A ROTOR BLADE INTENDED FOR A ROTOR IN A MIXER AND A ROTOR-STATOR SYSTEM

Abstract

The present invention describes a rotor blade (1) intended for a rotor in a mixer, said rotor blade (1) having a main body (2) and multiple rotor wings (3) extending out from one side of the main body (2), wherein there is provided a gap (10) between each pair of rotor wings (3), and wherein the gap (10) extends outwards towards a peripheral part of the rotor blade (1) in an angled or bent surface (100) in relation to a horizontal plane of the main body (2) of the rotor blade (1). The invention also describes rotor-stator system.

Claims

1. A rotor blade intended for a rotor in a mixer, said rotor blade having a main body and multiple rotor wings extending out from one side of the main body, wherein there is provided a gap between each pair of rotor wings, and wherein the gap extends outwards towards a peripheral part of the rotor blade in an angled or bent surface in relation to a horizontal plane of the main body of the rotor blade.

2. The rotor blade according to claim 1, wherein each gap extends outwards towards a peripheral part of the rotor blade in an angled or bent surface.

3. The rotor blade according to claim 1, wherein the angled or bent surface extends in an overlapping surface which is intended as an overlap between the rotor blade when being connected to a stator part comprising a cone or cylinder .

4. The rotor blade according to claim 3, wherein the overlapping surface has a length in a range of above 0 mm and maximum 55 mm, preferably in a range of above 0 mm and maximum 20 mm, more preferably in range of above 0 mm and maximum 10 mm.

5. The rotor blade according to claim 3 , wherein the overlapping surface comprises a channel, preferably the channel is provided in a close proximity to an end of the angled or bent surface.

6. The rotor blade according to claim 1, wherein the angled or bent surface is angled or bent upwards in relation to a horizontal plane of the main body of the rotor blade.

7. The rotor blade according to claim 3, wherein the angled or bent surface has at least a concave portion in proximity to the overlapping surface.

8. The rotor blade according to claim 1, wherein each of the multiple rotor wings has a protrusion provided along the extension of said at least one rotor wing, wherein, in a front side of the rotor wing in a rotational direction, said at least one rotor wing extends through a point A.sub.2 being a point furthest away from the rotational direction and further up extends through a point A.sub.1 being a point furthest into the rotation direction, and wherein the point A.sub.1 is provided as a most vertical top end point of the protrusion or at least in a horizontal top end plane of the protrusion.

9. The rotor blade according to claim 8, wherein said at least one rotor wing extends through the point A.sub.2 being a point furthest away from a rotational direction and further up extends through the point A.sub.1 being a point furthest into the rotation direction, said points A.sub.2 and A.sub.1 having a distance A between each other so that A>0, and/or wherein the protrusion is at an end of said at least one rotor wing.

10. (canceled)

11. The rotor blade according to claim 9, wherein the end of the protrusion has a thickness C, extending from a bottom point B.sub.2 to the top point, preferably to a top point A.sub.1 being a point furthest into the rotation direction, preferably wherein C is in the range of 3-30 mm, preferably the top point A.sub.1 is further into the rotation direction than the bottom point B.sub.2 of the end of the protrusion, which implies that the end of the protrusion is inclined or bent outwards in the rotational direction, seen from the bottom point B.sub.2 and up to the top point A.sub.1, preferably the bottom point B.sub.2 and the top point A.sub.1 defines and angle B with an imaginary perpendicular end of the protrusion, and wherein angle B is in the range of from 15 to 60.

12. (canceled)

13. (canceled)

14. The rotor blade according to claim 8, wherein there is provided an end surface arranged from the top point A.sub.1 to a bottom point B.sub.2 of the end, and wherein the end surface has an inclination or is concave, preferably is inclined, and/or wherein the height H of said at least one rotor wing extends from said one side of the main body of the rotor blade and to the top of said at least one rotor wing, preferably wherein the top is in a point A.sub.1 being a point furthest into the rotation direction, wherein H is at least 2*A, preferably wherein A/H is in a range of 1/50-2/5, more preferably wherein A/H is in a range of 1/25-1/5, most preferably A is maximum 300 mm, and/or wherein the height H of said at least one rotor wing extends from said one side of the main body of the rotor blade and to the top of said at least one rotor wing, and wherein H is less than D where D is the diameter of the main body of the rotor blade, preferably H is at most D/2.

15. (canceled)

16. (canceled)

17. The rotor blade according to claim 8, wherein the protrusion is provided as a hook extension at an end of said at least one rotor wing, said hook extension implying that said at least one rotor wing extends with a non-perpendicular angle from the main body in a direction pointing away from the rotational direction, somewhere along the extension of said at least one rotor wing, and then bends back in the rotational direction to provide for the hook extension in the rotational direction.

18. The rotor blade according to claim 1, wherein said multiple rotor wings extend from an outer periphery of the main body, said main body preferably being circular.

19. The rotor blade according to claim 1, wherein said multiple rotor wings extend perpendicular from a geometrical XY coordinate plane of said one side of the main body or extend with an angle ax in a X direction and/or an angle ay in the Y direction from a totally perpendicular extension from the geometrical XY coordinate plane of said one side of the main body.

