EP3234369B1 - Axial ventilator - Google Patents

Description

The invention relates to an axial fan with an external or internal rotor motor comprising a rotor, with at least two blades being positively and non-positively connected to the rotor with connection areas at the ends, and the connection being made by clamping the connection areas using a clamping ring, the clamping ring corresponding to the number of Wing has recesses which, together with a respective holding piece, form receptacles for the connection area of the wings, with the holding piece being supported against the rotor and the clamping ring including the connection area of the wings with the rotor, preferably with a flange or a hub formed on the rotor, etc., is connected.

Basically, this is about fans that are driven by an external rotor motor or an internal rotor motor. Depending on the specific configuration, the vanes on the outer surface of the rotor are firmly connected to the rotor or to the hub of the inner rotor on the front side. In the prior art, the vanes are usually connected via two clamping ring halves or via a clamping ring and a counterpart firmly connected to the rotor in order to connect the individual vanes to the rotor in a positive and non-positive manner. With a variation in the number of wings, for example three wings, five wings or seven wings, you always need different clamping ring halves or different clamping rings together with a counterpart on the rotor. Due to the very different parts, this is complex to manufacture and store. The prior art is merely an example EP 0 769 095 B1 , EP 0 121 061 B1 and EP 1 783 375 A1 referred.

In any case, it is disadvantageous in the prior art that, depending on the number of wings, a specific connection technology is required, as a result of which the known connection concept has no flexibility. On the contrary, it is necessary to provide different components for connecting the blades for fans with different numbers of blades, right down to the specific fixation on the rotor.

Out of US 5,520,515A an axial fan with an external rotor motor comprising a rotor is known. There are three wings with end-side connection areas positively and non-positively connected to the rotor, the connection being made by clamping the connection areas using a clamping ring. Corresponding to the number of wings, namely three, the clamping ring has recesses which, together with a respective holding piece, form receptacles for the connection region of the wings. The holding piece is supported against the rotor. The clamping ring is connected to the rotor including the connection area of the vanes. The holding piece is positively received in a recess of the rotor. On the side facing the connection area of the wing, the holding piece has a notch in the sense of a keyway. The notch of the holding piece is designed to positively accommodate a molding of the connection area in the sense of a feather key.

A disadvantage of the known axial fan is that the assembly of the axial fan is complicated and expensive due to the arrangement of the holding piece in the recess of the rotor. For example, care must always be taken to ensure that the vanes are correctly positioned or oriented in relation to the rotor. Secure positioning or orientation of the vanes relative to the rotor is only ensured when the clamping ring is screwed to the rotor.

Out of ES-A-2375003 an axial fan with an external or internal rotor motor comprising a rotor is known, with at least two blades being connected to the rotor in a positive and non-positive manner with end connection areas, with the connection of the connection areas taking place by means of a clamping ring, the clamping ring having recesses corresponding to the number of blades , which together with a holding piece each form receptacles for the connection area of the wings, with the holding piece being supported against the rotor and the clamping ring, including the connection area of the wings, being connected to the rotor, preferably to a flange formed on the rotor, or to a hub and wherein the holding piece is at least slightly inserted into the recess of the clamping ring and, together with the recess or the clamping ring, the receptacle for the connection area of the form wings. It is not explicitly stated what type of engine it is.

US-A-3294175 also shows a generic fan with the features discussed above.

The present invention is now based on the object of specifying a flexible connection concept for blades of axial fans, according to which only a few different connection components are required for a different number of blades. The connection concept according to the invention should have maximum flexibility during assembly and in relation to the parts to be manufactured and stored. Furthermore, the assembly of the axial fans should be as simple as possible

The above object is achieved by the features of patent claim 1. According to this, the generic axial fan is characterized in that the receptacle has at least one opening in the area of the holding piece and/or in the area of the recess of the clamping ring, into which a positioning lug of an exchangeable and/or reversible indexing piece assigned non-rotatably to the connection area of the blade fits and thereby defines the wing angle.

According to the invention, it has been recognized that the underlying object can be achieved by at least slightly inserting the holding piece into the recess of the clamping ring. In this way, a provisional or provisional fixation of the respective wing on the clamping ring can namely be produced. By at least slightly inserting the holding piece into the recess of the clamping ring, pre-assembly of the wing on the clamping ring is possible. The holding piece and the recess of the clamping ring thus together form the receptacle for the connection area of the wing. By arranging the locating lug of an indexer to fit into an opening of the socket, the vane angle can be defined. A single indexing piece is sufficient to specify two conveying directions and two vane angles. In this way, enormous flexibility is achieved.

