Rotor and stirring device

Patent metadata

Field	Value
Publication number	US-10384177-B2
Application number	US-201515320442-A
Country	US
Kind code	B2
Filing date	Aug 12, 2015
Priority date	Aug 13, 2014
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

The present invention relates to a rotor that comprises a series of shaped rotor blades whose circumferential section forms a standard NACA four-digit airfoil. Said rotor can be inserted in a stirring device that also comprises a stator, on whose inner surface shaped stator blades are positioned, whose circumferential section forms a standard NACA four-digit airfoil.

First claim

The invention claimed is:

1. A rotor which includes a shaft, a series of shaped rotor blades arranged along the whole or part of the length of said shaft, said blades extending parallel to a plane orthogonal to a rotational axis of said shaft; said series of shaped rotor blades contains at least one level of shaped rotor blades; each level contains at least two shaped rotor blades equally spaced about said shaft; said shaped rotor blades are connected to said shaft by means of one of their ends;
a) wherein the shaped rotor blade comprises at least one reversal point of the thrust to the fluid, said reversal point divides said shaped rotor blade into at least two elements which extend radially with respect to one another, so that each element has a direction of thrust in the opposite direction with respect to the other,
b) wherein the circumferential section of each element forms a standard NACA four-digit airfoil shown as Digit 1, Digit 2, Digit 3 and Digit 4, in which:
i. the parameters m, p, and t range radially along the direction of extension of the shaped rotor blade,
ii. the chord length c that connects the leading edge with the trailing edge of said profile varies radially along the direction of extension of the shaped rotor blade,
iii. the chord has an inclination a with respect to the orthogonal plane to the rotation axis that varies radially along the direction of extension of the shaped rotor blade.

2. The rotor according to claim 1 in which m ranges between 0.001 and 0.25, p ranges between 0.01 to 0.85, t ranges between 0.015 and 0.75, the chord length c ranges between 0.02 and 0.25 times the rotor diameter D, and wherein the angle α of inclination of the chord ranges between 15° and 75° with the plane orthogonal to the rotation axis.

3. The rotor according to claim 2 wherein the circumferential section of the shaped rotor blade in correspondence of the connection with the shaft forms said airfoil in which m ranges from 0.001 to 0.15, p ranges from 0.01 to 0.85, t ranges from 0.2 to 0.75, c ranges from 0.02 to 0.15, α ranges from 20° to 75°.

4. The rotor according to claim 2 wherein the circumferential section of the shaped rotor blade in correspondence of the connection of the first element with the reversal point forms said airfoil in which m ranges from 0.001 to 0.25, p ranges from 0.01 to 0.7, t ranges from 0.2 to 0.65, c ranges from 0.02 to 0.2, α ranges from 15° to 60°.

5. The rotor according to claim 2 wherein the circumferential section of the shaped rotor blade in correspondence of the connection of the second element with the reversal point forms said airfoil in which m ranges from 0.001 to 0.15, p ranges from 0.01 to 0.7, t ranges from 0.02 to 0.25, c ranges from 0.04 to 0.2, α ranges from 20° to 60°.

6. The rotor according to claim 2 wherein the circumferential section of the shaped rotor blade in correspondence of the outer end of said blade form said airfoil in which m ranges from 0.001 to 0.25, p ranges from 0.01 to 0.75, t ranges from 0.015 to 0.25, c ranges from 0.04 to 0.25, α ranges from 15° to 45°.

7. The rotor according to claim 1 wherein said airfoil of the shaped rotor blade is made with a curvilinear profile; or with a segmented continuous profile consisting of n segments in which two consecutive segments form an angle β, where n ranges between 2 and 10 and β ranges between 0.1° and 270°.

8. The rotor according to claim 1 wherein said airfoil of the shaped rotor blade is realized with a continuous profile consisting of a combination of curvilinear sections and n segments in which two consecutive segments form an angle β which ranges between 0.1° and 270°, with n varying between 2 and 10.

