EP4481202A1 - Impeller for radial fan - Google Patents

Abstract

Impeller 1 of a radial fan for conveying a gaseous fluid, the impeller 1 comprising a base disk 2, a cover disk 3, wherein the cover disk 3 is arranged at a distance from the base disk 2 in the axial direction 15 of the impeller 1, wherein the cover disk 3 and/or the base disk 2 have at least one embossed bead 5, in particular a plurality of embossed beads 5, a plurality of blades 7, wherein at least one blade 7 is arranged between the cover disk 3 and the base disk 2 and is fastened in the region and in the course of at least one bead 5, wherein a surface course of the bead 5 follows a surface course of the blade 7 fastened to the bead 5, at least in one envelope, such that a conveying effect of the bead 5 corresponds at least to a conveying effect of a blade area 8 reduced due to the bead 5.

Description

The present invention relates to the technical field of impellers for radial fans for conveying a gaseous fluid.

Impellers for radial fans are already known to the expert from the state of the art.

The document EP 2 846 046 A1 discloses, for example, a fan wheel for conveying a gaseous fluid with a plurality of blades which are arranged at a constant angular pitch in an annular volume around a rotation axis and which are each fixed to a support means with their axially opposite end regions. It is characteristic that at least one blade has an edge region, in particular a frame-shaped peripheral region, and at least one inner region surrounded by the edge region, wherein between the edge region and the inner region at least one bead is formed along an at least L-shaped, preferably U-shaped, in particular peripheral curve and/or wherein the edge region is determined by a first blade surface and the inner region is determined by a second blade surface which is arranged and/or formed geometrically differently from the first blade surface.

Furthermore, impellers of radial fans are known, which comprise flat base disks and cover disks on which blades are attached.

The disadvantage here is always that, for example, an increase in the speed stability is accompanied by a loss of the conveying effect of the impeller or an increase in the conveying effect negatively affects the speed stability.

The technical object of the invention is therefore to propose an improvement in the speed stability while maintaining at least the same conveying effect of an impeller of a radial fan.

The technical problem is solved by an object having the technical features according to the independent claim. Advantageous embodiments are the subject of the dependent claims, the description and the drawings.

In the sense of the invention, it is provided that the proposed designs can relate to all components of the impeller, for example made of metal, but also only to individual components of the impeller. In the sense of the invention, the components of an impeller are understood to mean the cover plate, base plate and blades. In the sense of the invention, it is also provided that the proposed designs can relate to all blades of an impeller, but also only to individual blades of an impeller. In other words, a design of only one of the aforementioned components can be advantageous, but a design of all components achieves the most advantages.

For the purposes of the invention, a width of the bead is understood to mean a width in a plan view in the axial direction of the impeller.

Furthermore, in the sense of the invention, a height of the bead is to be understood as a positive or negative height in the axial direction, starting from the cover and/or base plate, of the impeller.

According to one aspect, the technical object of the invention is achieved by an impeller of a radial fan for conveying a gaseous fluid, the impeller comprising a base plate, a cover plate, wherein the cover plate is arranged at a distance from the base plate in the axial direction of the impeller, wherein the cover plate and/or the base plate have at least one embossed bead, in particular a plurality of embossed bead, a plurality of blades, wherein at least one blade is arranged between the cover plate and the base plate and is fastened in the region and in the course of at least one bead, wherein a surface course of the bead follows a surface course of the blade fastened to the bead, at least in an envelope, such that a conveying effect of the bead corresponds at least to a conveying effect of a blade area reduced due to the bead.

In the sense of the invention, an envelope can be understood as, for example, a contour or a surface that surrounds the object enclosed by it, such as the blade.

This can advantageously make it possible to shorten the blade and at the same time stiffen the base plate. For example, it can be provided to emboss beads in the cover and/or base plate in the direction of the blades. The blade then sits on, at, or in these beads and is thereby shortened and adapted in shape, which means that the Leverage ratios can be improved and the transition between the blade and the cover and/or base disk can be made less stressed. The stresses that occur in the entire impeller during operation of the impeller can thus be reduced. In particular, stresses that are introduced from the blades into the cover and/or base disk can be advantageously reduced. The strength of the impeller can thus be increased and higher rotational speeds, or higher circumferential speeds, can thus be achieved.

