Centrifugal impeller

Abstract

A centrifugal impeller employed in a centrifugal machine, includes a main body, the main body generally being conical and defining a shaft bore in a center portion thereof; and a plurality of blade groups evenly arranged surrounding the shaft bore in sequence, each of the blade groups having a plurality of blades wherein neighboring blades having an interval angle, and the number and corresponding interval angles of the blades of different blade groups are identical. The present impeller structure can be employed to distribute the concentrated energy of the discrete tones noise of the blades, which is generated by the high-speed rotation impeller, and further to reduce the operating tones noise.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of conventional centrifugal machine;

FIGS. 2A and 2B are two schematic view of a structure of the centrifugal shown in FIG. 1;

FIG. 3 is a noise spectrum diagram of the centrifugal machine shown in FIG. 1;

FIG. 4 is a section view of the centrifugal machine of U.S. Pat. No. 3,635,579;

FIG. 5 is a section view of the centrifugal machine of U.S. Pat. No. 4,411,592;

FIGS. 6A and 6B are two schematic views of the centrifugal impeller in accordance with a preferred embodiment of the present invention;

FIG. 7 is a noise spectrum of the centrifugal machine shown in FIG. 6A and FIG. 6B;

FIG. 8 is a schematic view of the centrifugal impeller in accordance with a second embodiment of the present invention;

FIG. 9 is a schematic view of the centrifugal impeller in accordance with a third embodiment of the present invention; and

FIGS. 10A and 10B are two schematic views of the centrifugal impeller in accordance with a fourth embodiment of the present invention.

Claims

1. A centrifugal impeller employed in a centrifugal machine, the centrifugal impeller comprising: a main body, the main body generally being conical and defining a shaft bore in a center portion thereof; anda plurality of blade groups evenly arranged surrounding the shaft bore in sequence, each of the blade groups having a plurality of blades wherein neighboring blades having an interval angle.

2. The centrifugal impeller as claimed in claim 1, wherein the number of the blades of different blade groups is identical.

3. The centrifugal impeller as claimed in claim 1, wherein the corresponding interval angles of the blades of different blade groups are identical.

4. The centrifugal impeller as claimed in claim 1, wherein the centrifugal impeller is a regular periodically changed impeller structure whose blades have different interval angles.

5. The centrifugal impeller as claimed in claim 1, wherein the neighboring blades of each of the blade groups have different interval angle means that the interval angle of the neighboring blades has an increment angle.

6. The centrifugal impeller as claimed in claim 1, wherein the neighboring blades of each of the blade groups have different interval angle means that the interval angle of the neighboring blades has different angle increases.

7. The centrifugal impeller as claimed in claim 1, wherein the centrifugal impeller has two blade groups, the blades of the two blade groups are 180 degree symmetrical to each other.

8. The centrifugal impeller as claimed in claim 1, wherein the centrifugal impeller has three blade groups, the blades of the three blade groups are 120 degree symmetrical to one another.

9. The centrifugal impeller as claimed in claim 1, wherein the centrifugal impeller has four blade groups, the blades of the four blade groups are 90 degree symmetrical to one another.

10. The centrifugal impeller as claimed in claim 1, wherein each of the blades is approximately perpendicular to the plane where the main body locates.

11. The centrifugal impeller as claimed in claim 1, wherein the main body is circular.

12. A centrifugal impeller employed in a centrifugal machine, comprising: a main body defining a shaft bore in a center portion thereof;a plurality of blades arranged surrounding the shaft bore in sequence, neighboring blades have different interval angles; anda center of mass adjusting unit arranged on the main body for adjusting the center of mass of the centrifugal impeller to the rotation axis of the impeller.

13. The centrifugal impeller as claimed in claim 12, wherein the neighboring blades have different interval angle means that the interval angle of the neighboring blades has an increment angle.

14. The centrifugal impeller as claimed in claim 12, wherein the neighboring blades have different interval angle means that the interval angle of the neighboring blades has different angle increases.

15. The centrifugal impeller as claimed in claim 12, wherein the center of mass adjusting unit is a mass block.

16. The centrifugal impeller as claimed in claim 12, wherein the center of mass adjusting unit is arrange on the main body where the blades are not arranged.

17. The centrifugal impeller as claimed in claim 12, wherein the center of mass adjusting unit is arranged on the edge of the main body.

18. The centrifugal impeller as claimed in claim 12, wherein each of the blades is approximately perpendicular to the plane where the main body locates.

19. The centrifugal impeller as claimed in claim 12, wherein the main body is circular.

20. The centrifugal impeller as claimed in claim 12, wherein the configuration of the position of the center of mass ad the blades is related to the mass of the center of mass adjusting unit.