Impeller wheel for diagonal or radial fans, injection molding tool for manufacturing such an impeller wheel, and device comprising such an impeller wheel

1. An impeller wheel for diagonal or radial fans, the impeller wheel comprising:

a bottom disc ( 7 );

a cover disc ( 1 );

three-dimensionally shaped blades ( 6 ) connected to the bottom disc ( 7 ) and the cover disc ( 1 ), wherein the bottom disc ( 7 ), the cover disc ( 6 ), and the three-dimensionally shaped blades ( 6 ) together form a monolithic part;

wherein the three-dimensionally shaped blades ( 6 ) each comprise a leading edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), and a trailing edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), wherein the leading edge and the trailing edge each have a median diameter;

wherein, in a projection onto a cylinder that is coaxial to a rotation axis ( 13 ) of the impeller wheel and has a diameter matching a median diameter of the trailing edge or of the leading edge, a first extension of the trailing edge at the cover disc ( 1 ) is positioned at a first angle (β 1 ), measured between a tangent to the trailing edge at the cover disc ( 1 ) and a line that is parallel to the rotation axis ( 13 ), and a second extension of the trailing edge at the bottom disc ( 7 ) is positioned at a second angle (β 2 )), measured between a tangent to the trailing edge at the bottom disc ( 7 ) and a line that is parallel to the rotation axis ( 13 ), wherein at least one of the first and second angles (β 1 , β 2 ) is different from 0°.

2. The impeller wheel according to claim 1 , wherein a diameter of the cover disc ( 1 ), when viewed in an axial section view, increases from an air inlet ( 5 ) of the impeller wheel in a direction toward an air outlet ( 4 ) of the impeller wheel.

3. The impeller wheel according to claim 2 , wherein a generatrix of the cover disc ( 1 ) is curved such that the diameter of the cover disc ( 1 ) steadily increases from the air inlet ( 5 ) in the direction toward the air outlet ( 4 ).

4. The impeller wheel according to claim 3 , wherein the generatrix extends in a straight line at a distance from the air inlet ( 5 ).

5. The impeller wheel according to claim 1 , wherein a diameter of the bottom disc ( 7 ), when viewed in an axial section view, increases in a direction away from a side of the bottom disc ( 7 ) that is facing the cover disc ( 1 ).

6. The impeller wheel according to claim 5 , wherein a generatrix of the bottom disc ( 7 ) extends in a curved shape in the direction away from the side facing the cover disc such that the diameter of the bottom disc ( 7 ) increases.

7. The impeller wheel according to claim 6 , wherein the generatrix extends in a straight line at a distance from an end of the generatrix facing the cover disc ( 1 ).

8. The impeller wheel according to claim 1 , wherein the bottom disc has a free edge positioned at a third angle (α 2 ), viewed in an axial section view, relative to a radial line, wherein the cover disc ( 1 ) has an end defining an air outlet ( 4 ) and the end defining the air outlet ( 4 ) is positioned at a fourth angle (α 1 ), viewed in an axial section view, relative to a radial line, wherein the third angle is smaller than the fourth angle.

9. The impeller wheel according to claim 1 , wherein a transitional region of the blades into the cover disc ( 1 ) and/or into the bottom disc ( 7 ) has a rounded shape.

10. The impeller wheel according to claim 9 , wherein the transition region of the blades ( 6 ) into the cover disc ( 1 ) and/or into the bottom disc ( 7 ) has a different width on opposed sides of the blades ( 6 ).

11. The impeller wheel according to claim 9 , wherein the rounded shape in a direction (dy) of the blades away from the bottom disc differs in width from the rounded shape in a direction (dx) of the bottom disc ( 7 ) away from the blades.

12. The impeller wheel according to claim 9 , wherein the rounded shape in a direction (dy) of the blades away from the cover disc differs in width from the rounded shape in a direction (dx) of the cover disc away from the blades.

13. The impeller wheel according to claim 1 , wherein the bottom disc ( 7 ) comprises an interface ( 9 , 21 ) configured to connect the impeller wheel to a motor ( 39 ).

14. The impeller wheel according to claim 13 , wherein the interface ( 9 ) is a ring-shaped disc provided on an inner edge of the bottom disc ( 7 ).

15. The impeller wheel according to claim 13 , wherein the interface ( 9 ) is situated within a region covered by the blades ( 6 ), when viewed in the axial direction of the impeller wheel.

16. The impeller wheel according to claim 13 , wherein the interface ( 21 ) is positioned at a distance from an inner edge of the bottom disc ( 7 ) and is formed by support sleeves that protrude from an outer side ( 22 ) of the bottom disc ( 7 ) that is facing away from the cover disc.

17. The impeller wheel according to claim 16 , wherein self-tapping plastic screws are screwed into the support sleeves for connecting the impeller wheel to the motor.

18. The impeller wheel according to claim 1 , further comprising a flow cap ( 32 ) placed onto an inner edge of the bottom disc ( 7 ).