In addition, costs can be reduced and greater flexibility in the design of a wheel can be achieved.

In a technically advantageous embodiment of the impeller, it is provided that the blade is arranged on the bead, in particular on the bead, preferably in the bead.

This can further increase the flexibility in the manufacture of a wheel.

In a further technically advantageous embodiment of the impeller, it is provided that the bead is embossed along a contour of the blade, in particular along a contour of an edge region of the blade adjacent to the cover disk or the base disk.

This can also advantageously improve the stability and strength of the wheel.

Furthermore, in a further technically advantageous embodiment of the impeller, it is provided that a height of the bead varies and in particular increases in the radial direction of the impeller.

This allows special requirements to be taken into account when using the impeller and the production to be adapted accordingly in order to additionally increase the strength of the impeller.

Furthermore, in a further technically advantageous embodiment of the impeller, it is provided that the height of the bead corresponds to a tenth part, in particular a fifteenth part, in particular a twentieth part, preferably at most a fiftieth part, of a distance between the base plate and the cover plate.

This can also further increase the possibilities for manufacturing taking into account given application requirements.

Furthermore, in a further technically advantageous embodiment of the impeller, it is provided that a width of the bead varies and in particular increases in the radial direction of the impeller.

This can also further increase the stability and strength of the impeller and offer flexible manufacturing options for given requirements when using the impeller.

Furthermore, in a further technically advantageous embodiment of the impeller, it is provided that the bead is interrupted in the radial direction of the impeller, in particular is only partially formed.

This can offer additional advantageous possibilities for the production and use of the impeller.

Furthermore, in a further technically advantageous embodiment of the impeller, it is provided that the bead, in particular a flank of the bead, is formed parallel or profiled to the blade, preferably to a contour of the blade.

In other words, the shape of the bead can be parallel to the blade, but it can also have a profile shape, for example in an arrangement in the middle of the blade, which can have an additional beneficial effect on the stability and strength of the impeller.

Furthermore, in a further technically advantageous embodiment of the impeller, it is provided that the bead has a pressure-side profile, in particular a pressure-side contour profile, which deviates from a suction-side profile of the bead, in particular a suction-side contour profile of the bead.

This can also advantageously enable more flexible production to improve the stability and strength of the impeller.

Furthermore, in a further technically advantageous embodiment of the impeller, it is provided that the bead, in particular a bead outlet of the bead, has a, preferably partially, curvature-continuous transition into the base plate and/or into the cover plate.

In heavily loaded areas, this can be beneficial for providing additional stability.

Furthermore, in a further technically advantageous embodiment of the impeller, it is provided that the blade is fastened by means of a welded and/or lashed and/or screwed and/or riveted and/or glued and/or caulked connection, wherein the fastening is arranged in particular on the pressure side and/or suction side of the blade.

In this way, the advantages already mentioned can be combined with the advantages of inexpensive production or production adapted to given requirements.

Furthermore, in a technically advantageous embodiment of the impeller, it is provided that the fastening is designed in several parts, wherein either at least a first part of the fastening is formed between the blade and the base plate and at least a second part of the fastening is formed between the blade and the bead, or wherein at least a first part of the fastening is formed between the blade and the cover plate and at least a second part of the fastening is formed between the blade and the bead.

Advantageously, the blade can be attached to the base plate or the cover plate or the bead with particular stability and a higher flexibility in production can thus be achieved.

Furthermore, in a further technically advantageous embodiment of the impeller, it is provided that the blade is arranged between a pair of beads, wherein the pair of beads comprises a first and a second bead, wherein the first bead is arranged on the cover disk and the second bead is arranged on the base disk is formed, wherein in particular the first and/or the second bead are formed according to one of the preceding claims.

According to a further aspect, the technical object of the invention is achieved by a radial fan comprising a housing, a motor, in particular a control device, and an impeller for conveying a gaseous fluid, characterized in that the impeller is designed according to one of the preceding claims.

This can also further improve flexibility during production and increase strength.

Embodiments of the invention are shown schematically in the figures and are described in more detail below.

Figur 1

eine perspektivische Ansicht eines Laufrades;

Figur 2

eine weitere perspektivische Ansicht des Laufrades;

Figur 3

eine weitere perspektivische Ansicht des Laufrades;

Figur 4

eine Draufsicht einer Bodenscheibe;

Figur 5

eine Draufsicht einer Bodenscheibe mit Schaufeln; sowie

Figur 6

eine Draufsicht einer Bodenscheibe mit Schaufeln.