The flexibility of the connection concept according to the invention results from the interaction of a clamping ring with a holding piece for each recess, so that recordings for the connection area of the wings are created according to the number of recesses, including the holding piece. Other specific components, with the exception of the clamping ring, are not required.

The shape or contour of the holding piece is designed in such a way that it is ideally supported against the rotor or against a component of the rotor. The clamping ring is connected to the rotor, including the connection area of the respective wing, in such a way that the connection area of the respective wing is clamped within the receptacle. The clamping ring is preferably connected to a flange formed on the rotor, a hub, etc., depending on whether the drive is an external rotor motor or an internal rotor motor. Irrespective of the specific configuration, it is essential that the clamping ring together with the holding piece form a receptacle for the connection area of the wing and brace the connection area within the receptacle by the clamping ring being firmly screwed to the rotor. A secure connection is thus created.

At this point it should be noted once again that the flexibility of the connection concept according to the invention relates to the fact that only a single specific component is required, namely a clamping ring designed for the number of wings. Irrespective of the number of wings, each recess of the clamping ring interacts with a uniform holding piece, so that this holding piece, in a single embodiment, is easy to store.

The holding piece and the respective recess in the clamping ring can be matched to one another in such a way that the holding piece is at least slightly inserted into the recess of the clamping ring, as a result of which the wings can be pre-assembled on the clamping ring. The holding piece and the recess of the clamping ring together form the receptacle for the connection area of the wing, with this receptacle being able to be designed to be essentially rotationally symmetrical in accordance with the design of the connection area of the wing.

For greater flexibility, the receptacle has at least one opening in the area of the holding piece and/or in the area of the recess of the clamping ring, into which a positioning lug of an exchangeable and/or reversible or foldable indexing piece that is non-rotatably assigned to the connection area of the wing fits. The wing angle can also be defined by this measure, namely according to the configuration or arrangement of the positioning nose on the indexing piece.

Although the use of a special indexing piece has the disadvantage of an additional component, it brings enormous advantages in terms of flexibility, especially since the indexing piece makes it possible to define both the wing angle and the conveying direction, namely due to the forced position of the wing given by the indexing piece within the recording.

The indexing piece is preferably a component that can be attached to the lower end of the connection area of the wing or inserted there and possibly latched, so that the indexing piece implements a type of coding of the wing in relation to its position within the receptacle . In any case, the indexing piece complements the connection area of the wing and thereby creates a constrained positioning of the connection area within the socket and thus of the wing as a whole.

It is of further advantage if the indexing piece has a specific color corresponding to the wing angle defined by the positioning lug, which can be recognized from the outside, or rather from the front, through a passage formed in the clamping ring. This measure makes it possible to determine at any time the blade angle at which the fan is running. This measure can also be used to check whether all the fan blades are installed with the same blade angle.

As already mentioned, it is possible with the help of the indexing piece to define the wing angle or even later, namely by replacing the Indexing pieces to change the wing angle. Depending on the equipment and the specific installation of the indexing piece, this not only specifies the vane angle, but also the conveying direction. Consequently, a single indexing piece is suitable for specifying, on the envelope, two conveying directions and two vane angles. Here, too, the focus is on maximum flexibility.

According to the variant of the drive - external rotor or internal rotor - the clamping ring is connected to the rotor, in particular with a flange on the external rotor or with a hub in the front area of the internal rotor. Any other attachment options are conceivable and covered by the teaching according to the invention.

According to the provisions on the rotor, the clamping ring can be screwed to the rotor either from the clamping ring side, i.e. from the front, or from the flange side, i.e. from the rear. When screwing from the front, it is advisable to screw the clamping ring to the rotor through the corresponding screw holes in the clamping ring, using standard screws. Alternatively, it is conceivable to screw the clamping ring from the flange side, i.e. from behind, whereby it is possible to screw the rear side by means of a direct plastic screw connection.

With regard to the materials used, it is advantageous to coordinate them with one another. The wing, the clamping ring, the holding element and, if applicable, the indexing piece can be made of plastic by plastic injection molding or of aluminum by aluminum die casting. It is also conceivable that parts subject to wear or unwanted deformation are made from a harder material, i.e. from a harder plastic or a harder aluminum alloy.