19. The impeller wheel according to claim 18 , wherein the flow cap ( 32 ) has an exterior side ( 38 ) that forms at least approximately a steady continuation of an inner side ( 20 ) of the bottom disc ( 7 ) that is facing the cover disc.

20. The impeller wheel according to claim 1 , wherein the first and second angles (β 1 , β 2 ) differ from each other.

21. The impeller wheel according to claim 20 , wherein the first angle (β 1 ) is greater than the second angle (β 2 ).

22. An injection molding tool for manufacturing the impeller wheel according to claim 1 , the injection molding tool comprising:

molding parts into which a plastic material is injected to manufacture the impeller wheel, wherein the molding parts include at least one mold insert and two sliders for manufacturing the bottom disc ( 7 ) with an interface ( 9 , 21 ), wherein the at least one mold insert is arranged between the two sliders.

23. The injection molding tool according to claim 22 , wherein the at least one mold insert ( 30 ) is an adapter insert into which auxiliary mold inserts ( 31 ) for forming the interface ( 9 , 21 ) are inserted.

24. A device comprising at least one fan ( 43 ) with an impeller wheel according to claim 1 .

25. The device according to claim 24 , wherein the device ( 42 ) comprises at least two fans ( 43 ), arranged side by side.

26. The device according to claim 25 , wherein an axial distance (Dax) between the at least two fans ( 43 ) is at most approximately 1.75*D 1 , wherein D 1 denotes a diameter of the cover disc ( 1 ) in a region of an air outlet ( 4 ) of the cover disc.

27. The device according to claim 24 , comprising an interior space that is connected to a pressure side of the at least one fan, wherein the interior space has a diameter or a radial sidewall distance (Dg) of at most approximately 1.75*D 1 , wherein D 1 denotes the diameter of the cover disc ( 1 ) in a region of an air outlet ( 4 ) of the cover disc.

28. An impeller wheel for diagonal or radial fans, the impeller wheel comprising:

a bottom disc ( 7 );

a cover disc ( 1 );

three-dimensionally shaped blades ( 6 ) connected to the bottom disc ( 7 ) and the cover disc ( 1 ), wherein the bottom disc ( 7 ), the cover disc ( 6 ), and the three-dimensionally shaped blades ( 6 ) together form a monolithic, injection-molded part of plastic material;

wherein the three-dimensionally shaped blades ( 6 ) each comprise a leading edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), and a trailing edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), wherein the leading edge and the trailing edge each have a median diameter;

wherein, in a projection onto a cylinder that is coaxial to a rotation axis ( 13 ) of the impeller wheel and has a diameter matching a median diameter of the trailing edge or of the leading edge, a first extension of the trailing edge and/or of the leading edge at the cover disc ( 1 ) is positioned at a first angle (β 1 ), measured between a tangent to the trailing edge and/or to the leading edge at the cover disc and a line that is parallel to the rotation axis ( 13 ), and a second extension of the trailing edge and/or of the leading edge at the bottom disc is positioned at a second angle (β 2 ), measured between a tangent to the trailing edge and/or to the leading edge at the bottom disc and a line that is parallel to the rotation axis ( 13 ), wherein the first and second angles (β 1 , β 2 ) differ from each other by at least 10°, wherein the first and second angles (β 1 , β 2 ) each are greater than 10°, and wherein the first angle (β 1 ) is greater than the second angle (β 2 ).

29. An impeller wheel for diagonal or radial fans, the impeller wheel comprising:

a bottom disc ( 7 );

a cover disc ( 1 );

three-dimensionally shaped blades ( 6 ) connected to the bottom disc ( 7 ) and the cover disc ( 1 ), wherein the bottom disc ( 7 ), the cover disc ( 6 ), and the three-dimensionally shaped blades ( 6 ) together form a monolithic part;

wherein the three-dimensionally shaped blades ( 6 ) each comprise a leading edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), and a trailing edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), wherein the leading edge and the trailing edge each have a median diameter;

wherein, in a projection onto a cylinder that is coaxial to a rotation axis ( 13 ) of the impeller wheel and has a diameter matching a median diameter of the trailing edge or of the leading edge, a first extension of the trailing edge and/or of the leading edge at the cover disc is positioned at a first angle (β 1 ), measured between a tangent to the trailing edge and/or to the leading edge at the cover disc and a line that is parallel to the rotation axis ( 13 ), and a second extension of the trailing edge and/or the leading edge at the bottom disc is positioned at a second angle (β 2 ), measured between a tangent to the trailing edge and/or to the leading edge at the bottom disc and a line that is parallel to the rotation axis ( 13 ), wherein the first and second angles (β 1 , β 2 ) are greater than 10°, wherein the first and second angles (β 1 , β 2 ) differ from each other by at least 10°, and wherein the first angle (β 1 ) is greater than the second angle (β 2 ).

