ARRANGEMENT OF AN IMPELLER ON A ROTATING PART AND METHOD FOR PRODUCING THE ARRANGEMENT

Abstract

An arrangement of an impeller (3) on a rotating part, preferably on an electric motor (1), in particular on an external rotor motor, wherein the torque of the motor (1) is transmitted to the impeller (3) by a rotationally secure connection between the rotor (2) of the motor (1) and the impeller (3) or its impeller hub (4), and wherein the connection is created by means of a press fit between the impeller hub (4) and the rotor (2), with integration of a sleeve (6) which is preferably securely assigned to the impeller hub (4) and which takes up mechanical stresses, is characterized in that the sleeve (6) is polygonal and is pressed onto the surface of the rotor (2), with at least minor deformation, forming axial contact surfaces. Also specified is a method for producing such an arrangement.

Claims

1. An impeller assembly on a rotating part, preferably on an electric motor (1), in particular on an external rotor motor, wherein the torque of the motor (1) is transferred to the impeller (3) by a non-rotating connection between the rotor (2) of the motor (1) and the impeller (3), or its impeller hub (4), and wherein the connection is implemented via a press fit between the impeller hub (4) and the rotor (2), incorporating a round blank (6), preferably permanently dedicated to the impeller hub (4), that absorbs mechanical tensions, characterized in that the round blank (6) is polygonal, and is pressed onto the rotor (2) such that it forms at least slightly deformed axial surface contacts with the surface of the rotor (4).

2. The assembly according to claim 1, characterized in that the round blank (6) is generated in situ during the production of the impeller (3) or the impeller hub (4).

3. The assembly according to claim 1, characterized in that the round blank (6) is a metal round blank, in particular made of sheet metal, preferably steel sheet metal.

4. The assembly according to one of the claims 1 to 3, characterized in that the round blank (6) is octagonal.

5. The assembly according to one of the claims 1 to 4, characterized in that the sheet metal round blank is molded on the inside of the hub (4), in its passage, into the material of the hub (4), or is at least partially coated.

6. The assembly according to one of the claims 1 to 5, characterized in that the inner diameter of the round blank (inscribed circle) (6) is smaller than the outer diameter of the rotor (2).

7. The assembly according to claim 6, characterized in that the inner diameter of the round blank (6) is selected such that when the round blank (6) is slid on, an initial axial linear contact is expanded to form an axial surface segment.

8. The assembly according to claim 6 or 7, characterized in that the inner diameter of the round blank (6) is selected such that after the round blank (6) has been pressed on and deformed, regions remain that are not in contact with the surface of the rotor (2).

9. The assembly according to one of the claims 1 to 8, characterized in that the round blank (6) has a zonal or segmented, or circumferential flaring in the edge region (7), in order to facilitate the sliding and pressing onto the rotor (2).

10. A method for the production of an assembly according to one of the claims 1 to 9, characterized by the following steps: provision of a motor (1), in particular an external rotor motor, preferably retained vertically by a workpiece mount; provision of an impeller (3) having a polygonal round blank (6), integrated in the passage of the impeller (3); positioning of the impeller (3) in accordance with the desired conveyance direction with respect to the motor (1); sliding of the impeller (3) onto the rotor (2) while deforming the round blank (6) such that axial, segmented surface contacts are formed in relation to the surface of the rotor (2), with open passage areas lying between them.

11. The method according to claim 10, characterized in that during the production of the impeller (3), a round blank (6) is selected with an inner diameter, having a size such that when the round blank (6) is pressed on, an initial axial linear contact expands to form an axial surface contact, such that after the round blank (6) has been pressed on and deformed, regions remain between the contact surfaces that are not in contact with the surface of the rotor (2).

Description

[0029] There are now various possibilities to advantageously embody and develop the teachings of the present invention. For this, reference is made, on one hand, to the Claims subordinate to Claim 1, and on the other hand, to the following explanation of a preferred exemplary embodiment of the invention based on the drawings. In conjunction with the explanation of the preferred exemplary embodiment of the invention based on the drawings, preferred designs and developments of the teachings are explained in general. Therein:

[0030] FIG. 1 shows a schematic view of an exemplary embodiment of an assembly according to the invention, in concrete terms, an axial ventilator, in the assembled state,

[0031] FIG. 2 shows the subject matter of FIG. 1 in a schematic front view,

[0032] FIG. 3 shows the subject matter of FIGS. 1 and 2, in a partial cutaway, in a schematic side view,

[0033] FIG. 4 shows, in a schematic view like that in FIG. 1, the impeller of the subject matter of FIGS. 1 to 3, without a rotor,

[0034] FIG. 5 shows the impeller from FIG. 4, in a view like that in FIG. 3, but without a rotor, and

[0035] FIG. 6 shows a schematic view of an exemplary embodiment of a sheet metal round blank, corresponding to the design used in the impeller according to FIGS. 1 to 5.

