ROTOR BLADES FOR A MIXER WITH EXTENDED PROTRUSION ON THE ROTOR BLADES

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 2a of the main body 2, wherein at least one of the multiple rotor wings 3 has a protrusion 4 provided along the extension of said at least one rotor wing 3, wherein, in a front side of the rotor wing 3 in a rotational direction, said at least one rotor wing 3 extends through a point A2 being a point furthest away from the rotational direction and further up extends through a point A1 being a point furthest into the rotation direction, and wherein the point A1 is provided as a most vertical top end point of the protrusion 4 or at least in a horizontal top end plane of the protrusion 4.

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 at least one 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.

2. The rotor blade according to claim 1, 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.

3. The rotor blade according to claim 1, wherein the protrusion is at an end of said at least one rotor wing.

4. The rotor blade according to claim 3, 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.

5. The rotor blade according to claim 4, wherein 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.

6. The rotor blade according to claim 5, wherein 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?.

7. The rotor blade according to claim 1, wherein there is provided an end surface arranged from the top point A.sub.1 to the bottom point B.sub.2 of the end, and wherein the end surface has an inclination or is concave, preferably is inclined.

8. The rotor blade according to claim 2, 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.

9. The rotor blade according to claim 2, 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.

10. The rotor blade according to claim 2, 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.

11. The rotor blade according to claim 1, wherein at least several of the multiple rotor wings have protrusions, preferably at the ends of the multiple rotor wings.

12. 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.

13. 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 in a X direction and/or an angle in the Y direction from a totally perpendicular extension from the geometrical XY coordinate plane of said one side of the main body.

14. The rotor blade according to claim 1, wherein the rotor blade has a center unit intended for connecting the rotor blade to a rotor in a mixer.

Description

DESCRIPTION OF THE DRAWINGS

[0018] In FIG. 1 there is shown a rotor wing 3 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 at least one rotor wing 3 extends through a point A.sub.2 being a point furthest away from a rotational direction and further up extends through a 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. 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.

[0019] 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 2a 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.

[0020] In FIG. 2 there is shown a rotor blade according to one embodiment of the present invention. The rotor blade 1 has a main body 2 and multiple rotor wings 3 extending out from one side 2a of the main body 2, and where, in this case, all the multiple rotor wings 3 have a protrusion 4 provided along the extension of each rotor wing 3. Moreover, in this case the rotor blade 1 has a center unit 100 intended for connecting the rotor blade 1 to a rotor in a mixer.