fans the ones assigned to them Satisfying tasks.

One Problem with the currently known centrifugal fans, however, is when used in strongly changing operating conditions to be, which is the case for example in the automotive sector is. Here, it usually proves necessary that the fan to one (or more) selected typical operating point is optimized. In the other operating points have to oppose Disadvantages (such as poor efficiency, unnecessary high Noise and noise like) to be consciously accepted. It's easy to understand that this is undesirable.

The The object of the invention thus consists in a radial fan housing device to propose, which is particularly universally applicable. In addition exists the object of the invention is a blower device and an air conditioner to propose, which is particularly universally applicable the object of the invention is to provide a method of operation a radial fan assembly to propose a particularly universal operation of a Radial fan arrangement allows.

To It is proposed a radial fan housing device for ventilation devices, especially for aerators of motor vehicles, which at least one of at least one Shelf boundary wall limited radial fan room and one of at least Channel wall limited Luftabführkanal has, in such a way that the transition between the at least one Receiving space limiting wall and the at least one channel wall forming Tongue device is designed at least partially adjustable and / or the frame device formed at least partially adjustable is. In particular, the adjustability of the tongue device or refers the frame device on a reversible adjustability. It means that The adjustability is not necessarily based on an initial fit the tongue device or the frame device for Time of installation of the radial fan housing device or the complete radial fan assembly refers. Rather, it is possible also to later Times an adjustment of the tongue device / the frame device make. In particular, it makes sense if customizability not just for example in a workshop or by a trained person Qualified personnel possible but on the contrary by the user of the device (for example a motor vehicle driver) carried out or adaptability can even be done automatically. Especially useful it is when the adaptability of the tongue device / the frame device during operation of the radial fan assembly itself can be made. The adaptability of the tongue device relates in particular on their length, their distance to the radial fan, the thickness, the shape (cross section, bevel on the leading edge and the like), etc. The adaptation relates to the frame device in particular their diameter, their shape, their air passage cross-section etc. In the rest it is also possible that with lengthening the tongue device reduces the air passage cross-section and vice versa.

It is advantageous if at least parts of the tongue device and / or at least parts of the frame device have at least one actuator device and / or at least one connection Have direction for connection to an actuator. With such a design, it is particularly easy to make an adjustability of the tongue device or the frame device during operation of the radial fan assembly, which is particularly advantageous. As an actuator device, for example, electrical control elements (electric motors, stepper motors and the like), mechanically acting actuator devices (control knobs, control levers, air-flowed flaps and the like), pneumatic actuator devices or other actuator devices can be used.

Especially It is advantageous if the tongue device at least one, preferably a plurality, such as in particular two, three, four or five tongue wall elements having. With such a training can usually be a special good compromise between particularly good adjustability and relative simple mechanical construction can be found. In particular it is possible that the tongue wall elements themselves are substantially rigid in themselves Elements are formed. The adjustability of the tongue device can then at least partially by a change in position the tongue wall elements result against each other.

A particularly advantageous embodiment arises when at least one of the tongue wall elements is movable, especially designed to be displaceable is. By this movable arrangement of at least one of the tongue wall elements can a change of position individual assemblies of the tongue device achieved against each other become. A particularly great adaptability the tongue device naturally results when a plurality, in particular all the tongue wall elements (possibly also other modules of the Tongue device) are designed to be movable.

Farther it makes sense if at least one of the tongue wall elements at least an at least partially asymmetric and / or at least one has at least partially symmetrical end face. tries have shown that such a training is particularly advantageous, especially in terms of noise reduction during operation the radial fan housing assembly can prove. In particular, an asymmetric design is at low air flow rates the radial fan assembly beneficial while a symmetrical design at higher or high air flow rates of Radial fan arrangement is beneficial. The symmetry refers in particular to an axis symmetry relative to a longitudinal axis of the respective tongue wall element (Which in particular perpendicular to the axis of rotation of the radial fan can stand).

