Axial fan

Patent metadata

Field	Value
Publication number	US-11022128-B2
Application number	US-201916402462-A
Country	US
Kind code	B2
Filing date	May 3, 2019
Priority date	Jun 22, 2018
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

An axial fan includes an upper impeller disposed in an axially upper portion of a housing, and an upper circuit board disposed axially below the upper impeller. An upper impeller cup of the upper impeller includes an upper cylindrical portion and an upper lid. The axial fan includes a lower impeller disposed in an axially lower portion of the housing, and a lower circuit board disposed axially above the lower impeller. A lower impeller cup of the lower impeller includes a lower cylindrical portion and a lower lid. An axial upper end outer diameter of the upper cylindrical portion is smaller than an axial lower end outer diameter of the upper cylindrical portion. An axial lower end outer diameter of the lower cylindrical portion is smaller than an axial upper end outer diameter of the lower cylindrical portion.

First claim

What is claimed is:

1. An axial fan comprising:
a housing that extends along a central axis extending vertically, and includes an air inlet at an upper end and an air outlet at a lower end;
an upper impeller that is disposed in an axially upper portion of the housing and rotates about the central axis;
an upper motor that causes the upper impeller to rotate about the central axis;
an upper circuit board that is disposed axially below the upper impeller;
a lower impeller that is disposed in an axially lower portion of the housing and rotates about the central axis;
a lower motor that causes the lower impeller to rotate about the central axis; and
a lower circuit board that is disposed axially above the lower impeller;
the upper impeller including:
an upper impeller cup fixed to the upper motor; and
a plurality of upper blades arranged in a circumferential direction on an outer surface of the upper impeller cup;

the upper impeller cup including:
an upper conical portion opposing the upper motor in a radial direction and extending along the central axis; and
an upper lid extending radially at an axial upper end of the upper conical portion;

the lower impeller including:
a lower impeller cup fixed to the lower motor, and
a plurality of lower blades arranged in the circumferential direction on an outer surface of the lower impeller cup; and

the lower impeller cup includes:
a lower conical portion opposing the lower motor in the radial direction and extending along the central axis; and
a lower lid extending radially at an axial lower end of the lower conical portion; wherein

an axial upper end outer diameter of the upper conical portion is smaller than an axial lower end outer diameter of the upper conical portion;
an axial lower end outer diameter of the lower conical portion is smaller than an axial upper end outer diameter of the lower conical portion;
the axial lower end outer diameter of the lower conical portion is smaller than an axial lower end outer diameter of the upper conical portion; and
an outer diameter of the lower conical portion continuously increases from an axially lowermost end of the lower conical portion to an axially uppermost end of the lower conical portion, the axially uppermost end of the lower conical portion being adjacent to an axially uppermost end of the lower impeller cup in an axial direction.

2. The axial fan according to claim 1 , wherein the upper conical portion includes a first upper inclined portion with an outer diameter increasing toward a lower side in the axial direction.

3. The axial fan according to claim 1 , wherein an axial upper end outer diameter of the lower conical portion is equal to an axial lower end outer diameter of the upper conical portion.

4. The axial fan according to claim 1 , wherein the upper lid includes a second upper inclined portion that has a conical shape extending axially downward toward a radially outer side.

5. The axial fan according to claim 1 , wherein the lower lid includes a second lower inclined portion that has a conical shape extending axially upward toward a radially outer side.

6. The axial fan according to claim 1 , wherein a radially outer end of an axially upper portion of each of the plurality of upper blades curves axially upward toward an upper side in the axial direction.

7. The axial fan according to claim 1 , wherein a radially outer end of an axially lower portion of each of the plurality of upper blades curves axially downward toward a lower side in the axial direction.

8. The axial fan according to claim 1 , wherein a radially outer end of an axially upper portion of each of the plurality of lower blades curves axially upward toward an upper side in the axial direction.

9. The axial fan according to claim 1 , wherein a radially outer end of an axially lower portion of each of the plurality of lower blades curves axially downward toward a lower side in the axial direction.

10. The axial fan according to claim 1 , wherein the upper impeller and the lower impeller are accommodated in an air flow passage.

11. The axial fan according to claim 1 , wherein an outer diameter of the upper circuit board is smaller than an outer diameter of the upper impeller.

12. The axial fan according to claim 1 , wherein an outer diameter of the lower circuit board is smaller than an outer diameter of the lower impeller.

Assignees

• Nidec Corp

Inventors

• Inouchi Kazuhiro
• Matsuyama Junya

Classifications

• F04D29/329

  Details of the hub · CPC title

• F04D25/068

  Mechanical details of the pump control unit (pump control details F04D27/00) · CPC title

• F04D29/666

  by means of rotor construction or layout, e.g. unequal distribution of blades or vanes · CPC title

• F04D19/007 Primary

  multistage fans · CPC title

• F04D29/386

  Skewed blades · CPC title