[0036] FIG. 1 shows an assembly according to the invention in a schematic view, comprising an electric motor 1 with a rotor 2, wherein an impeller, hereinafter referred to as a fan wheel 3, is pressed onto the rotor 2. A non-rotating connection between the hub 4 of the fan wheel 3 and the rotor 2, or its surface, is produced by a press fit.

[0037] The blades 5 are provided with aerodynamic features, which do not play a role with respect to the teachings according to the invention.

[0038] It should be noted at this point that the fan wheel 3 is pressed onto the rotor 2 in order to generate a concrete flow direction. For the reverse flow direction it is possible to press the fan wheel 3 onto the rotor facing in the other direction, without changing the type and design of the fan wheel 3.

[0039] FIG. 2 shows the subject matter in FIG. 1 in a top view, wherein the polygonal round blank 6 can be seen in a schematic view, between the hub 4 of the fan wheel 3 and the rotor 2, the surfaces of which are in contact with the surface of the rotor 2, which can be referred to as a widened linear contact. Ultimately, this concerns axially extending segmented contact surfaces, which are more or less pronounced, depending on the deformation of the round blank 6.

[0040] FIG. 3 shows the subject matter in FIGS. 1 and 2 in a schematic side view, with a partial cutaway. FIG. 3 clearly shows that the round blank 6 is designed as a sheet metal round blank in the exemplary embodiment selected herein, which is integrated into the material of the hub 4 of the fan wheel 3. The round blank 6 is coated with the same material as the fan wheel, e.g. plastic.

[0041] FIG. 3 also indicates that the round blank 6 has a flared region 7 on one side. Regardless thereof, the fan wheel 3 having the round blank 6 molded therein, is designed such that the fan wheel 3 can be pressed automatically onto the rotor 2 for both conveyance directions. A single fan wheel is to be provided for both conveyance directions, resulting in a significant reduction in storage costs. This results in a maximum of flexibility.

[0042] FIG. 4 shows the fan wheel 3 of the assembly from FIGS. 1 to 3, without a rotor. The hub 4 of the fan wheel 3 is provided in the interior with the round blank 6, having an octagonal design. When it has not been slid on, i.e. according to the depiction from FIG. 4, the planar surfaces 9 extending between the corners 8 of the round blank 6 have a common smallest radius, formed by the respective central contact points of these surfaces 9 with an inscribed circle. This radius must be smaller than the outer diameter of the rotor 2 with respect to the surface of the rotor 2, in order to enable a pressing of the hub 4 with the integrated round blank 6 onto the rotor, while deforming the round blank 6, more precisely, while deforming the originally planar surfaces 9 extending between the corners 8.

[0043] It should be noted with regard to the round blank 6, that it can exhibit arbitrary measures, such as embossing or beading, etc. in order to improve the stability/rigidity, without abandoning the teachings of the invention thereby.

[0044] FIG. 5 shows the subject matter in FIG. 4, in an illustration corresponding to FIG. 3, but without a motor 1/rotor 2. Here as well, the integrated round blank 6 can be discerned with its corners 8 and surfaces 9.

[0045] Lastly, FIG. 6 shows the round blank 6 alone, as an octagon in this exemplary embodiment, with surfaces 9 lying therebetween, which serve as bearing surfaces on the rotor 2, and become deformed when the hub 4 or the fan wheel 3 is pressed onto the rotor 2, resulting in the mechanical purchase when subjected to a corresponding tension.

[0046] FIG. 6 also shows a circumferential flared region 7, which facilitates the sliding and pressing thereof onto the rotor 2 in one direction. Discrete flarings 7 are provided on the opposite side of the round blank 6 in a segmented design, which facilitate the sliding or pressing on, facing in the other direction. Each of the two edge regions can have either a circumferential flaring 7, or individual discrete flarings 7.

[0047] Regarding further advantageous embodiments of the teachings according to the invention, reference is made to the general description and to the attached Claims, in order to avoid repetition.

[0048] Lastly, it is expressly stated that the exemplary embodiment described above serves only as a means for explaining the claimed teachings, while these teachings are not limited to the exemplary embodiment.

LIST OF REFERENCE SYMBOLS

[0049] 1 electric motor [0050] 2 rotor [0051] 3 impeller, fan wheel [0052] 4 hub, impeller hub [0053] 5 blade [0054] 6 round blank [0055] 7 expanded edge region (edge region of the round blank), flaring [0056] 8 corner of the round blank [0057] 9 planar surface of the round blank