20. A rotor-stator system comprising a rotor blade intended for a rotor in a mixer, said rotor blade having a main body and multiple rotor wings extending out from one side of the main body, wherein there is provided a gap between each pair of rotor wings, wherein the gap provides a surface extending in an overlapping surface which functions as a separate but overlapping surface of the rotor blade in relation to a cone or cylinder of a stator part of the rotor-stator system.

21. The rotor-stator system according to claim 20, wherein the overlapping surface has a length in a range of above 0 mm and maximum 55 mm, preferably in a range of above 0 mm and maximum 20 mm, more preferably in range of above 0 mm and maximum 10 mm.

22. The rotor-stator system according to claim 20, wherein the overlapping surface comprises a channel, preferably the channel is provided in a close proximity to an end of the angled or bent surface.

23. The rotor-stator system according to claim 20, wherein S is a spraying angle out from the overlapping surface; K is a direction angle of the cone or cylinder; and wherein a difference of angle S and angle K to each other is maximum 60 degrees, preferably maximum 45 degrees, more preferably maximum 30 degrees, most preferably maximum 20 degrees, and/or wherein V is an angle difference for a material being mixed when leaving the angled or bent surface of the rotor blade and entering into a surface of the cone or cylinder of the stator part, wherein V=KS; and wherein 30<V<30.

24. The rotor-stator system according to claim 20, with a rotor blade according to claim 1.

25. (canceled)

26. The rotor-stator system according to claim 20, wherein there is arranged a rotor-stator slot between the overlapping surface of the rotor blade on an underside of the rotor blade and the cone or cylinder of a stator part, and preferably wherein the rotor-stator slot has a length of 20 mm, preferably maximum 15 mm, most preferably maximum 10 mm, preferably the rotor-stator slot is arranged to extend into a geometrical expansion.

27. (canceled)

28. (canceled)

Description

DETAILED DESCRIPTION OF THE DRAWINGS

[0028] In FIGS. 1a and 1b there are shown one embodiment of a rotor-stator system according to the present invention. The rotor blade 1 comprises a main body 2 and multiple rotor wings 3 extending out from one side of the main body 2, where there is provided gaps 10 between each pair of rotor wings 3, and where the gaps 10 extends outwards towards a peripheral part of the rotor blade 1 in an angled or bent surface 100 (see FIG. 2a). The system also comprises a cone or cylinder 20 of a stator part of the rotor-stator system. It should be noted that the rotor-stator should also be connected to other parts of the system, such as a framework where an intended outflow is defined. This outflow may be of many different types, such as only one opening or a grid with several openings.

[0029] In FIG. 2a there is shown a cross section of part of a rotor-stator system according to one embodiment of the present invention. In this case, a rotor wing 3 is shown. The gap 10 has a surface 100 extending in an overlapping surface 101 which functions as a separate but overlapping surface of the rotor blade 1 in relation to a cone or cylinder 20 of a stator part of the rotor-stator system.

[0030] In FIG. 2b there is shown another view of minor part of a rotor-stator system according to one embodiment of the present invention. In this case only a minor part of gap 10 provided between a pair of rotor wings 3 is shown. The gap 10 has a surface 100 (see FIG. 2 a) extending in an overlapping surface 101 which is an overlapping surface of the rotor blade 1 in relation to a cone or cylinder 20 of a stator part of the rotor-stator system, and wherein there is provided a slot between the overlapping surface 101 and the other side being the cone or cylinder 20 of the stator part. As seen, the slot has a length shown as SlotL. Moreover, S is a spraying angle out from the overlapping surface 100, K is a direction angle of the cone or cylinder 20. According to the present invention, a difference of angle S and angle K to each other is maximum 60 degrees.

[0031] In FIG. 3 there is shown a rotor wing 3 which is a potential part of the rotor blade according to one embodiment of the present invention. The rotor wing 3 has a protrusion 4 provided along the extension of said at least one rotor wing 3. As may be seen, in a front side of the rotor wing 3 in a rotational direction, said at least one rotor wing 3 extends through a point A.sub.2 being a point furthest away from the rotational direction and further up extends through a point A.sub.1 being a point furthest into the rotation direction, and wherein the point A.sub.1 in this case is provided as a most vertical top end point of the protrusion 4. Furthermore, in this case said points A.sub.2 and A.sub.1 has a distance A between each other so that A>0. Moreover, the rotor wing also has a top 6. Furthermore, according to this embodiment, the end 5 of the protrusion 4 has a thickness C, extending from a bottom point B.sub.2 to the top point, and in this case to a top point A.sub.1 being a point furthest into the rotation direction.

[0032] Moreover, in this embodiment, the bottom point B.sub.2 and the top point A.sub.1 defines and angle B with an imaginary perpendicular end 5 of the protrusion 4. Furthermore, the height H of said at least one rotor wing 3 extends from one side of the main body 2 of the rotor blade 1 and to the top 6 of said at least one rotor wing 3, wherein H is at least 2*A.