Claims
- 1. A surface aeration impeller designed to rotate about an axis perpendicular to a static liquid surface, said impeller comprising a plurality of blades attached to a mounting member, said mounting member being generally disc-shaped, having top and bottom surfaces, and being mountable on a shaft for rotation about said axis;
wherein said blades comprise an upper generally vertical section and a lower inclined non-vertical section that extends downwardly and outwardly in the direction of rotation, and wherein the height of the outer edge of said upper section of said blades is between 0.05 and 0.25 d, where d is the diameter of the impeller.
- 2. A surface aeration impeller designed to rotate about an axis perpendicular to a static liquid surface, said impeller comprising a plurality of blades attached to a mounting member, said mounting member being generally disc-shaped, having top and bottom surfaces, and being mountable on a shaft for rotation about said axis;
wherein said blades comprise an upper generally vertical section and a lower inclined non-vertical section that extends downwardly and outwardly in the direction of rotation, and wherein the height of the outer edge of said lower section of said blades is between 0.03 and 0.2 d, where d is the diameter of the impeller.
- 3. The surface aeration impeller according to claim 1;wherein the height of the outer edge of said lower section of said blades is between 0.03 and 0.2 d.
- 4. The surface aeration impeller according to claim 1 or 2 wherein the lower section of each blade forms an angle β with respect to the horizontal wherein β is from about 20° to 60°.
- 5. The surface aeration impeller according to claim 1 or 2 wherein the upper generally vertical section of the blades is mounted underneath the disc shaped mounting member non-radially such that an angle α is formed between an imaginary radial line through the outer edge of the upper section and a line formed by the top edge of said upper section; and wherein said angle α is between about 20° to 60°.
- 6. The surface aeration impeller according to claim 5 wherein α and β are from about 30° to 50°.
- 7. The surface aeration impeller according to claim 6 wherein α is from about 30° to 45° and β is from about 35° to 45°.
- 8. The surface aeration impeller according to claim 1 having from 6 to 12 blades.
- 9. The surface aeration impeller according to claim 8 having about 8 blades.
- 10. The surface aeration impeller according to claim 5 wherein the height of the lower section is less than the height of the upper section.
- 11. The surface aeration impeller according to claim 1 wherein said blades additionally contain an endcap.
- 12. The surface aeration impeller according to claim 6 wherein the height of the outer edge of said upper section of said blades is between about 0.1 and 0.2 d.
- 13. The surface aeration impeller according to claim 6 wherein the height of the outer edge of said lower section of said blades is between about 0.05 and 0.1 d.
- 14. The surface aeration impeller according to claim 5 wherein said blades contain only planer, non-curved segments.
- 15. A surface aeration impeller designed to rotate about an axis perpendicular to a static liquid surface, said impeller comprising a plurality of blades attached to a mounting member, said mounting member being generally disc shaped, having top and bottom surfaces, and being mountable on a shaft for rotation about said axis;
wherein said blades are attached to the bottom of said disc shaped mounting member; wherein said blades are continuously curved downwardly and outwardly in the direction of rotation and begin at the top with a substantially vertical section and end with an outwardly facing non vertical section that will lie at least partially under the liquid surface and is sufficient in size and shape to provide a substantially upward pumping flow of liquid when the impeller is rotated; and wherein the height of the outer edge of said curved blade is between 0.05 and 0.25 d, where d is the diameter of the impeller.
RELATED APPLICATIONS
[0001] This application is a Continuation of application Ser. No. 10/244,349, filed on Sep. 16, 2002, now U.S. Pat. No. 6,715,912 issued on Apr. 6, 2004, which is a Continuation In Part of application Ser. No. 09/895,418 filed Jul. 2, 2001, now U.S. Pat. No. 6,464,384, which is a Continuation of application Ser. No. 09/358,502, filed Jul. 21, 1999, now abandoned, which is a Continuation of application Ser. No. 09/162,088 filed Sep. 28, 1998, now U.S. Pat. No. 5,972,661.
Continuations (3)
|
Number |
Date |
Country |
Parent |
10244349 |
Sep 2002 |
US |
Child |
10818308 |
Apr 2004 |
US |
Parent |
09358502 |
Jul 1999 |
US |
Child |
09895418 |
Jul 2001 |
US |
Parent |
09162088 |
Sep 1998 |
US |
Child |
09358502 |
Jul 1999 |
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09895418 |
Jul 2001 |
US |
Child |
10244349 |
Sep 2002 |
US |