# US 2025/0092876 A1 · Air moving devices, aerodynamic rotor, and methods

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- Number: US 2025/0092876 A1
- Document ID: US20250092876A1
- Status: Published application
- Kind: A1
- Application number: 18/891,746
- Filed: 2024-09-20
- Published: 2025-03-20
- Earliest claimed: 2023-09-20
- Assignees: Whisper Aero Inc.
- Applicants: Whisper Aero Inc.
- Inventors: Mark Douglass Moore; Ian Andreas Villa; Devon Jedamski; Xiaofan Fei; Andrew George Terajewicz; Jonathan Jeffrey Paravano; Andrew Michael Marschner; Matthew Alan Dempsey
- Web page: https://patentgrep.com/patent/US20250092876A1

## CPC

- F04D 19/002: {Axial flow fans}
- F04D 25/16: Combinations of two or more pumps {; Producing two or more separate gas flows}
- A01G 20/47: Vacuum or blower devices
- F04D 19/022: {with concentric rows of vanes;}
- F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence)
- F04D 25/08: the working fluid being air, e.g. for ventilation
- F04D 25/084: {hand fans}
- F04D 25/10: the unit having provisions for automatically changing direction of output air
- F04D 25/166: {using fans}
- F04D 27/002: {by varying geometry within the pumps, e.g. by adjusting vanes}
- F04D 27/003: {by throttling (F04D27/002 takes precedence)}
- F04D 27/004: {by varying driving speed}
- F04D 27/007: {Conjoint control of two or more different functions}
- F04D 29/32: for axial flow pumps
- F04D 29/325: {for axial flow fans (blade mountings F04D29/34, blades F04D29/38)}
- F04D 29/326: {comprising a rotating shroud}
- F04D 29/384: {characterised by form}
- F04D 29/545: {Ducts}
- F05D 2220/327: to drive shrouded, high solidity propeller
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

An air-moving device may include an aerodynamic rotor in the form of a bladed disk. The aerodynamic rotor may include a physical geometry that constrains a noise level of the air-moving device.

## Claims

### Claim 1

A method of moving air comprising:
providing an air-moving device comprising:
a motor;
a drive mechanism coupled to the motor; and
a rotor coupled to the drive mechanism, the rotor axially placed within a duct and comprising:
a hub;
a quantity of blades contiguously formed with and radially extend away from the hub, wherein the quantity of blades is in the range of 12-100 blades and the blades each have a blade aspect ratio between 1 and 10; and
a shroud contiguously formed with and circumscribing the quantity of blades; and
causing, via operation of the motor, the rotor to rotate with a blade passage frequency (BPF) in the range of approximately 8-16 kilohertz (kHz) to create a fan pressure ratio in the range of approximately 1.01-1.2, such that the rotation of the rotor results in a noise level of the air-moving device in the range of approximately 30-70 A-weighted decibels dB (A) at distance of at 50 feet.

### Claim 2 (depends on 1)

The method of claim 1, wherein an outermost diameter of the rotor is in the range of approximately 65-122 millimeters.

### Claim 3 (depends on 1)

The method of claim 1, wherein the blade aspect ratio is in the range of approximately 2-10.

### Claim 4 (depends on 1)

The method of claim 1, wherein the rotating of the rotor further results in an exit jet velocity in the range of approximately 90-290 miles per hour (mph).

### Claim 5 (depends on 1)

The method of claim 1, wherein the rotating of the rotor further results in a volumetric air flow in the range of approximately 500-1,100 cubic feet per minute (cfm).

### Claim 6 (depends on 1)

The method of claim 1, wherein the BPF is in the range of approximately 10-13 kHz.

### Claim 7 (depends on 1)

The method of claim 1, wherein the rotating of the rotor further results a blade tip speed in the range of approximately 200-550 feet per second (ft/s).

### Claim 8 (depends on 7)

The method of claim 7, wherein the blade tip speed is in the range of approximately 300-450 ft/s.

### Claim 9 (depends on 1)

The method of claim 1, wherein rotation of the rotor results in a noise level of the air-moving device in the range of approximately 30-60 dB (A).

### Claim 10 (depends on 1)

The method of claim 1, wherein rotation of the rotor results in a noise level of the air-moving device in the range of approximately 30-55 dB (A).

### Claim 11 (depends on 1)

The method of claim 1, wherein the quantity of the blades is in the range of 20-50 blades.

### Claim 12 (depends on 1)

The method of claim 1, wherein the quantity of the blades is in the range of 16-45 blades.

### Claim 13 (depends on 1)

The method of claim 1, wherein the quantity of the blades is in the range of 20-24 blades.

### Claim 14

An apparatus configured to move air through an air-moving device,
a rotor configured to be axially rotated within a duct, the rotor comprising:
a central hub;
a quantity of blades between 12-100 blades, wherein each blade has a proximate end that is contiguously formed with the hub of the rotor and radially extends away from the hub to terminate at a terminal end, and wherein each blade has a blade aspect ratio between 1 and 10; and
a shroud contiguously formed with and circumscribing the terminal ends of the blades;
wherein the rotor is configured to rotate with a blade passage frequency (BPF) in the range of approximately 8-16 kilohertz (kHz) to create thrust.

### Claim 15 (depends on 14)

The apparatus of claim 14, wherein each blade has a blade aspect ratio between 2 and 10.

### Claim 16 (depends on 14)

The apparatus of claim 14, wherein the quantity of the blades in is the range of 20-50 blades.

### Claim 17 (depends on 14)

The apparatus of claim 14, wherein the rotor has a circumferential blade spacing in the range of approximately-17-1 mm.

### Claim 18 (depends on 14)

The apparatus of claim 14, wherein an outer most diameter of the rotor is in the range of approximately 78-150 mm.

### Claim 19

An apparatus configured to move air through an air-moving device,
a rotor comprising:
a central hub configured to be axially rotated;
a quantity of blades between 12-100 blades, wherein each blade has a proximate end that is contiguously formed with the hub of the rotor and radially extends away from the hub to terminate at a terminal end, and wherein each blade has a blade aspect ratio between 1 and 10; and
a shroud contiguously formed with and circumscribing the terminal ends of the blades;
a housing that defines a primary airpath between an inlet end and an outlet end;
wherein the rotor is configured to be axially rotated within the housing at a blade passage frequency (BPF) in the range of approximately 8-16 kilohertz (kHz) and fan pressure ratio within the range of approximately 1.01-1.2 to create thrust.

### Claim 20 (depends on 19)

The apparatus of claim 19, wherein the apparatus is configured such that upon the rotor being axially rotated, the terminal end of the blades are congruent with an adjacent outer perimeter of the primary air path defined by the housing.

### Claim 21 (depends on 20)

The apparatus of claim 20, wherein the apparatus is configured such that a noise level from the apparatus does not exceed, during rotation of the rotor, approximately 30-70 A-weighted decibels dB (A) at distance of at 50 feet.

### Claim 22 (depends on 21)

The apparatus of claim 21, wherein the rotation causes the air-moving device to generate a fan pressure ratio of approximately 1.01-1.1.

### Claim 23 (depends on 22)

The apparatus of claim 22, wherein the rotation causes the air-moving device to generate an exit jet velocity in the range of approximately 90-290 miles per hour.

### Claim 24 (depends on 23)

The apparatus of claim 23, wherein the rotation causes the air-moving device to generate a volumetric air flow in the range of approximately 500-1,100 cubic feet per minute (cfm).