Impeller and fan

Patent metadata

Field	Value
Publication number	US-11236760-B2
Application number	US-201916710739-A
Country	US
Kind code	B2
Filing date	Dec 11, 2019
Priority date	Dec 11, 2015
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

An impeller includes a hub and blades. In radial direction, an upper surface of the blade near the outer edge includes a groove structure, a lower surface of the blade relating to the groove structure includes a peak structure, the lower surface of the blade includes a recess structure aside the trailing edge or the leading edge. The recess structure is connected to the peak structure. The blade has at least five airfoils from the inner edge to the outer edge. The blade is defined by continuously connecting the at least five airfoils at different sections in sequence so as to form the groove structure and the peak structure respectively on the upper surface and the lower surface. The groove structure and the peak structure are aside the outer edge of the blade.

First claim

What is claimed is:

1. An impeller, comprising:
a hub, including a shaft; and
a plurality of blades surrounding the hub, wherein each blade includes a leading edge, an outer edge, a middle portion and a trailing edge in the rotation direction of the impeller, wherein the leading edge, the outer edge and the trailing edge are around three sides of the middle portion, wherein in radial direction, an upper surface of the blade near the outer edge includes a groove structure, a lower surface of the blade relating to the groove structure includes a peak structure, the lower surface of the blade includes a recess structure aside the trailing edge or the leading edge, the recess structure is connected to the peak structure;
wherein the blade has at least five airfoils from the inner edge to the outer edge, the blade is defined by continuously connecting the at least five airfoils at different sections in sequence so as to form the groove structure and the peak structure respectively on the upper surface and the lower surface, the groove structure and the peak structure are aside the outer edge of the blade, a depth of the groove structure varies from the leading edge to the trailing edge, a height of the peak structure varies from the leading edge to the trailing edge, and variations of the groove structure and the peak structure are continuous and gradual on the upper surface and the lower surface.

2. The impeller as recited in claim 1 , wherein the recess structure is connected to the outer edge.

3. The impeller as recited in claim 1 , wherein the recess structure is connected to the trailing edge or the leading edge.

4. The impeller as recited in claim 1 , wherein the lower surface has a zone from the trailing edge toward the leading edge to a recess border, a ratio of a distance between the recess border and the trailing edge to a distance between the recess border and the leading edge is smaller than 1/2, the recess structure is within the zone aside the trailing edge and is not beyond the recess border.

5. The impeller as recited in claim 1 , wherein the lower surface has a zone from the leading edge toward the trailing edge to a recess border, a ratio of a distance between the recess border and the leading edge to a distance between the recess border and the trailing edge is smaller than 1/2, the recess structure is within the zone aside the leading edge and is not beyond the recess border.

6. The impeller as recited in claim 1 , wherein an area of the recess structure at the lower surface is smaller than 1/3 of a total area of the lower surface.

7. The impeller as recited in claim 1 , wherein each one of the blades has a forefront point, when viewing the upper surfaces of the blades, a plurality of imaginary lines are from the shaft respectively to the forefront points, every two adjacent imaginary lines define one included angle, the included angles are distinct from each other.

8. The impeller as recited in claim 1 , wherein the groove structure is connected to the leading edge and the trailing edge, and the peak structure is connected to the leading edge and the trailing edge.

9. An impeller, comprising:
a hub, including a shaft; and
a plurality of blades surrounding the hub, wherein each blade includes a leading edge, an outer edge, a middle portion and a trailing edge in the rotation direction of the impeller, wherein the leading edge, the outer edge and the trailing edge are around three sides of the middle portion, wherein in radial direction, an upper surface of the blade near the outer edge includes a groove structure, a lower surface of the blade relating to the groove structure includes a peak structure, the lower surface of the blade includes a recess structure aside the trailing edge or the leading edge, the recess structure is connected to the peak structure, the recess structure is connected to the outer edge, the recess structure is connected to the trailing edge or the leading edge;
wherein the blade has at least five airfoils from the inner edge to the outer edge, the blade is defined by continuously connecting the at least five airfoils at different sections in sequence so as to form the groove structure and the peak structure respectively on the upper surface and the lower surface, the groove structure and the peak structure are aside the outer edge of the blade, a depth of the groove structure varies from the leading edge to the trailing edge, a height of the peak structure varies from the leading edge to the trailing edge, and variations of the groove structure and the peak structure are continuous and gradual on the upper surface and the lower surface.

10. The impeller as recited in claim 9 ,
wherein an area of the recess structure at the lower surface is smaller than 1/3 of a total area of the lower surface;
wherein each one of the blades has a forefront point, when viewing the upper surfaces of the blades, a plurality of imaginary lines are from the shaft respectively to the forefront points, every two adjacent imaginary lines define one included angle, the included angles are distinct from each other;
wherein the groove structure is connected to the leading edge and the trailing edge, and the peak structure is connected to the leading edge and the trailing edge.

11. An impeller, comprising:
a hub, including a shaft; and
a plurality of blades surrounding the hub, wherein each blade includes an inner edge, a leading edge, an outer edge, a middle portion and a trailing edge in the rotation direction of the impeller, wherein the leading edge, the outer edge and the trailing edge are around three sides of the middle portion, wherein in radial direction, an upper surface of the blade near the outer edge includes a groove structure, a lower surface of the blade relating to the groove structure includes a peak structure, the lower surface of the blade includes a recess structure aside the trailing edge or the leading edge;
wherein the blade has at least five airfoils from the inner edge to the outer edge, the blade is defined by continuously connecting the at least five airfoils at different sections in sequence so as to form the groove structure and the peak structure respectively on the upper surface and the lower surface, the groove structure and the peak structure are aside the outer edge of the blade.

12. The impeller as recited in claim 11 , wherein the recess structure is connected to the peak structure.

13. The impeller as recited in claim 11 , wherein the recess structure is connected to the outer edge.

14. The impeller as recited in claim 11 , wherein the recess structure is connected to the trailing edge or the leading edge.

15. The impeller as recited in claim 11 , wherein the lower surface has a zone from the trailing edge toward the leading edge to a recess border, a ratio of a distance between the recess border and the trailing edge to a distance between the recess border and the leading edge is smaller than 1/2, the recess structure is within the zone aside the trailing edge and is not beyond the recess border.

16. The impeller as recited in claim 11 , wherein the lower surface has a zone from the leading edge toward the trailing edge to a recess border, a ratio of a distance between the recess border and the leading edge to a distance between the recess border and the trailing edge is smaller than 1/2, the recess structure is within the zone aside the leading edge and is not beyond the recess border.

17. The impeller as recited in claim 11 , wherein an area of the recess structure at the lower surface is smaller than 1/3 of a total area of the

Assignees

• Delta Electronics Inc

Inventors

• Yang Chao-Fu
• Hung Li-Han
• Huang Jen-Bo
• Chang Shun-Chen
• Hsu Kuo-Tung

Classifications

• F04D29/384 Primary

  characterised by form · CPC title

• F04D29/325

  for axial flow fans (blade mountings F04D29/34, blades F04D29/38) · CPC title

• F05D2240/304

  related to the trailing edge of a rotor blade · CPC title

• F05D2240/301

  Cross-sectional characteristics · CPC title

• F05D2240/306

  related to the suction side of a rotor blade · CPC title