They show:

Figure 1

a perspective view of a wheel;

Figure 2

another perspective view of the wheel;

Figure 3

another perspective view of the wheel;

Figure 4

a top view of a floor disk;

Figure 5

a top view of a bottom disk with blades; and

Figure 6

a top view of a bottom disk with blades.

In Figure 1 is a perspective view of an impeller 1 of a radial fan for conveying a gaseous fluid, comprising a base plate 2, a cover plate 3, wherein the cover plate 3 is spaced from the base plate 2 in the axial direction of the impeller 1 and is arranged at a distance 4 between the base plate 2 and the cover plate 3, wherein the cover plate 3 and the base plate 2 have at least one embossed Bead 5, in particular a plurality of embossed beads 5, a plurality of blades 7, wherein at least one blade 7 is arranged between the cover disk 3 and the base disk 2 and is fastened in the region and in the course of at least one bead 5, wherein a surface course of the bead 5 follows a surface course of the blade fastened to the bead 5, at least in an envelope, such that a conveying effect of the bead 5 corresponds at least to a conveying effect of a blade surface 8 reduced due to the bead. The blade 7 can thereby advantageously be shortened and at the same time a stiffening of the base disk 2 and/or the cover disk 3 can be achieved.

Furthermore, in Figure 1 shown that the blade 7 is arranged on the bead 5. The bead 5 is embossed along a contour of the blade 9, in particular along a contour of an edge region of the blade that is adjacent to the cover plate 3 or the base plate 2. It is also shown that the bead 5, in particular a bead outlet 6a of the bead 5, has a curvature-continuous transition into the base plate 2 and into the cover plate. A fastening 12 of the blade 7 is shown as an example formed by means of a welded connection, wherein the fastening 12 is shown arranged on the pressure side and suction side of the blade. As an example, in Figure 1 also shown that the blade 5 is arranged between a pair of beads (not designated), wherein the pair of beads comprises a first bead 13 and a second bead 14, wherein the first bead 13 is formed on the cover disk 3 and the second bead 14 on the base disk 2. In this way, a stiffening of the impeller can advantageously be achieved and the lever ratios and stresses in the entire impeller can be optimized.

In particular, forces which are introduced into the cover and/or base disk during operation by means of the blades can be advantageously reduced.

Furthermore, in Figure 1 It is shown that the fastening 12 is designed in several parts, with a first part of the fastening 16 of the blade 7 being designed between the blade 7 and the cover plate 3 and at least a second part of the fastening 17 being designed between the blade 7 and the bead 5. The stability of the blade 7 on the cover plate 3 can thus advantageously be improved.

In Figure 2 is another perspective view of a wheel, analogous to Figure 1 , shown. A height 10 of the bead 5 varies in the radial direction of the impeller and increases towards the outside. Analogous to the Figures 1 and 2 is in Figure 3 shown how the height 10 of the bead 5 decreases towards the outside. The height of the bead 5 corresponds to a tenth, preferably an eighth, preferably a sixth part of the distance 4 between the base plate 2 and the cover plate 3. In this way, higher speeds and higher rotational speeds can be advantageously achieved with the same conveying capacity.

In Figure 4 is shown, analogous to the other figures, a top view of a base plate 2 with beads 5. A width 11 of the bead 5 varies in the radial direction of the impeller and decreases towards the outside. It is also shown that the bead 5 has a pressure-side profile, in particular a pressure-side contour profile, which deviates from a suction-side profile of the bead 5, in particular a suction-side contour profile of the bead 5. In a joint view with the other figures, it is also shown that the bead 5 is parallel or profiled to the one in the Figures 1 to 3 illustrated blade 7 is formed.

In the Figures 5 and 6 In conjunction with the other figures, an axial top view of a base plate 2 with blades 7 arranged thereon by means of fastenings 12 is shown. The width 11 of the bead 5 takes up Figure 5 to the radially outer edge of the base plate 2, thus to the radially outer edge of the, for example, Figure 1 shown impeller 1. In contrast to this, in Figure 6 the embodiment analogous to Figure 5 in which the width 11 of the beads 5 decreases towards the edge, ie increases in the radial direction outwards. The advantages mentioned also apply here.

