EP2275687A2 - Radial ventilator housing - Google Patents

Abstract

The apparatus has a radial fan wheel receiving region limited by a spiral wall, and an air channel limited by a channel wall. A tongue region (8) forming a transition between the spiral wall and the channel wall is designed in a partially adjustable manner and/or bezels are designed in a sectionally adjustable manner. Parts of the tongue region and/or parts of the bezels include an actuator device and/or a connecting device for connection to the actuator device. The tongue region includes tongue walls (16, 17) with tongue wall leading edges (18, 19), respectively. An independent claim is also included for a method for operating a radial fan assembly.

Description

The invention relates to a radial fan housing for ventilation devices, in particular for ventilation devices of motor vehicles, which have at least one bounded by at least one receiving space boundary wall radial fan receiving space and a limited at least one channel wall Luftabführkanal. In addition, the invention relates to a blower device, in particular a blower device for a motor vehicle. Furthermore, the invention relates to an air conditioner, in particular an automotive air conditioning system. Finally, the invention relates to a method for operating a radial fan assembly.

In many fields of engineering, such as ventilation, heating and air conditioning of buildings and vehicles, it is necessary to artificially generate airflow using engineering equipment. For this purpose, so-called fans or blowers have been proven. This makes it possible to have interior spaces with a sufficient supply of air to be provided, wherein the supplied air may optionally be preceded by heat exchanger (radiator and / or evaporator), filters and the like can be passed.

Depending on the specific application, the fan or blower must have different characteristics. While, for example, in a first application (such as in a radiator of a motor vehicle) primarily depends on a high air flow rate (and thus on a high cooling capacity), in other applications, for example, a particularly low operating noise (for example in the ventilation of a motor vehicle interior) in the foreground ,

For ventilation of interiors, in particular motor vehicle interiors, in particular radial fans have proven themselves. Basically, such radial fans satisfy the tasks assigned to them satisfactorily.

A problem with the currently known centrifugal fans, however, is when they are to be used in strongly changing operating conditions, which is the case for example in the automotive sector. Here, it generally proves necessary to optimize the blower to one (or more) selected typical operating point. In the other operating points, however, disadvantages (such as poor efficiency, unnecessary high noise and the like) must be consciously accepted. It is easy to see that this is undesirable.

The object of the invention is therefore to propose a radial fan housing device, which is particularly universally applicable. In addition, the object of the invention is to propose a blower device and an air conditioner, which is particularly universally applicable Furthermore, the object of the invention It is to propose a method for operating a radial fan assembly, which allows a particularly universal operation of a radial fan assembly.

For this purpose, it is proposed that a radial fan housing device for ventilation devices, in particular for ventilation devices of motor vehicles, which has at least one limited by at least one receiving boundary wall radial fan and an at least channel wall Luftabführkanal further such that the transition between the at least one receiving space boundary wall and the at least one channel wall forming tongue device is at least partially adjustable and / or the frame device is at least partially adjustable. In particular, the adjustability of the tongue device or the frame device refers to a reversible adjustability. That is, the adjustability does not necessarily relate to an initial adjustment of the tongue device at the time of mounting the radial fan housing device or the complete radial fan assembly, respectively. Rather, it is possible to make an adjustment of the tongue device / the frame device also at later times. In particular, it is useful if the adaptability is not only possible, for example, in a workshop or by trained personnel, but quite the opposite of the user of the device (for example, a motor vehicle driver) can be performed, or the adaptability is even automatic. It is particularly useful in this case if the adaptability of the tongue device / frame device can be carried out during operation of the radial fan arrangement itself. The adaptability of the tongue device relates in particular to its length, the distance to the radial fan, its thickness, its shape (cross section, bevel on the leading edge and the like), etc .. The adaptation in the frame device refers in particular to their Diameter, their shape, their air passage cross-section whose position with respect to the tongue nose leading edge, etc. .. Incidentally, it is also possible that with the lengthening of the tongue device, the air passage cross-section is reduced 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 have at least one connection device for connection to an actuator device. 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.

