# US 12,601,361 B2 · Fan impeller structure

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,601,361 B2
- Document ID: US12601361B2
- Status: Granted
- Kind: B2
- Application number: 18/430,341
- Filed: 2024-02-01
- Published: 2025-07-24
- Granted: 2026-04-14
- Earliest claimed: 2024-01-19
- Assignees: Asia Vital Components Co., Ltd.
- Applicants: Asia Vital Components Co., Ltd.
- Inventors: Sung-Wei Sun; Chu-Hsien Chou; Yi-Chih Lin; Pei-Chuan Lee
- Web page: https://patentgrep.com/patent/US12601361B2

## CPC

- F04D 29/325: {for axial flow fans (blade mountings F04D29/34, blades F04D29/38)}
- F04D 19/002: {Axial flow fans}
- F04D 29/384: {characterised by form}
- F04D 29/681: {especially adapted for elastic fluid pumps}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A fan impeller structure includes a hub having a top and a sidewall; and a plurality of blades being circumferentially spaced on the sidewall. Each of the blades has a barrier zone formed at a tip portion of the blade; the barrier zone is used to prevent or block fluid at a lower side of the blade to turn over to an upper side of the blade owing to a difference in the pressure distributed over the upper and the lower side of the blade. Therefore, when a fan using the fan impeller structure is operating, the fan is able to maintain constant air flow and static efficiency to largely reduce vortices formed at the tip portions of the blades (also referred to as wingtip vortices) and accordingly, to reduce the occurrence of aerodynamic noise.

## Claims

### Claim 1

A fan impeller structure comprising:
a hub having a top and a sidewall and
a plurality of blades circumferentially spaced on the sidewall; each of the blades having a root portion at a radially inner end of the blade, the root portion connected to the sidewall and a tip portion at an opposite, radially outer end of the blade, the tip portion forming a barrier zone at a radially outermost edge of the blade, the barrier zone including one continuously inclining lifted section having a first width and one continuously declining declined section having a second width, and wherein the lifted section is discontinuous from the declined section, the root portion having a geometry different from the continuously inclining lifted section having the first width and different from the continuously declining declined section having the second width of the barrier zone and the root portion having a curvature describing a non-linear structure, such that the barrier zone prevents fluid at a lower side of the blade from turning over to an upper side of the blade owing to a difference in the pressure distributed over the upper and the lower side of the tip portion of the blade to thereby enable reduced vortices at the tip portions of the blades and reduced aerodynamic noise.

### Claim 2 (depends on 1)

The fan impeller structure as claimed in claim 1, wherein the first width equal to the second width.

### Claim 3 (depends on 1)

The fan impeller structure as claimed in claim 1, wherein the lifted sections and the declined sections are integrally formed with the respective blades.

### Claim 4 (depends on 1)

The fan impeller structure as claimed in claim 1, wherein the lifted sections and the declined sections are separate and independent components and are connected to the respective blades by a way selected from the group consisting of riveting, snapping, bonding, locking, welding, and fusion welding.

### Claim 5 (depends on 1)

The fan impeller structure as claimed in claim 1, wherein the lifted sections and the declined sections are made of a material the same as that of the blades.

### Claim 6 (depends on 5)

The fan impeller structure as claimed in claim 5, wherein the lifted sections and the declined sections are made of a macromolecular material.

### Claim 7 (depends on 1)

The fan impeller structure as claimed in claim 1, wherein the fan impeller structure is mounted to a fan frame, which has a base provided at one side thereof and a shaft sleeve extended upward from the base; and an outer side of the shaft sleeve having a stator assembly fitted thereon and the hub being correspondingly fitted on around an outer side of the stator assembly.