When It has proven particularly useful if at least one of the Tongue wall elements at least one at least partially oblique, V-shaped, double V-shaped, triangular and / or has curved shape. Such forms have proven to be special advantageous, in particular as a particularly effective promoting and / or reduce noise proved. In particular, the V-shaped, double-V-shaped, triangular and / or curved shape can formed both above, as well as in the form of a recess become.

Advantageous it is furthermore, if at least parts of the tongue device in particular at least a part of the tongue wall elements and / or at least parts the frame device independently executed adjustable from each other are. With such a design, a particularly good adaptability the radial fan assembly to the respective operating conditions (operating points) are guaranteed.

It can be particularly useful if at least parts the frame device at least partially in terms of their Form and / or are designed to be adjustable in terms of their diameter. The adjustability can be achieved, for example, by partially covering using movable wall elements (including Elements of the frame device) take place. Also, it is possible the Frame device using several mutually displaceable Wall elements (which can cover at least partially) form. Especially For example, the frame device can be designed "like a blind" (analogous to shutters on cameras, for example).

Farther becomes a blower device, in particular a blower device for a Motor vehicle proposed, the at least one radial fan housing device having the structure described above. Also the blower device then has the advantages and properties already described in an analogous manner.

Farther It is proposed to use an air conditioning system, in particular an automotive air conditioning system at least one radial fan housing device and / or with at least one fan device to be provided with the structure described above. Also the air conditioning then has the advantages and properties already described in an analogous manner.

Finally, a method for operating a radial fan arrangement is proposed in which at least one tongue region and / or at least one tong region of the radial fan arrangement is selected During the operation of the radial fan assembly at least temporarily and / or at least partially changed. Again, the advantages and properties already described in particular in connection with the radial fan housing device result in an analogous manner. Also developments of the method in the sense of the devices already described are of course possible.

Especially Is it possible to carry out the process in such a way that change at least partially and / or at least temporarily depending from the operating conditions of the radial fan assembly, in particular dependent on from the air flow, from the speed of the centrifugal fan, from the performance of the radial fan and / or from the air back pressure. This way can be a special advantageous, possibly at least partially automated Adaptation of the radial fan arrangement be made possible at the respective operating point of the radial fan. This can be one allow a particularly high level of comfort, and above In addition, reduce or eliminate the risk of incorrect operation.

in the The invention will be described below with reference to advantageous embodiments and with reference to the accompanying drawings. Show it:

1 a first embodiment of a radial fan with adjustable tongue walls in a schematic plan view from above;

2 : a detail from 1 ;

3 : differently shaped tongue leading edges of different tongue walls;

4 : possible embodiments of a radial fan with adjustable frame.

In 1 is a schematic plan view from above of a first embodiment of a radial fan 1 with adjustable tongue area 8th shown. The radial fan 1 consists essentially of a housing 2 , which has a spiral-shaped radial fan-wheel receiving area 3 having. In radial fan wheel pickup area 3 is a radial fan 4 with a plurality of fan blades 9 arranged. The air intake for the radial fan 4 takes place in the usual way from a frame, which is arranged for example in front of or behind the plane of the drawing. Will the radial fan 4 rotated, air is transported radially outward. The thus-conveyed air flows into the spiral-shaped channel 10 coming from the outside of the radial fan 4 as well as from the radial fan receiving area 3 bounding spiral wall 6 is formed. From there, the pumped air through an air duct 5 Other areas of - in the present case only schematically illustrated - automotive air conditioning 11 where it is heated, cooled and / or filtered, for example.

The transition between the spiral wall 6 and one of the channel walls 7 of the air duct 5 forms the tongue area 8th out. This tongue area 8th is in 2 shown in an enlarged view.

