Arrangement of an Impeller Wheel on an Electric Motor and Method for Producing the Same

Abstract

An arrangement of an impeller (1) on an electrical motor, in particular on an external rotor motor (8), whereby the torque of the motor is transferred to the impeller (1) by means of a torsion-proof connection between the rotor (8) of the motor and the impeller (1) and/or its impeller hub (3), is characterised in that the connection of the impeller (1) to the motor (8) results from physical and/or chemical interactions between an adhesive medium (10) and the contact surfaces (5) of the impeller hub (3) and of the motor (8), which face each other, whereby the adhesive medium (10) fills, at least partially, an intermediate space (9) that is formed between the impeller (1) and the motor (8) by the given play.

Claims

1. Arrangement of an impeller (1) on an electrical motor, in particular on an external rotor motor (8), whereby the torque of the motor is transferred to the impeller (1) by means of a torsion-proof connection between the rotor (8) of the motor and the impeller (1) and/or its impeller hub (3), characterised in that the connection of the impeller (1) to the motor (8) results from physical and/or chemical interactions between an adhesive medium (10) and the contact surfaces (5) of the impeller hub (3) and of the motor (8), which face each other, whereby the adhesive medium (10) fills, at least partially, an intermediate space (9) that is formed between the impeller (1) and the motor (8) by the given play.

2. The arrangement according to claim 1, characterised in that the intermediate space (9) formed between the impeller (1) and the motor (8) is a gap in the range of 0.05 mm to 3 mm, preferably in the range of 0.5 mm.

3. Arrangement according to claim 1 or 2, characterised in that a circumferential centring fin (6), which is interrupted by a longitudinal groove, is provided on the contact surface (5) of the impeller hub (3).

4. Arrangement according to claim 1 or 2, characterised in that at least 3, preferably 5, axial centring fins (6) are provided on the contact surface (5) of the impeller hub (3).

5. Arrangement according to claim 3 or 4, characterised in that the centring fins (6) define an imaginary internal surface with approximately the same diameter or a smaller diameter than the motor (8) such that they are deformed, at least to a small degree, when the impeller (1) is being pushed onto the motor (8).

6. Arrangement according to any one of the claims 1 to 5, characterised in that the impeller hub (3) has an internal cross-section that deviates from a circular ring-shaped internal cross-section, for example in the form of a polygon, etc., whereby the edges thus formed serve for centring on the motor (8) and the corners are filled, at least partially, with adhesive medium (10).

7. Arrangement according to any one of the claims 1 to 6, characterised in that at least one sealing surface (7), sealing lip or the like, preferably ring-shaped, is provided on the contact surface (5) of the impeller (1).

8. Arrangement according to any one of the claims 1 to 7, characterised in that the connection by means of the adhesive medium (10) is provided such as to exist over the entire contact surfaces (5) or in part and/or in zones of the intermediate space (9).

9. Arrangement according to any one of the claims 1 to 8, characterised in that the adhesive medium (10) is a glue that forms a connection to the contact surfaces (5) by means of adhesion and/or diffusion and/or chemical reaction.

10. Arrangement according to any one of the claims 1 to 9, characterised in that the contact surface of the motor (8) and/or the contact surface (5) of the impeller hub (3) is treated or coated with a material that promotes the adhesion to the adhesive medium (10) or is impacted, for example, by flame treatment.

11. Arrangement according to any one of the claims 1 to 10, characterised in that the contact surfaces (5) of the motor (8) and/or of the impeller hub (3) is/are roughened.

12. Arrangement according to any one of the claims 1 to 11, characterised in that the the contact surface (5) of the impeller hub (3) and/or of the motor (8) comprise at least one recess/notch, preferably in the form of a segmented or circumferential groove, that serve for accommodating and possibly dosing the adhesive medium (10) during the assembly.

13. Arrangement according to claim 12, characterised in that at least one feed channel for the adhesive medium (10) that exits into the recess or notch and/or in the intermediate space (9), preferably a feed channel that extends in axial direction, is provided.

14. Arrangement according to claim 12 or 13, characterised in that the recess/notch and/or the feed channel and/or the intermediate space (9) comprise(s) at least one ventilation or one aspiration channel, preferably in the form of a channel leading outwards.

15. Method for producing an arrangement of an impeller (1) on an electrical motor, in particular on an external rotor motor, whereby the torque of the motor is transferred to the impeller (1) by means of a torsion-proof connection between the rotor (8) of the motor and the impeller (1) and/or its impeller hub (3), in particular for producing an arrangement according to any one of the claims 1 to 14, characterised by the following procedural steps: providing a motor (8), in particular an external rotor motor, preferably one held vertically by a workpiece carrier; pushing an impeller (1) onto the motor (8) with at least a small level of play, preferably against a limit stop on the motor (8) that defines the position of the impeller hub (3); whereby the contact surface of the motor (8) and/or the contact surface (5) of the impeller (1) are possibly cleaned and coated, at least parts thereof, with a not-yet-cured adhesive medium (10) such that little or no adhesive medium (10) exits from the intermediate space (9) between the impeller (1) and the motor (8), when the impeller is being pushed on; possibly centring of the pushed-on impeller (1) on the motor (8), preferably by means of a ring-shaped transition fit that seals, between the impeller (1) and the motor (8), the intermediate space (9) between the contact surfaces (5) of the motor (8) and of the impeller hub (3) that is formed by the given play; possibly removing the transition fit before, during or after the curing of the adhesive medium (10); curing of the adhesive medium (10), possibly under the effect of temperature.