Fig. 1, 2 und 3

in einer schematischen Ansicht Ausführungsbeispiele eines Axialventilators mit Außenläufermotor mit drei, fünf und sieben Flügeln,

Fig. 4

den Gegenstand aus Fig. 3 in Explosionsdarstellung mit den wesentlichen Bestandteilen der Erfindung,

Fig. 5, 6, und 7

in einer schematischen Ansicht Ausführungsbeispiele eines Axialventilators mit drei, fünf und sieben Flügeln mit Innenläufermotor,

Fig. 8

den Gegenstand aus Fig. 7 in Explosionsdarstellung mit den wesentlichen Bestandteilen der Erfindung,

Fig. 9

in einer schematischen Ansicht einen Spannring zur Anbindung von drei Flügeln von vorne,

Fig. 10

in einer schematischen Ansicht den Gegenstand aus Fig. 9 von hinten,

Fig. 11

in einer schematischen Ansicht einen Spannring zur Anbindung von fünf Flügeln von vorne,

Fig. 12

in einer schematischen Ansicht den Gegenstand aus Fig. 11 von hinten,

Fig. 13

in einer schematischen Ansicht einen Spannring zur Anbindung von sieben Flügeln von vorne,

Fig. 14

in einer schematischen Ansicht den Gegenstand aus Fig. 13 von hinten,

Fig. 15

in einer schematischen Ansicht ein Ausführungsbeispiel eines Haltestücks,

Fig. 16

in einer geschnittenen und vergrößerten Ansicht, einen Schnitt durch den Spannring und den Flügel inklusive Darstellungen von Halteelement und eingesetztem Indexierstück,

Fig. 17

in einer geschnittenen und vergrößerten Ansicht eine nicht zur Erfindung gehörende alternative Ausgestaltung der Anordnung nach Fig. 16, wobei das Halteelement mit einer Positioniernase die Aufgabe des Indexierstücks nach Fig. 16 übernimmt,

Fig. 18

in einer schematischen Ansicht die Winkelvariation mittels Indexierstück, Winkel +4°, in der einen Förderrichtung,

Fig. 19

in einer schematischen Ansicht die Winkelvariation mittels Indexierstück, Winkel -4°, in der einen Förderrichtung,

Fig. 20

in einer schematischen Ansicht die Winkelvariation mittels Indexierstück , Winkel +4°, in der anderen Förderrichtung,

Fig. 21

in einer schematischen Ansicht die Winkelvariation mittels Indexierstück , Winkel -4°, in der anderen Förderrichtung,

Fig. 22 und 23

in jeweils einer schematischen Ansicht ein Indexierstück für die Winkel +4°und -4° für beide Förderrichtungen und

Fig. 24

in einer schematischen Ansicht ein Ausführungsbeispiel eines erfindungsgemäßen Flügels mit fußseitigem Verbindungsbereich, der sich um ein Indexierstück entsprechend den Fig. 22 und 23 ergänzen lässt.

There are now various possibilities for embodying and developing the teaching of the present invention in an advantageous manner. For this purpose, on the one hand, reference is made to the claims subordinate to claim 1 and, on the other hand, to the following explanation of preferred exemplary embodiments of the invention with reference to the drawing. In connection with the explanation of the preferred embodiments of the invention based on the drawing, preferred configurations and developments of the teaching are also explained in general. In the drawing show in the

Figures 1, 2 and 3

in a schematic view, exemplary embodiments of an axial fan with an external rotor motor with three, five and seven blades,

4

the item 3 in an exploded view with the essential components of the invention,

Figures 5, 6, and 7

in a schematic view, exemplary embodiments of an axial fan with three, five and seven blades with an internal rotor motor,

8

the item 7 in an exploded view with the essential components of the invention,

9

in a schematic view a clamping ring for connecting three wings from the front,

10

the object in a schematic view 9 from behind,

11

in a schematic view a clamping ring for connecting five wings from the front,

12

the object in a schematic view 11 from behind,

13

in a schematic view of a clamping ring for connecting seven wings from the front,

14

the object in a schematic view 13 from behind,

15

in a schematic view an embodiment of a holding piece,

16

in a sectional and enlarged view, a section through the clamping ring and the wing including representations of the holding element and the indexing piece used,

17

in a sectional and enlarged view of an alternative embodiment of the arrangement that does not belong to the invention 16 , wherein the holding element with a positioning nose according to the task of the indexing piece 16 takes over,

18

in a schematic view the angle variation using an indexing piece, angle +4°, in one conveying direction,

19

in a schematic view the angle variation using an indexing piece, angle -4°, in one conveying direction,

20

in a schematic view the angle variation using an indexing piece, angle +4°, in the other conveying direction,

21

in a schematic view the angle variation using an indexing piece, angle -4°, in the other conveying direction,

22 and 23

in each case a schematic view of an indexing piece for the angles +4° and -4° for both conveying directions and

24

in a schematic view an embodiment of a wing according to the invention with a foot-side connection area, which is an indexing piece according to the 22 and 23 can be added.