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

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

Furthermore, it is useful if at least one of the tongue wall elements has at least one at least partially asymmetrical and / or at least one at least partially symmetrical end face. Experiments have shown that such a design can prove to be particularly advantageous, in particular with respect to a reduction in noise during operation of the radial fan housing. In particular, an asymmetrical design at low air flow rates of the radial fan assembly is advantageous, while a symmetrical design at higher or high air flow rates of the radial fan assembly is advantageous. The symmetry relates in particular to an axis symmetry relative to a longitudinal axis of the respective tongue wall element (which may in particular be perpendicular to the axis of rotation of the radial fan).

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

It is furthermore advantageous if at least parts of the tongue device, in particular at least part of the tongue wall elements and / or at least parts of the frame device, are designed to be adjustable independently of one another. With such a design, a particularly good adaptability of the radial fan assembly to the respective operating conditions (operating points) can be ensured.

It may prove to be particularly useful if at least parts of the frame device are designed at least partially adjustable in terms of their shape and / or in terms of their diameter. The adjustability can be done, for example, by partially covering using movable wall elements (including elements of the frame device). It is also possible, the frame device using a plurality of mutually displaceable wall elements (which can cover at least partially) form. In particular, the frame device can be formed "like a glare" (for example analogously to shutters in cameras).

Furthermore, a blower device, in particular a blower device for a motor vehicle is proposed, which has at least one Radialiüftergehäusevorrichtung device having the structure described above. The blower device then has the advantage and properties already described in an analogous manner.

Furthermore, it is proposed to provide an air conditioning system, in particular an automotive air conditioning system with at least one radial fan housing device and / or with at least one fan device with the structure described above. The air conditioning system 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 area and / or at least one frame area of the radial fan arrangement is changed at least temporarily and / or at least in regions during operation of the radial fan arrangement. 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 selbstverstandtich possible.

In particular, it is possible to carry out the method in such a way that the change takes place at least partially and / or at least temporarily as a function of the operating conditions of the radial fan arrangement, in particular as a function of the air throughput, the rotational speed of the radial fan, the power of the radial fan and / or the air back pressure , In this way, a particularly advantageous, optionally at least partially automated adaptation of the radial fan assembly to the respective operating point of the radial fan can be made possible. This can allow a particularly high level of comfort, and also reduce or eliminate the risk of incorrect operation.

Fig. 1:

ein erstes Ausführungsbeispiel für einen Radiallüfter mit ver- stellbaren Zungenwänden in schematischer Draufsicht von oben;

Fig. 2:

einen Detailausschnitt aus Fig. 1;

Fig. 3:

unterschiedlich ausgebildete Zungenvorderkanten unterschied- licher Zungenwände;

Fig. 4:

mögliche Ausführungsbeispiele für einen Radiallüfter mit ver- stellbarer Zarge.

In the following the invention will be explained in more detail by means of advantageous embodiments and with reference to the accompanying drawings. Show it:

Fig. 1:

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

Fig. 2:

a detail from Fig. 1 ;

3:

differently shaped tongue leading edges of different tongue walls;

4:

Possible embodiments of a radial fan with adjustable frame.

In Fig. 1 is a schematic plan view from above of a first embodiment of a radial fan 1 with adjustable tongue portion 8 is shown. The radial fan 1 essentially consists of a housing 2 which has a spiral-shaped radial fan-wheel receiving area 3.
In the radial fan-wheel receiving area 3, a radial fan 4 is arranged with a plurality of fan blades 9. 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. When the radial fan 4 is rotated, air is conveyed radially outward. The thus-conveyed air flows into the spiral-shaped channel 10, which is formed by the outside of the radial fan 4 and the spiral wall 6 delimiting the radial fan receiving area 3.
From there, the conveyed air is supplied via an air duct 5 to other areas of the vehicle air conditioning system 11, which is shown here only schematically, 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 channel 5 forms the tongue area 8. This tongue area 8 is in Fig. 2 shown in an enlarged view.

