Centrifugal fan

Patent metadata

Field	Value
Publication number	US-10962017-B2
Application number	US-201916267563-A
Country	US
Kind code	B2
Filing date	Feb 5, 2019
Priority date	Feb 26, 2018
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A centrifugal fan includes a motor, a support body, a rotating body, and a housing. The motor includes a rotor hub that rotates around a central axis extending up and down. The support body is fixed to the rotor hub and rotates together with the rotor hub. The rotating body is different from the support body in material. The rotating body is a continuous porous body. The housing accommodates the rotating body, the support body, and the motor. The housing includes an air inlet open in an axial direction and at least one air outlet open in a radial direction. A radially inner surface of the rotating body opposes a radially outer surface of the rotor hub with a gap interposed therebetween.

First claim

What is claimed is:

1. A centrifugal fan comprising:
a motor including a rotor hub rotatable about a central axis extending up and down;
a support body fixed to the rotor hub and rotatable together with the rotor hub;
a rotating body made of a material different from a material of the support body and defined by a continuous porous body; and
a housing to house the rotating body, the support body, and the motor; wherein
the housing includes a first air inlet open in an axial direction and at least one air outlet open in a radial direction;
a radially inner surface of the rotating body opposes a radially outer surface of the rotor hub with a gap interposed therebetween; and
an average pore diameter of the rotating body differs between a side of the radially inner surface of the rotating body and a side of a radially outer surface of the rotating body.

2. The centrifugal fan according to claim 1 , wherein an outer diameter of the rotating body is larger than an outer diameter of the support body.

3. The centrifugal fan according to claim 1 , wherein an inner diameter of the rotating body is three-quarters of an outer diameter of the rotating body or larger.

4. The centrifugal fan according to claim 1 , wherein
the support body includes a plurality of through-holes penetrating in the axial direction and a rib portion positioned between the through-holes adjacent to each other; and
at least one of the plurality of through-holes includes at least a portion open in the gap between the radially inner surface of the rotating body and the radially outer surface of the rotor hub.

5. The centrifugal fan according to claim 4 , wherein
the housing includes an upper wall portion and a lower wall portion opposing each other in the axial direction;
the upper wall portion includes the first air inlet; and
the lower wall portion includes a second air inlet that is open in the axial direction.

6. The centrifugal fan according to claim 5 , wherein the rotating body is located on a surface of the support body opposing the upper wall portion in the axial direction.

7. The centrifugal fan according to claim 1 , wherein an inner diameter of the rotating body is larger than an opening diameter of the first air inlet.

8. The centrifugal fan according to claim 1 , wherein a surface of the rotating body on a side of the first air inlet is hardened by heat or a chemical liquid.

9. The centrifugal fan according to claim 1 , wherein a surface of the rotating body on a side of the support body is hardened by heat or a chemical liquid.

10. The centrifugal fan according to claim 1 , wherein the radially inner surface of the rotating body is parallel or substantially parallel to the central axis.

11. The centrifugal fan according to claim 1 , wherein a radially outer surface of the rotating body is parallel or substantially parallel to the central axis.

12. The centrifugal fan according to claim 1 , wherein a width of the rotating body in the radial direction is constant.

13. The centrifugal fan according to claim 1 , wherein a thickness of the rotating body in the axial direction is constant.

14. The centrifugal fan according to claim 1 , wherein the average pore diameter on the side of the radially inner surface of the rotating body is larger than the average pore diameter on the side of the radially outer surface of the rotating body.

15. The centrifugal fan according to claim 1 , wherein a material of the rotating body includes an open-cell structure.

Assignees

• Nidec Corp

Inventors

• Tsukamoto Tomoyuki
• Fukushima Kazuhiko

Classifications

• F04D29/288

  Part of the wheel having an ejecting effect, e.g. being bladeless diffuser · CPC title

• F04D29/023

  especially adapted for elastic fluid pumps · CPC title

• F05D2300/612

  Foam · CPC title

• F04D29/4226

  Fan casings · CPC title

• F04D25/0606

  the electric motor being specially adapted for integration in the pump · CPC title