The 1 , 2 and 3 show exemplary embodiments of an axial fan according to the invention with an external rotor motor. Correspondingly, the rotor 1 is arranged on the outside and the wings (three wings according to 1 , five wings according to 2 and seven wings according to 3 ) connected via a clamping ring 2 to a flange 3 of the rotor 1. The conveying direction and the wing angle are predetermined according to the orientation of the wing 4 or the indexing piece 12 .

The 1 , 2 and 3 show that according to the number of wings 4 different clamping rings 2 are used, which have recesses 5 corresponding to the number of wings 4, which are used to accommodate the connecting areas 6 of the wings 4.

The 1 , 2 and 3 can also be seen that in the clamping ring 2 passages 2a are provided in the sense of front screw holes, namely to accomplish the assembly and bracing "from the front".

4 shows essential parts of the item in an exploded view 3 , where only a wing 4 is shown there.

According to the illustration in 4 the rotor 1 is shown with the flange 3, which is used to screw the respective clamping ring 2. So that different clamping rings 2, corresponding to the number of wings 4, can be screwed to the flange 3, the latter is equipped with a hole pattern 2b, namely for screwing different clamping rings 2 through their passages 2a or screw holes. The hole pattern 2b is thus designed for screwing all possible clamping rings 2 according to the screw holes there.

The clamping ring 2 is equipped with a total of seven recesses 5 which each interact with an identical holding piece 7 . The connection area 6 of the wing 4 is enclosed in the recess 5 by the material of the clamping ring 2 and the holding piece 7, is located in a more or less closed position due to the interaction of the clamping ring 2 and the holding piece 7 Recording 8 (see 16 , 17 ), The entire arrangement, ie in the inserted state of the wing 4, is screwed via the clamping ring 2 to the flange 3 of the rotor 1 and is braced in the process. A positive and non-positive connection is created.

The figure 5 , 6 and 7 show further exemplary embodiments of axial fans according to the invention 1 , 2 and 3 , but with internal rotor motor. The rotor 1 runs inside and the clamping ring 2 is connected to the hub 9 of the rotor 1. The wings 4 are according to the statements on the Figures 1 to 3 fixed. In this respect, the same explanations as for the variants with an external rotor motor also apply here.

8 shows the item 7 in an exploded view, with the clamping ring 2 and its recesses 5 also interacting with identical holding pieces 7 here. The recess 5 together with the holding piece 7 forms a receptacle 8 for the connection area 6 of the wing 4. The clamping ring 2 is also screwed from the front through the passages 2a, with the clamping ring 2 being screwed to the hub 9 of the rotor 1.

According to the explanations 4 the hub 9 is equipped with a hole pattern 2b, which is designed in such a way that all the clamping rings 2 in question, corresponding to the passages 2a or screw holes there, can be screwed to the hub 9 of the rotor 1.

9 shows an embodiment of a clamping ring 2 for a total of three wings not shown there, wherein the recesses 5 for receiving each of the wings can be seen.

10 shows the item 9 in a rear view, namely with a view into the recess 5.

The 11 and 12 13 and 14 show further exemplary embodiments of a clamping ring 2, namely for five and seven wings 4, each in a view from the front and from the rear. The respective recesses 5 are clearly visible.

15 shows an exemplary embodiment of a holding piece 7, as can be used in all variants of the clamping rings 2 shown above to form the receptacle. The holding piece 7 has an opening 10 on the inside for inserting a 15 not shown positioning nose of an Indexierstück equipped, which is used to define the wing angle.

In 15 is also indicated that the holding piece 7 is equipped on the outside with ribs 11, which are used for self-locking between the holding piece 7 and the clamping ring 2 in the inserted state. Alternatively, instead of the ribs 11, a type of snap/locking or similar connection could act between the holding piece 7 and the clamping ring 2 in order to ensure the "self-locking" mentioned above.

16 shows an enlarged view, partially in section, of an area of the clamping ring 2 and the wing 4 or the connecting area 6 of the wing 4, with an indexing piece 12 being inserted in the foot area of the wing 4. The indexing piece 12 is used to define the vane angle and the conveying direction. The positioning lug 13 of the indexing piece 12 that can be seen there engages in the opening 10 of the holding piece 7, as a result of which the angular position of the wing 4 is fixed. Alternatively, the positioning lug 13 could also engage in the passage 14 in the clamping ring 2 .

