Electric fan and vacuum cleaner having same

Patent metadata

Field	Value
Publication number	US-11116367-B2
Application number	US-201816233116-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Mar 13, 2017
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

An electric fan and a vacuum cleaner having the same are provided. The electric fan includes: a cover having an open side; an impeller disposed in the cover; a diffuser including a diffuser body and a plurality of vanes, the diffuser body being located at a side of the impeller adjacent to the cover, the plurality of vanes being disposed at an end of the diffuser body adjacent to impeller and spaced apart from one another along an outer circumference of the impeller, an outlet angle of each vane being denoted as β, and β satisfying: 45°≤β≤90°; and a refluxer disposed at an end of the diffuser body away from the impeller. The electric fan reduces flow losses of airflow, and improves work efficiency.

First claim

What is claimed is:

1. An electric fan, comprising:
a cover having an open side;
an impeller disposed in the cover;
a diffuser comprising a diffuser body and a plurality of vanes, the diffuser body being located at a side of the impeller adjacent to the cover, the plurality of vanes being disposed at an end of the diffuser body adjacent to the impeller and spaced apart from one another along an outer circumference of the impeller, an outlet angle of each vane being denoted as β, and the β satisfying: 45°≤β≤90′; and
a refluxer disposed at an end of the diffuser body away from the impeller;
wherein the refluxer is disposed at an outer circumference of the diffuser body and is spaced apart from the diffuser body to define a refluxer flow passage;
wherein a cross-sectional area of the refluxer flow passage remains constant in a direction from the inlet of the refluxer flow passage to the outlet of the refluxer flow passage; or the cross-sectional area of the refluxer flow passage uniformly increases in the direction from the inlet of the refluxer flow passage to the outlet of the refluxer flow passage.

2. The electric fan according to claim 1 , wherein each vane deviates from a radial direction of the impeller, and each vane protrudes in a direction away from a datum line from inside to outside, and the datum line is a connection line of an end of the vane adjacent to a center of the impeller and the center of the impeller.

3. The electric fan according to claim 1 , wherein two adjacent vanes define a diffuser flow passage there between, a diffusion degree of the diffuser flow passage is denoted as Δ 1 , and the Δ 1 satisfies:

Δ
1

=

2
⁢
arctan
⁢

A
2

⁢

/

⁢
π

-

A
1

⁢

/

⁢
π

L
1

<

14
⁢
°

,

in which A 1 is a cross-sectional area at an inlet of the diffuser flow passage, A 2 is a cross-sectional area at an outlet of the diffuser flow passage, and L 1 is a length of the diffuser flow passage.

4. The electric fan according to claim 3 , wherein a cross-sectional area of the diffuser flow passage linearly increases in a direction from the inlet of the diffuser flow passage to the outlet of the diffuser flow passage; or
the diffuser flow passage comprises a first flow passage and a second flow passage sequentially connected in the direction from the inlet of the diffuser flow passage to the outlet of the diffuser flow passage, a cross-sectional area of the first flow passage linearly increases, and an increase rate of a cross-sectional area of the second flow passage is less than an increase rate of the cross-sectional area of the first flow passage.

5. The electric fan according to claim 1 , wherein a thickness of an end of each vane adjacent to a center of the impeller is less than a thickness of an end of the vane away from the center of the impeller.

6. The electric fan according to claim 1 , wherein an end of each vane away from a center of the impeller extends out of an outer circumferential wall of the diffuser body.

7. The electric fan according to claim 1 , wherein a diffusion degree of the refluxer flow passage is denoted as Δ 2 , and the Δ 2 satisfies:

Δ
2

=

2
⁢
arctan
⁢

A
4

⁢

/

⁢
π

-

A
3

⁢

/

⁢
π

L
2

<

14
⁢
°

,

in which A 3 is a cross-sectional area at an inlet of the refluxer flow passage, A 4 is a cross-sectional area at an outlet of the refluxer flow passage, and L 2 is a length of the refluxer flow passage.

8. The electric fan according to claim 1 , wherein a side of the refluxer away from the impeller is provided with an electric motor, and the outlet of the refluxer flow passage faces the electric motor.

9. The electric fan according to claim 8 , wherein the refluxer flow passage obliquely extends along an axial direction of the impeller, from the inlet of the refluxer flow passage to the outlet of the refluxer flow passage and in a direction approaching a central axis of the impeller.

10. The electric fan according to claim 1 , wherein one of the diffuser body and the refluxer is provided with at least one fitting protrusion, and the other one of the diffuser body and the refluxer defines at least one assembling groove fitted with the fitting protrusion.

11. The electric fan according to claim 1 , wherein the cover defines a through air inlet, the air inlet is circular, a diameter of the air inlet is denoted as d, and d satisfies: d≥40 mm.

12. A vacuum cleaner comprising:
an electric fan, comprising:
a cover having an open side;
an impeller disposed in the cover;
a diffuser comprising a diffuser body and a plurality of vanes, the diffuser body being located at a side of the imp

Assignees

• Midea Group Co Ltd

Inventors

• Ming Lele
• Hu Xiaowen
• Zhang Hui
• Han Xiaoyin

Classifications

• F04D29/5806 Primary

  Cooling the drive system · CPC title

• F04D29/4253

  with axial entry and discharge · CPC title

• F04D29/667

  by influencing the flow pattern, e.g. suppression of turbulence · CPC title

• F04D17/165

  Axial entry and discharge · CPC title

• A47L9/2842

  Suction motors or blowers · CPC title