16. Method for producing an arrangement of an impeller (1) on a motor, in particular on an external rotor motor (8), whereby the torque of the motor is transferred to the impeller (1) by means of a torsion-proof connection between the rotor (8) of the motor and the impeller (1) and/or its impeller hub (3), in particular for producing an arrangement according to any one of the claims 1 to 14, characterised by the following procedural steps: providing a motor (8), in particular an external rotor motor, preferably one held vertically by a workpiece carrier; pushing an impeller (1) onto the motor (8) with at least a small level of play, preferably against a limit stop on the motor (8) that defines the position of the impeller hub (3), whereby the contact surfaces (5) of the impeller (1) and of the motor (8) preferably have been cleaned; possibly centring of the pushed-on impeller (1) on the motor (8), by means of a, preferably, ring-shaped transition fit that seals, between the impeller (1) and the motor (8), an intermediate space (9) between the contact surfaces (5) of the motor (8) and of the impeller hub (3) during the dosing of an adhesive medium (10); dosing of the adhesive medium (10) into the intermediate space (9), in particular by means of a feed channel through the impeller hub (3), preferably in an appropriate amount of such that no adhesive medium (10) exits from the intermediate space (9); possibly removing the transition fit before, during or after the curing of the adhesive medium (10); curing of the adhesive medium, possibly under the effect of temperature.

17. Method according to claim 16, characterised in that the adhesive medium (10) is being pressed and/or pushed and/or aspirated into the intermediate space (9).

Description

[0031] There are various ways of advantageous refinement and development of the teaching of the present invention. In this context, reference shall be made, on the one hand, to the sub-claims of patent claim 1 and, on the other hand, to the following illustration of an exemplary embodiment of the invention based on the drawing. Generally preferred refinements and developments of the teaching are also illustrated along with the explanation of the preferred exemplary embodiment of the invention based on the drawing. In the drawing,

[0032] FIG. 1 shows a schematic view of an impeller according to the prior art that is provided with an integral sheet metal circular blank for definition of the requisite material tension while the impeller is pressed on;

[0033] FIG. 2 shows a schematic view of, part of, an impeller as shown in FIG. 1, but according to the invention, i.e. without a sheet metal circular blank; and

[0034] FIG. 3 shows a schematic view of the arrangement of the impeller on an external rotor motor, whereby the intermediate space between the contact surfaces of impeller and external rotor motor is filled up with adhesive medium.

[0035] FIG. 1 shows a schematic view of the design of an impeller 1 known from the prior art, whereby this concerns a vane (axial impeller). The individual vanes 2 are integral component of a hub 3, whereby this altogether is an injection moulding part.

[0036] FIG. 1 clearly shows that the hub 3 is provided with a metal sheet circular blank 4 that imparts on the hub 3 sufficient strength for force-locked pushing [of the impeller] onto the external surface and/or contact surface of an external rotor motor that is not shown in FIG. 1. The metal sheet circular blank 4 is a separate component, which is produced in a progressive tool and is placed in the impeller tool before commencement of the injection moulding process of the impeller 1. The metal sheet circular blank 4 produces the requisite tension and a torsion-proof connection between the pressed-on impeller and the external rotor (8) of the external rotor motor.

[0037] FIG. 2 shows the impeller 1 of an arrangement according to the invention in detail. It differs from the depiction according to the prior art according to FIG. 1 in that no metal sheet circular blank 4 is provided. Instead, the impeller 1 has a somewhat larger internal diameter as compared to the external rotor motor 8, namely in order to generate, by a given play, an intermediate space that is provided as an annular space 9 and serves for accommodation of an adhesive medium 10. Accordingly, the impeller 1 according to FIG. 2 is provided with contact surfaces 5 that serve as adhesive surfaces.

[0038] Moreover, the impeller 1 shown in FIG. 2 comprises fins 6 that serve for centring and sealing surfaces 7 that are aimed to prevent the adhesive medium 10, in particular glue, from being pushed out of the annular space 9.

[0039] FIG. 3 shows a schematic view of the entire arrangement of the impeller 1 on an external rotor motor 8, whereby the figure only indicates that an annular space 9 filled with adhesive medium 10, namely a suitable glue, is formed between the impeller 1 and the external rotor motor 8. A secure torsion-proof adhesive connection between the impeller 1 and the external rotor 8 is established. The fins 6 shown in FIG. 2 serve for centring.

[0040] Referring to further advantageous refinements of the device according to the invention, reference shall be made to the general part of the description and the appended patent claims in order to avoid repetitions.

[0041] And lastly, it shall be noted explicitly that the exemplary embodiment of the device according to the invention described above only serves for illustration of the claimed teaching, but does not limit said teaching to the exemplary embodiment.

LIST OF REFERENCE NUMBERS

[0042] 1 Impeller [0043] 2 Vane [0044] 3 Impeller hub, hub [0045] 4 Sheet metal circular blank [0046] 5 Contact surface [0047] 6 Fin, centring fin [0048] 7 Sealing surface [0049] 8 Rotor (of the motor), external rotor (of the external rotor motor) [0050] 9 Intermediate space, annular space [0051] 10 Adhesive medium