Mixed-flow fan

Patent metadata

Field	Value
Publication number	US-11053946-B2
Application number	US-201916251937-A
Country	US
Kind code	B2
Filing date	Jan 18, 2019
Priority date	Sep 14, 2017
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

A mixed flow fan includes a bottom base, an outer cover disposed on the bottom base, a motor disposed on the base, and a hub located between the outer case and the motor. The hub includes a first outer surface and a second outer surface connected to the first outer surface and inclined relative to the first outer surface. The slope of the first outer surface relative to the central axis is greater than the slope of the second outer surface relative to the central axis. The base includes a side surface adjacent to the second outer surface. The slope of the side surface relative to the central axis is equal to the slope of the second outer surface relative to the central axis.

First claim

What is claimed is:

1. A mixed-flow fan, comprising:
a base;
an outer cover disposed on the base;
a motor disposed on the base, and located in the outer cover;
a hub located between the outer cover and the motor, wherein the hub is configured to rotate about a central axis, wherein the hub comprises a first outer surface and a second outer surface connected to the first outer surface and inclined relative to the first outer surface, and a slope of the first outer surface relative to the central axis is greater than a slope of the second outer surface relative to the central axis; and
a blade connected to the first outer surface and the second outer surface;
wherein the base comprises a first side surface adjacent to the second outer surface, and a slope of the first side surface relative to the central axis is equal to the slope of the second outer surface relative to the central axis.

2. The mixed-flow fan as claimed in claim 1 , wherein an area of the first outer surface is from 2 times to 10 times an area of the second outer surface.

3. The mixed-flow fan as claimed in claim 1 , wherein the blade further comprises a first edge and a second edge connected to the first edge and inclined relative to the first edge, and a slope of the first edge relative to the central axis is greater than a slope of the second edge relative to the central axis.

4. The mixed-flow fan as claimed in claim 3 , wherein the second edge is closer to the base than the first edge, and the first edge has a length that is 2 times greater than a length of the second edge.

5. The mixed-flow, fan as claimed in claim 1 , wherein the outer cover comprises a first inner surface facing the first outer surface and a second inner surface facing the second outer surface, and a slope of the first inner surface relative to the central axis is greater than a slope of the second inner surface relative to the central axis.

6. The mixed-flow fan as claimed in claim 5 , wherein the first outer surface is a concave surface, and the first inner surface is a convex surface.

7. The mixed-flow fan as claimed in claim 1 , wherein the blade is a wing-shaped structure, and the blade has a various thickness.

8. The mixed-flow fan as claimed in claim 1 , wherein the base comprises a bottom channel, and a main channel is formed between the outer cover and the hub and connected to the bottom channel, wherein the main channel substantially extends in a first direction, the bottom channel substantially extends in a second direction, and a first interior angle between the first direction and the central axis is greater than a second interior angle between the second direction and the central axis.

9. A mixed-flow fan, comprising:
a base;
an outer cover disposed on the base;
a motor disposed on the base, and located in the outer cover; and
a hub located between the outer cover and the motor, wherein the hub is configured to rotate about a central axis, wherein the hub comprises a first outer surface and a second outer surface connected to the first outer surface and inclined relative to the first outer surface, and a slope of the first outer surface relative to the central axis is greater than a slope of the second outer surface relative to the central axis;
wherein the base comprises a first side surface adjacent to the second outer surface, and a slope of the first side surface relative to the central axis is equal to the slope of the second outer surface relative to the central axis;
wherein the base further comprises a bottom channel, and a main channel is formed between the outer cover and the hub and connected to the bottom channel, wherein the main channel substantially extends in a first direction, the bottom channel substantially extends in a second direction, and a first interior angle between the first direction and the central axis is greater than a second interior angle between the second direction and the central axis.

10. The mixed-flow fan as claimed in claim 9 , wherein the main channel comprises a main inlet and a main outlet opposite to the main inlet, and the main outlet is connected to the bottom channel;
wherein the main channel gradually narrows from the main inlet to the main outlet.

11. The mixed-flow fan as claimed in claim 10 , wherein the main inlet and the main outlet are ring-shaped.

12. The mixed-flow fan as claimed in claim 9 , wherein the first interior angle is greater than 20 degrees, and the second interior angle is less than 15 degrees.

13. The mixed-flow fan as claimed in claim 9 , wherein the base comprises:
a first base body, wherein the motor is disposed on the first base body;
a second base body surrounding the first base body, and separated from the first base body; and
a support rib connected to the first base body and the second base body,
wherein the bottom channel is formed between the first base body and the second base body, and the support rib is located in the bottom channel.

14. The mixed-flow fan as claimed in claim 13 , further comprising a circuit board connected to the motor, wherein the first base body comprises a receiving groove, and the circuit hoard is located in the receiving groove.

15. The mixed-flow fan as claimed in claim 14 , wherein the mixed-flow fan has a thickness that is less than 10 times a depth of the receiving groove, and the depth and the thickness are measured in a longitudinal direction parallel to the central axis.

16. The mixed-flow fan as claimed in claim 13 , wherein the first base body has a diameter that is 1.6 times greater than a diameter of the motor, and the diameter of the first base body and the diameter of the motor are measured in a transversal direction perpendicular to the central axis.

17. The mixed-flow fan as claimed in claim 13 , wherein the first base body comprises the first side surface, the second base body comprises a second side surface facing the first side surface, and the bottom channel is formed between the first side surface and the second base surface; and
wherein a first angle between an extension direction of the first side surface and the central axis is less than or equal to a second angle between an extension direction of the second side surface and the central axis.

18. The mixed-flow fan as claimed in claim 17 , wherein the second base body is a ring structure perpendicular to the central axis.

19. A mixed-flow fan, comprising:
a base;
an outer cover disposed on the base;
a motor disposed on the base, and located in the outer cover;
a hub located between the outer cover and the motor, wherein the hub is configured to rotate about a central axis, and comprises an outer surface; and
a blade connected to the outer surface;
wherein the base comprises a first side surface adjacent to the outer surface, and a slope of the outer surface relative to the central axis is greater than a slope of the first side surface relative to the central axis;
wherein the blade further comprises a first edge and a second edge connected to the first edge and inclined relative to the first edge, and a slope of the first edge relative to the central axis is greater than a slope of the second edge relative to the central axis;
wherein the second edge is closer to the base than the first edge, and a length of the first edge is more than 2 times longer than a length of the second edge.

20. The mixed-flow fan as claimed in claim 19 , wherein the base further comprises a second side surface facing the first side surface, and the second side surface is inclined rel

Assignees

• Delta Electronics Inc

Inventors

• Chang Shun-Chen
• Chen Shih-Di
• Yang Chao-Fu

Classifications

• F04D17/06 Primary

  Helico-centrifugal pumps · CPC title

• F04D25/0613

  the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator · CPC title

• F04D29/526

  Details of the casing section radially opposing blade tips (ducts F04D29/545) · CPC title

• F04D19/002 Primary

  Axial flow fans · CPC title

• F04D25/08

  the working fluid being air, e.g. for ventilation · CPC title