First, the known, rigid tongue nose 12 can be seen. The tongue-nose front edge 15 may, for example, have a straight tongue-nose leading edge 15 running parallel to the drive axis 14 of the radial fan 4 (see also FIG Fig. 3a ). Such a straight tongue leading edge 15 may prove advantageous under certain operating conditions of the radial fan 1. In particular, it can be at particularly high air flow rates with only a very small back pressure advantage because it blocks very small areas of the outside of the radial fan 4. If only a particularly low back pressure in the air duct 5 prevails, also backflow in the area of the tongue nose leading edge 15 are largely negligible. Since the - described in more detail below - sliding tongue walls 16, 17 are in their retracted position, the resulting tongue area leading edge 13 is determined by the shape of the tongue nose leading edge 15.

In other operating conditions of the radial fan 1, however, the straight tongue tab leading edge 15 proves to be disadvantageous. If z. B. at high air flow, the back pressure in the air duct 5 increases, so also the backflow of air in the tongue area 8 to. In order to prevent at least some of these backflows, an asymmetrical, v-shaped tongue leading edge 18 is 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. In order to achieve such a tongue configuration, a first, displaceably arranged tongue wall 16 is extended a little way forward (in FIG Fig. 1 and 2 to the left). The displaceability of the first tongue wall 16 (analogously, the second tongue wall 17) is in Fig. 2 indicated by arrows. The shape of the front edge 18 of the first tongue wall 16 is in Fig. 3b shown. When the first tongue wall 16 is pushed sufficiently far forward (for example, in the in Fig. 2 corresponding area indicated by dashes), the tongue area leading edge 13 of the tongue area 8 is defined by the front edge 18 of the first tongue wall 16. In other words, the air "sees" the leading edge 18 of the first tongue wall 16. (Of course, the second tongue wall 17 must be in its retracted position.)

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

Of course, it is equally possible that the two tongue walls 16, 17 "additive" pushed forward. Thus, for example, it is possible that the first tongue wall 16 remains in its extended position and the second tongue wall 17 is pushed in front of the first tongue wall 16, such that the air flow only the leading edge 19 of the second tongue wall 17 with an "overlong" tongue wall " sees ".

Usually, the (maximum) travel of the second tongue wall 17 is greater than the (maximum) travel of the first tongue wall 16 is 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 of course also possible that the radial fan 1 can not only be operated with "end deflections" of the first tongue wall 16 and / or the second tongue wall 17. Rather, it may prove to be particularly advantageous if intermediate positions are used to special To realize advantageous tongue configurations for certain operating points.

In order 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 its second tongue wall 17 are designed such that a constant (minimum) distance of the corresponding wall surface is maintained to the radial fan 4.

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

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

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

15:

Tongue Nose leading edge

16:

first tongue wall

17:

second tongue wall

18:

Leading edge (from 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)

A radial fan housing device (2) for ventilation devices (1, 11), in particular for ventilation devices (1, 11) of motor vehicles, comprising at least one radial fan receiving space (3) delimited by at least one receiving space boundary wall (6) and an air discharge channel bounded by at least one channel wall (7) ( 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 (8) is at least partially adjustable and / or the frame device (23, 24) formed at least partially adjustable is. The radial fan housing device (2) according to claim 1, characterized in that at least parts of the tongue device (8) and / or at least parts of the frame device (23, 24) have at least one actuator device and / or at least one connection device for connection to an actuator device. A radial fan housing device (2) according to claim 1 or 2, characterized in that the tongue device (8) at least one, preferably a plurality, in particular two, three, four or five tongue wall elements (16, 17). 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 designed to be 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 asymmetrical (19, 21, 22) and / or at least one at least partially symmetrical (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), has 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 (8) and / or at least parts of the frame device (23, 24), in particular at least a 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 partially with respect to their shape (24) and / or in terms of their diameter (23) and / or position relative to the tongue nose leading edge ( 15) are adjustable. Blower device (1), in particular a 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 system (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 fan device (1) according to claim 9. Method for operating a radial fan arrangement (1), characterized in that at least one tongue region (8) and / or at least one frame region (23, 24) of the radial fan assembly (1) during operation of the radial fan assembly (1) at least temporarily and / or at least partially is changed. 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 depending on the air flow, the speed of the radial fan (4) and / or the power of the Radial fan (4) and / or effected by the air back pressure.

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