30. An impeller wheel for diagonal or radial fans, the impeller wheel comprising:

a bottom disc ( 7 );

a cover disc ( 1 );

three-dimensionally shaped blades ( 6 ) connected to the bottom disc ( 7 ) and the cover disc ( 1 ), wherein the bottom disc ( 7 ), the cover disc ( 6 ), and the three-dimensionally shaped blades ( 6 ) together form a monolithic, injection-molded part;

wherein the three-dimensionally shaped blades ( 6 ) each comprise a leading edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), and a trailing edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), wherein the leading edge and the trailing edge each have a median diameter;

wherein, in a projection onto a cylinder that is coaxial to a rotation axis ( 13 ) of the impeller wheel and has a diameter matching a median diameter of the trailing edge or of the leading edge, a first extension of the trailing edge and/or of the leading edge at the cover disc is positioned at a first angle (β 1 ), measured between a tangent to the trailing edge and/or to the leading edge at the cover disc and a line that is parallel to the rotation axis ( 13 ), and a second extension of the trailing edge and/or of the leading edge at the bottom disc is positioned at a second angle (β 2 ), measured between a tangent to the trailing edge and/or to the leading edge at the bottom disc and a line that is parallel to the rotation axis ( 13 ), wherein the first and second angles (β 1 , β 2 ) are greater than 10°, wherein the first and second angles (β 1 , β 2 ) differ from each other by at least 10°, and wherein the first angle (β 1 ) is greater than the second angle (β 2 ).

31. An impeller wheel for diagonal or radial fans, the impeller wheel comprising:

a bottom disc ( 7 );

a cover disc ( 1 );

three-dimensionally shaped blades ( 6 ) connected to the bottom disc ( 7 ) and the cover disc ( 1 ), wherein the bottom disc ( 7 ), the cover disc ( 6 ), and the three-dimensionally shaped blades ( 6 ) together form a monolithic part;

wherein the three-dimensionally shaped blades ( 6 ) each comprise a leading edge and a trailing edge, wherein the leading edge and the trailing edge each have a median diameter;

wherein, in a projection onto a cylinder that is coaxial to a rotation axis ( 13 ) of the impeller wheel and has a diameter matching a median diameter of the trailing edge or of the leading edge, a first extension of the trailing edge and a first extension of the leading edge are positioned at a first angle (β 1 ) relative to a line that is parallel to the rotation axis ( 13 ), and a second extension of the trailing edge and a second extension of the leading edge are positioned at a second angle (β 2 ) relative to a line that is parallel to the rotation axis ( 13 ), wherein at least one of the first and second angles (β 1 , β 2 ) is different from 0°.

32. An impeller wheel for diagonal or radial fans, the impeller wheel comprising:

a bottom disc ( 7 );

a cover disc ( 1 );

three-dimensionally shaped blades ( 6 ) connected to the bottom disc ( 7 ) and the cover disc ( 1 ), wherein the bottom disc ( 7 ), the cover disc ( 6 ), and the three-dimensionally shaped blades ( 6 ) together form a monolithic part;

wherein the three-dimensionally shaped blades ( 6 ) each comprise a leading edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), and a trailing edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), wherein the leading edge and the trailing edge each have a median diameter;

wherein, in a projection onto a cylinder that is coaxial to a rotation axis ( 13 ) of the impeller wheel and has a diameter matching a median diameter of the trailing edge or of the leading edge, a first extension of the trailing edge at the cover disc is positioned at a first angle (β 1 ), measured between a tangent to the trailing edge at the cover disc and a line that is parallel to the rotation axis ( 13 ), and a second extension of the trailing edge at the bottom disc is positioned at a second angle (β 2 ), measured between a tangent to the trailing edge at the bottom disc and a line that is parallel to the rotation axis ( 13 ), wherein the first and second angles (β 1 , β 2 ) differ from each other by at least 10°, wherein the first and second angles (β 1 , β 2 ) each are greater than 10°, and wherein the first angle (β 1 ) is greater than the second angle (β 2 ).

33. An impeller wheel for diagonal or radial fans, the impeller wheel comprising:

a bottom disc ( 7 );

a cover disc ( 1 );

three-dimensionally shaped blades ( 6 ) connected to the bottom disc ( 7 ) and the cover disc ( 1 ), wherein the bottom disc ( 7 ), the cover disc ( 6 ), and the three-dimensionally shaped blades ( 6 ) together form a monolithic part;

wherein the three-dimensionally shaped blades ( 6 ) each comprise a leading edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), and a trailing edge, extending from the bottom disc ( 7 ) to the cover disc ( 1 ), wherein the leading edge and the trailing edge each have a median diameter;

wherein, in a projection onto a cylinder that is coaxial to a rotation axis ( 13 ) of the impeller wheel and has a diameter matching a median diameter of the trailing edge or of the leading edge, a first extension of the leading edge at the cover disc is positioned at a first angle (β 1 ), measured between a tangent to the leading edge at the cover disc and a line that is parallel to the rotation axis ( 13 ), and a second extension of the leading edge at the bottom disc is positioned at a second angle (β 2 ), measured between a tangent to the leading edge at the bottom disc and a line that is parallel to the rotation axis ( 13 ), wherein at least one of the first and second angles (β 1 , β 2 ) is different from 0°.