List of reference symbols:

1

wheel

2

bottom plate

3

cover plate

4

distance between bottom plate and cover plate

5

beads

6

bead surface

6a

bead outlet

7

shovel

8

blade surface

9

blade contour

10

height of the bead

11

width of the bead

12

attachment of the shovel

13

first bead

14

second bead

15

axial direction of the impeller

16

first part of the fortification

17

second part of the fortification

Claims (14)

Impeller (1) of a radial fan for conveying a gaseous fluid, the impeller (1) comprising a base plate (2), a cover plate (3), wherein the cover plate (3) is arranged at a distance from the base plate (2) in the axial direction (15) of the impeller (1), wherein the cover plate (3) and/or the base plate (2) have at least one embossed bead (5), in particular a plurality of embossed beads (5), a plurality of blades (7),
wherein at least one blade (7) is arranged between the cover plate (3) and the base plate (2) and is fastened in the region and in the course of at least one bead (5), characterized in that a surface profile of the bead (5) follows a surface profile of the blade (7) attached to the bead (5), at least in an envelope, such that a conveying effect of the bead (5) corresponds at least to a conveying effect of a blade surface (8) reduced due to the bead (5). Impeller (1) according to claim 1, characterized in that the blade (7) is arranged on the bead (5), in particular on the bead (5), preferably in the bead (5). Impeller (1) according to one of the preceding claims, characterized in that the bead (5) extends along a contour of the blade (9), in particular along a contour of a cover disk (3) or the edge area of the blade (7) adjacent to the base disk (2). Impeller (1) according to one of the preceding claims, characterized in that a height (10) of the bead (5) varies and in particular increases in the radial direction of the impeller (1). Impeller (1) according to one of the preceding claims, characterized in that the height (10) of the bead (5) corresponds to a tenth part, in particular a fifteenth part, in particular a twentieth part, preferably at most a fiftieth part, of a distance (4) between the base plate (2) and the cover plate (3). Impeller (1) according to one of the preceding claims, characterized in that a width (11) of the bead (5) varies and in particular increases in the radial direction of the impeller (1). Impeller (1) according to one of the preceding claims, characterized in that the bead (5) is interrupted in the radial direction of the impeller (1), in particular is only partially formed. Impeller (1) according to one of the preceding claims, characterized in that the bead (5), in particular a flank of the bead (5), is formed parallel or profiled to the blade (7), preferably to a contour of the blade (7). Impeller (1) according to one of the preceding claims, characterized in that the bead (5) has a pressure-side profile, in particular a pressure-side contour profile, which deviates from a suction-side course of the bead (5), in particular the suction-side contour course of the bead (5). Impeller (1) according to one of the preceding claims, characterized in that the bead (5), in particular a bead outlet (6a) of the bead (5), has a, preferably partially, continuous curvature transition into the base plate (2) and/or into the cover plate (3). Impeller (1) according to one of the preceding claims, characterized in that a fastening (12) of the blade (7) is formed by means of a welded and/or a lashed and/or screwed and/or riveted and/or glued and/or caulked connection, wherein the fastening (12) is arranged in particular on the pressure side and/or suction side of the blade (7). Impeller (1) according to claim 11, characterized in that the fastening (12) is designed in several parts, wherein either at least a first part (16) of the fastening (12) is formed between the blade (7) and the base plate (2) and at least a second part (17) of the fastening (12) is formed between the blade (7) and the bead (5), or wherein at least a first part (16) of the fastening (12) is formed between the blade (7) and the cover plate (3) and at least a second part (17) of the fastening (12) is formed between the blade (7) and the bead (5). Impeller (1) according to one of the preceding claims, characterized in that the blade (7) is arranged between a pair of beads,
wherein the pair of beads comprises a first bead (13) and a second bead (14),
wherein the first bead (13) is formed on the cover plate (3) and the second bead (14) is formed on the base plate (2),
wherein in particular the first bead (13) and/or the second bead (14) is/are designed according to one of the preceding claims. Radial fan comprising a housing, a motor, in particular a control unit, and an impeller (1) for conveying a gaseous fluid, characterized in that the impeller (1) is designed according to one of the preceding claims.

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