Impeller for radial fan

Abstract

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

Description

[0001] The present invention relates to the technical field of impellers for radial fans for conveying a gaseous fluid.

[0002] Impellers for radial fans are already known to those skilled in the art.

[0003] Document EP 2 846 046 A1, for example, discloses a fan wheel for conveying a gaseous fluid, comprising a plurality of blades arranged at a constant angular pitch in an annular volume around a rotation axis, and each of which is secured by its axially opposite end regions to a support means. Characteristic of this is that at least one blade has a peripheral edge region, in particular a frame-shaped peripheral region, and at least one inner region surrounded by the peripheral edge region, wherein at least one bead is formed between the peripheral edge region and the inner region along an at least L-shaped, preferably U-shaped, in particular peripheral curve, and / or wherein the peripheral edge region is defined by a first blade surface and the inner region is defined by a second blade surface, which is arranged and / or configured geometrically differently from the first blade surface.

[0004] Furthermore, impellers of radial fans are known, which comprise flat base discs and cover discs on which blades are attached.

[0005] 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 influences the speed stability.

[0006] 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.

[0007] 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.

[0008] The invention provides that the proposed configurations can apply to all components of the impeller, for example, one made of metal, but also to individual components of the impeller. For the purposes of the invention, the components of an impeller are understood to mean the cover plate, base plate, and blades. Furthermore, the invention provides that the proposed configurations can apply to all blades of an impeller, but also to individual blades of an impeller. In other words, a configuration of only one of the aforementioned components may be advantageous, but a configuration of all components achieves the greatest benefits.

[0009] 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.

[0010] 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.

[0011] 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 beads, 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 profile of the bead follows a surface profile 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.

[0012] 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.

[0013] This can advantageously make it possible to shorten the blade and, at the same time, to 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, whereby leverage ratios occurring during impeller operation can be improved and the transition between the blade and the cover and / or base plate can be softened. The stresses occurring throughout the impeller during impeller operation can thus be reduced. In particular, stresses introduced by the blades into the cover and / or base plate can be advantageously reduced. The strength of the impeller can thus be increased and higher rotational speeds, or higher peripheral speeds, can therefore be achieved.

[0014] In addition, costs can be reduced and greater flexibility in the design of a wheel can be enabled.

[0015] 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.

[0016] This can further increase the flexibility in the production of a wheel.

[0017] 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.

[0018] This can also advantageously improve the stability and strength of the wheel.

[0019] 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.

[0020] This allows special requirements for the use of the impeller to be taken into account and the production to be adapted accordingly in order to further increase the strength of the impeller.

[0021] 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.

[0022] This can also further increase the possibilities for manufacturing, taking into account given application requirements.

[0023] 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.

[0024] This can also further increase the stability and strength of the impeller and offer flexible manufacturing options for given requirements when using the impeller.

[0025] 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.

[0026] This can offer additional advantageous possibilities for the production and use of the impeller.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] This can also advantageously enable more flexible manufacturing to improve the stability and strength of the impeller.

[0031] 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.

[0032] In areas subject to heavy loads, this can be beneficial for providing additional stability.

[0033] 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.

[0034] In this way, the advantages already mentioned can be combined with the advantages of low-cost production or production adapted to given requirements.

[0035] 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.

[0036] Advantageously, the blade can be attached to the base plate or the cover plate or the bead with particular stability and greater flexibility in production can thus be achieved.

[0037] 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 formed on the cover plate and the second bead on the base plate, wherein in particular the first and / or the second bead are formed according to one of the preceding claims.

[0038] 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 unit, and an impeller for conveying a gaseous fluid, characterized in that the impeller is designed according to one of the preceding claims.

[0039] This can also further improve flexibility in production and increase strength.

[0040] Embodiments of the invention are illustrated schematically in the figures and are described in more detail below.

[0041] They show: Figure 1 shows a perspective view of an impeller; Figure 2 shows a further perspective view of the impeller; Figure 3 shows a further perspective view of the impeller; Figure 4 shows a top view of a base disc; Figure 5 shows a top view of a base disc with blades; and Figure 6 shows a top view of a base disc with blades.