16 also shows a passage 14 provided in the clamping ring 2, through which the color of the indexing piece 12 can be seen from the outside. The color of the indexing piece 12 corresponds to the angular position specified by the indexing piece 12, for example +4° and -4°.

The 18 and 19 show the wing angle of a wing 4 with +4°( 18 ) and -4° ( 19 ), each in one conveying direction.

The 20 and 21 show the wing angle, also with +4° ( 20 ) and - 4°( 21 ), each in the other conveying direction, i.e. when the indexing piece 12 is arranged upside down.

The 22 and 23 show an embodiment of an indexing piece 12 with a molded positioning lug 13 and with a further locking lug 16.

Finally shows 24 an exemplary embodiment of a wing 4, which can be shaped in the most varied of ways in relation to an aerodynamic design. for the inside 24 It is essential in the exemplary embodiment shown that there is a connection area 6 on the foot side, which on the one hand has to accommodate an indexing piece for the purpose of setting the wing angle and on the other hand has a connection body 17 which is matched to the recess 5 in the clamping ring 2 and to the interior of the holding piece 7 , namely fits exactly into the receptacle 8 formed by the clamping ring 2 and the holding piece 7 .

With regard to further advantageous configurations of the fan according to the invention, to avoid repetition, reference is made to the general part of the description and to the appended claims.

Finally, it should be expressly pointed out that the above-described exemplary embodiments of the fan according to the invention only serve to explain the claimed teaching, but do not restrict it to the exemplary embodiments.

Reference List

1

rotor

2

clamping ring

2a

Passage in the clamping ring

2 B

Hole pattern in the flange/hub

3

flange (on rotor)

4

wing

5

recess (in the clamping ring)

6

Connection area (bottom side of leaf 4)

7

holding piece

8th

Recording (from clamping ring and holding piece)

9

hub (of the rotor)

10

Opening (in the receptacle 8 or in the holding piece)

11

rib

12

indexing piece

13

Positioning lug (of the indexing piece/the holding piece)

14

passage (in the clamping ring)

15

Recess (in the connection area 6 of the wing 4)

16

locking lug (on the indexing piece)

17

Connection body (foot side on the sash 4/in the connection area 6)

Claims (7)

1. Axial fan having an external or internal rotor motor which comprises a rotor (1), wherein at least two vanes (4) are connected with end connection regions (6) to the rotor (1) in a positive-locking and non-positive-locking manner and wherein the connection is carried out by clamping the connection regions (6) by means of the clamping ring (2), wherein

   the clamping ring (2) has corresponding to the number of vanes (4) recesses (5) which, together with a retention piece (7) form receiving members (8) for the connection region (6) of the vanes (4), wherein the retention piece (7) is supported against the rotor (1) and the clamping ring (2) including the connection region (6) of the vanes (4) is connected to the rotor (1), preferably to a flange (3) or a hub (9) which is formed on the rotor (1),

   characterised in that the receiving member (8) in the region of the retention piece (7) and/or in the region of the recess (5) of the clamping ring (2) has at least one opening (10) in which a positioning projection (13) of an indexing piece (12) which is associated with the connection region (6) of the vane (4) in a rotationally secure manner and which is replaceable and/or reversible fits and defines the vane angle.
2. Fan according to claim 1, characterised in that the retention pieces (7) are configured identically regardless of the number of vanes (4).
3. Fan according to claim 1 or 2, characterised in that the retention piece (7) is inserted at least slightly into the recess (5) of the clamping ring (2) and together with the recess (5) or the clamping ring (2) forms the receiving member (8) for the connection region (6) of the vane (4).
4. Fan according to any one of claims 1 to 3, characterised in that the indexing piece (12) in accordance with the vane angle defined by the positioning projection (13) has a specific colour which can be identified from the outer side by a passage (14) formed in the clamping ring (2).
5. Fan according to any one of claims 1 to 4, characterised in that the indexing piece (12) in accordance with the installation thereof defines both the conveying direction and the vane angle, that is to say, by reversal predetermines two conveying directions and two vane angles.
6. Fan according to any one of claims 1 to 5, characterised in that the clamping ring (2) is screwed to the rotor (1), in particular to a flange (3), a hub (9), etcetera, of the rotor (1), from the clamping ring side, that is to say, from the front, or from the flange side, that is to say, from the rear.
7. Fan according to any one of claims 1 to 6, characterised in that the vane (4), the clamping ring (2), the retention element and where applicable the indexing piece (12) are produced from plastics material by means of injection-moulding and/or from aluminium by means of die-casting.

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