First, the known, rigid tongue nose 12 to recognize. The tongue nose front edge 15 For example, a straight, parallel to the drive axle 14 of the radial fan 4 running tongue nose front edge 15 have (see also 3a ). Such a straight tongue leading edge 15 may occur under certain operating conditions of the radial fan 1 prove beneficial. In particular, it can be at particularly high air flow rates with only a very small back pressure advantage because they are particularly small areas of the outside of the Radialzuffterrads 4 blocked. If only a particularly low back pressure in the air duct 5 There are also backflow in the area of the tongue nose leading edge 15 largely negligible. As the - described in more detail below - sliding tongue walls 16 . 17 are in their retracted position, the resulting tongue area leading edge 13 from the shape of the tongue nose leading edge 15 certainly.

For other operating conditions of the radial fan 1 proves the straight tongue tongue leading edge 15 on the other hand, as disadvantageous. If z. B. at high air flow of the back pressure in the air duct 5 increases, so also the backflow of air in the tongue area 8th to. To prevent at least some of these backflows is an asymmetrical, v-shaped tongue leading edge 18 advantageous. A. relatively short length of the tongue is still required in order not to block the air mass flow promotion in the tongue-near area. To achieve such a tongue configuration, a first, slidably disposed tongue wall is formed 16 a little way to the front (in 1 and 2 to the left). The displaceability of the first tongue wall 16 (Analogously, the second tongue wall 17 ) is in 2 indicated by arrows. The shape of the leading edge 18 the first tongue wall 16 is in 3b shown. If the first tongue wall 16 pushed sufficiently far forward (for example, in the in 2 corresponding area indicated by dashes), the tongue area leading edge becomes 13 of the tongue area 8th through the front edge 18 the first tongue wall 16 Are defined. In other words, the air "sees" the leading edge 18 the first tongue wall 16 , (Of course this must be the second tongue wall 17 in their retracted position be Find.)

For operating points of the radial fan 1 with high throttling (high back pressure in the air duct 5 ) and reduced air flow rates, in contrast, a relatively long, asymmetrically shaped tongue is more advantageous to reduce the backflow. In this case, the asymmetrical shape can be a return flow (in particular also an asymmetrical return flow which, for example, due to the one-sided air supply through the frame 23 . 24 can be conditionally) particularly effectively prevent. To such a shape of the tongue area leading edge 13 to get the second tongue wall 17 pushed sufficiently far forward (where the first tongue wall 16 is reduced). As a result, now forms the leading edge 19 the second tongue wall the effective, resulting tongue area leading edge 13 , A possible shaping of the leading edge 19 the second tongue wall 17 is in 3c shown.

Of course it is just as possible that the two tongue walls 16 . 17 Pushed "additively" forward. So it is possible, for example, that the first tongue wall 16 remains in its extended position and the second tongue wall 17 even before the first tongue wall 16 is pushed, so that the air flow only the leading edge 19 the second tongue wall 17 with a "overlong" tongue wall "sees".

Usually, the (maximum) travel of the second tongue wall 17 greater than the (maximum) travel of the first tongue wall 16 selected. This is contrary to the corresponding particularly advantageous tongue configurations in the different operating points. Of course it is also possible to realize the same length of travel here. In addition, it is also possible that the radial fan 1 not only with "end rashes" of the first tongue wall 16 and / or the second tongue wall 17 can be operated. Rather, it may prove to be particularly advantageous if intermediate positions are used to realize particularly advantageous tongue configurations for certain operating points.

To avoid or reduce blade turning sound, it is particularly advantageous if the radial fan housing device 1 , in particular its first tongue wall 16 and / or their second tongue wall 17 are designed such that a constant (minimum) distance of the corresponding wall surface to the radial fan 4 is maintained.

The relative angles of attack between the leading edges 15 . 18 . 19 . 20 . 21 . 22 The corresponding tongue walls and the airflow passing them can be determined for various operating points using CFD calculations.

In 4 are finally conceivable embodiments of radial fans 1 with adjustable frame 23 . 24 shown. In 4a is the adjustable frame 23 formed such that its diameter between a maximum diameter 25a and a minimum diameter 25b can be adjusted. In 4b Again, the adjustable frame 24b in terms of their shape using a sliding cover plate 26 changeable.