9. A stirring device comprising:
the rotor according to claim 1 , which has the function of agitating a single-phase or multiphase fluid imparting motion, and
a stator that comprises an outer body and a series of shaped stator blades arranged on all or part of the inner side surface of said body; said series of shaped stator blades contains at least one level of shaped stator blades; each level contains at least two shaped stator blades equally spaced in the angular direction; the shaped stator blades are fixed to the inner side surface of said outer body by one of their ends, said stator having the function of transforming the motion generated by the rotor into predominantly axial flow.

10. A stirring device according to claim 9 in which the shaped stator blade has the following features:
the shaped stator blade includes at least one reversal point of the thrust to the fluid which divides it into at least two elements in such a way that each element has a direction of thrust in the opposite direction with respect to the other,
the circumferential section of each element forms a standard NACA four-digit airfoil, indicated as Digit 1, Digit 2, Digit 3 and Digit 4, in which:
i. the parameters m, p, t vary radially along the direction of extension of the shaped stator blade element,
ii. the chord length c that connects the leading edge with the trailing edge of said profile varies radially along the direction of extension of the stator blade shaped element,
iii. the chord has an inclination a with respect to the plane orthogonal to rotation axis which varies radially along the direction of extension of the shaped stator blade.

11. The device according to claim 10 in which the circumferential section of the shaped stator blade forms said airfoil in which the parameter m ranges between 0.001 and 0.16, p ranges between 0.01 to 0.8, t ranges from 0.05 to 0.8, c ranges between 0.02 and 0.15 times the rotor diameter D, the angle α of inclination of the chord ranges between 25° and 80° relative to the plane orthogonal to rotation axis.

12. The device according to claim 11 in which the circumferential section of the shaped stator blade in correspondence of the inner end of said blade forms said airfoil in which m ranges from 0.001 to 0.16, p ranges from 0.01 to 0.8, t ranges from 0.05 to 0.3, c ranges from 0.02 to 0.15, α ranges from 30° to 70°.

13. The device according to claim 11 in which the circumferential section of the shaped stator blade in correspondence of the connection of the first element with the reversal point forms said airfoil in which m ranges from 0.001 to 0.15, p ranges from 0.01 to 0.75, t ranges from 0.15 to 0.6, c ranges from 0.02 to 0.15, α ranges from 40° to 80°.

14. The device according to claim 11 in which the circumferential section of the shaped stator blade in correspondence of the connection of the second element with the reversal point forms said airfoil in which m ranges from 0.001 to 0.15, p ranges from 0.01 to 0.75, t ranges from 0.2 to 0.8, c ranges from 0.02 to 0.15, α ranges from 25° to 75°.

15. The device according to claim 11 in which the circumferential section of the shaped stator blade in correspondence of the connection with the wall of the stator forms said airfoil in which m ranges from 0.001 to 0.15, p ranges from 0.01 to 0.75, t ranges from 0.2 to 0.8, c ranges from 0.02 to 0.15, α ranges from 25° to 75°.

16. The device according to claim 10 , wherein said airfoil of the shaped stator blade is made with a curved profile; or with a continuous segmented profile consisting of n segments in which two consecutive segments form an angle β, where n ranges between 2 and 10 and β ranges between 0.1° and 270°.

17. The device according to claim 10 wherein said airfoil of the shaped stator blade is realized with a continuous profile consisting of a combination of curvilinear and n segments in which two consecutive segment

Assignees

• Versalis Spa

Inventors

• Regattieri Giovanni
• Marchetti Gianni
• Brandolin Alessandro

Classifications

• B01F7/22

  Operations & Transport · mapped topic

• B01F7/00641

  Operations & Transport · mapped topic

• B01F7/1675

  Operations & Transport · mapped topic

• B01F7/00266

  Operations & Transport · mapped topic

• B01F7/00208

  Operations & Transport · mapped topic