[0042] In Figure 1is 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 plate 3 and the base plate 2 and is fastened in the region of and in the course of at least one bead 5, wherein a surface profile of the bead 5 follows a surface profile of the blade 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.The blade 7 can thereby be advantageously shortened and at the same time a stiffening of the base plate 2 and / or the cover plate 3 can be achieved.

[0043] Furthermore, 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 rests against 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 continuous curvature transition into the base plate 2 and the cover plate. A fastening 12 of the blade 7 is shown as being formed by means of a welded connection, wherein the fastening 12 is shown arranged on the pressure side and the suction side of the blade. As an example, in Figure 1It is also shown that the blade 5 is arranged between a pair of beads (not labeled), 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. In this way, a stiffening of the impeller can be advantageously achieved and the leverage ratios and stresses in the entire impeller can be optimized.

[0044] In particular, forces introduced into the cover and / or base disk by means of the blades during operation can be advantageously reduced.

[0045] Furthermore, Figure 1It is shown that the fastening 12 is formed in several parts, with a first part of the fastening 16 of the blade 7 being formed between the blade 7 and the cover plate 3, and at least a second part of the fastening 17 being formed between the blade 7 and the bead 5. This advantageously improves the stability of the blade 7 on the cover plate 3.

[0046] In Figure 2 is another perspective view of a wheel, analogous to Figure 1 , shown. The 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 3It is shown how the height 10 of the bead 5 decreases outwards. The height of the bead 5 corresponds to a tenth, preferably an eighth, preferably a sixth of the distance 4 between the base plate 2 and the cover plate 3. Thus, higher speeds and higher rotational speeds can be advantageously achieved with the same conveying capacity.

[0047] In Figure 4 Analogous to the other figures, a plan view of a base plate 2 with beads 5 is shown. A width 11 of the bead 5 varies in the radial direction of the impeller and decreases towards the outside. Furthermore, it is 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. Also shown in conjunction with the other figures is that the bead 5 is parallel or profiled to the Figures 1 to 3illustrated blade 7.

[0048] In the Figures 5 and 6 In conjunction with the other figures, an axial plan 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, in Figure 6 the embodiment analogous to Figure 5 , in which the width 11 of the beads 5 decreases toward the edge, ie, increases radially outward. The aforementioned advantages also apply here. List of reference symbols:

[0049] 1Impeller 2Bottom disc 3Shroud 4Distance between bottom disc and shroud 5Corrugations 6Corrugation surface 6aCorrugation outlet 7Blade 8Blade surface 9Blade contour 10Height of the corrugation 11Width of the corrugation 12Fastening of the blade 13First corrugation 14Second corrugation 15Axial direction of the impeller 16First part of the fastening 17Second part of the fastening

Claims

1. 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 along 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).

2. 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).

3. Impeller (1) according to one of the preceding claims, characterized in that the bead (5) is embossed along a contour of the blade (9), in particular along a contour of an edge region of the blade (7) adjacent to the cover plate (3) or the base plate (2).

4. Impeller (1) according to one of the preceding claims, characterized in that a height (10) of the bead (5) varies in the radial direction of the impeller (1) and in particular increases.

5. 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).

6. Impeller (1) according to one of the preceding claims, characterized in thata width (11) of the bead (5) varies and in particular increases in the radial direction of the impeller (1).

7. 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.

8. 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).

9. 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 profile of the bead (5), in particular a suction-side contour profile of the bead (5).

10. Impeller (1) according to one of the preceding claims, characterized in thatthe 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).

11. 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).

12. Impeller (1) according to claim 11, characterized in thatthe fastening (12) is designed in several parts, wherein either at least a first part (16) of the fastening (12) is designed between the blade (7) and the base plate (2) and at least a second part (17) of the fastening (12) is designed between the blade (7) and the bead (5), or wherein at least a first part (16) of the fastening (12) is designed between the blade (7) and the cover plate (3) and at least a second part (17) of the fastening (12) is designed between the blade (7) and the bead (5).

13. 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 formed according to one of the preceding claims.

14. 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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