LIST OF REFERENCE NUMBERS

1

radial fans

2

casing

3

Radiallüfterradaufnahmebereich

4

radial fan

5

air duct

6

spiral wall

7

channel wall

8th

tongue area

9

fan blades

10

slot

11

Automotive air conditioning system

12

tongue nose

13

Tongue portion leading edge

14

drive axle

fifteen

Tongue Nose leading edge

16

first tongue wall

17

second tongue wall

18

leading edge (of 16)

19

leading edge (from 17)

20

leading edge

21

leading edge

22

leading edge

23

adjustable frame

24

adjustable frame

25

diameter

26

cover

Claims (12)

Radial fan housing device ( 2 ) for ventilation devices ( 1 . 11 ), in particular for ventilation devices ( 1 . 11 ) of motor vehicles, comprising at least one of at least one receiving space boundary wall ( 6 ) limited radial fan storage room ( 3 ) and one of at least one channel wall ( 7 ) limited air discharge channel ( 5 ), characterized in that the transition between the at least one receiving space boundary wall ( 6 ) and the at least one channel wall ( 7 ) forming tongue device ( 8th ) is at least partially adjustable and / or the Zargenvorrichtung ( 23 . 24 ) is formed at least partially adjustable. Radial fan housing device ( 2 ) according to claim 1, characterized in that at least parts of the tongue device ( 8th ) and / or at least parts of the frame device ( 23 . 24 ) comprise at least one actuator device and / or have at least one connection device for connection to an actuator device. Radial fan housing device ( 2 ) according to claim 1 or 2, characterized in that the tongue device ( 8th ) at least one, preferably a plurality, in particular two, three, four or five tongue wall elements ( 16 . 17 ) having. Radial fan housing device ( 2 ) according to one of the preceding claims, characterized in that at least one of the tongue wall elements ( 16 . 17 ) is movable, in particular displaceable. Radial fan housing device ( 2 ) according to one of the preceding claims, characterized in that at least one of the tongue wall elements ( 16 . 17 ) at least one at least partially asymmetric ( 19 . 21 . 22 ) and / or at least one at least partially symmetric ( 15 . 18 . 20 ) Has front side. Radial fan housing device ( 2 ) according to one of the preceding claims, in particular according to claim 5, characterized in that at least one of the tongue wall elements ( 16 . 17 ) at least one at least partially oblique ( 19 ), V-shaped ( 18 . 20 . 21 . 22 ), double V-shaped, triangular and / or curved shape. Radial fan housing device ( 2 ) according to one of the preceding claims, characterized in that at least parts of the tongue device ( 8th ) and / or at least parts of the frame device ( 23 . 24 ), in particular at least part of the tongue wall elements ( 16 . 17 ) are made independently adjustable. Radial fan housing device ( 2 ) according to one of the preceding claims, characterized in that at least parts of the frame device ( 23 . 24 ) at least regionally in terms of their shape ( 24 ) and / or in terms of their diameter ( 23 ) are adjustable. Blower device ( 1 ), in particular blower device ( 1 ) for a motor vehicle, comprising at least one radial fan housing device ( 2 ) according to one of claims 1 to 8. Air conditioning ( 11 ), in particular motor vehicle air conditioning system, comprising at least one radial fan housing device ( 2 ) according to one of claims 1 to 8 and / or at least one blower device ( 1 ) according to claim 9. Method for operating a radial fan arrangement ( 1 ), characterized in that at least one tongue area ( 8th ) and / or at least one frame area ( 23 . 24 ) of the radial fan assembly ( 1 ) during operation of the radial fan assembly ( 1 ) is changed at least temporarily and / or at least partially. A method according to claim 10, characterized in that the change at least partially and / or at least temporarily, depending on the operating conditions of the radial fan assembly ( 1 ), in particular as a function of the air flow, of the rotational speed of the radial fan ( 4 ) and / or the performance of the radial fan ( 4 ) and / or from the air back pressure.

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