# US 10,309,667 B2 · Ventilator

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- Number: US 10,309,667 B2
- Document ID: US10309667B2
- Status: Granted
- Kind: B2
- Application number: 14/906,015
- Filed: 2014-07-18
- Published: 2016-06-09
- Granted: 2019-06-04
- Earliest claimed: 2013-07-19
- Assignees: Nanyang Technological University
- Applicants: Nanyang Technological University
- Inventors: Fook Hoong Choo; Mohan Dass Ettanoor Thuppale
- Web page: https://patentgrep.com/patent/US10309667B2

## CPC

- F24F 7/08: with separate ducts for supplied and exhausted air {with provisions for reversal of the input and output systems}
- F04D 17/16: for displacing without appreciable compression
- F04D 25/08: the working fluid being air, e.g. for ventilation
- F04D 25/088: {Ceiling fans}
- F24F 2221/14: mounted on the ceiling
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A ventilator comprising an air blower; a casing comprising a first wall and a second wall configured to house the air blower centrally and to define a radially decreasing volume therebetween, a circumferential gap between the first wall and the second wall configured to allow a high velocity air stream to exit and to spiral in a direction away from a structure to which the ventilator is configured to be mounted, and a central opening in the second wall configured as a suction inlet of the air blower; and a flow amplifier adjacent the casing and configured to amplify air flow through an air flow passage defined between the flow amplifier and the second wall of the casing.

## Claims

### Claim 1

A ventilator comprising:
an air blower;
a casing comprising
a first wall and a second wall configured to house the air blower centrally and to define a radially decreasing volume therebetween,
a circumferential gap between the first wall and the second wall configured to allow a high velocity air stream to exit and to spiral in a direction away from a structure to which the ventilator is configured to be mounted, and
a central opening in the second wall configured as a suction inlet of the air blower; and
a flow amplifier adjacent the casing, the flow amplifier comprising a flow amplifying wall provided in parallel with the second wall of the casing and is configured to amplify air flow through an air flow passage defined between the flow amplifying wall and the second wall of the casing.

### Claim 2 (depends on 1)

The ventilator of claim 1, wherein the air flow passage has a constant flow cross section.

### Claim 3 (depends on 1)

The ventilator of claim 1, wherein the first wall has a greater diameter than the second wall.

### Claim 4 (depends on 1)

The ventilator of claim 1, wherein the flow amplifier is configured to mingle amplified air exiting the air flow passage with the high velocity air stream exiting the circumferential gap.

### Claim 5 (depends on 1)

The ventilator of claim 1, wherein the high velocity air stream has vorticity and direction controllable by a speed of the blower.

### Claim 6 (depends on 1)

The ventilator of claim 1, wherein, during operation, air is drawn towards the suction inlet of the blower along a central axis of the ventilator.

### Claim 7 (depends on 1)

The ventilator of claim 1, wherein the first wall is configured for mounting the ventilator to the structure, the structure being at least one of: a ceiling, a wall and a stand.

### Claim 8 (depends on 1)

The ventilator of claim 1, wherein the first wall, the second wall and the flow amplifying wall are circular.

### Claim 9 (depends on 8)

The ventilator of claim 8, wherein the flow amplifying wall forms a constricted section with the first wall.

### Claim 10 (depends on 8)

The ventilator of claim 8, wherein, when the ventilator is oriented such that the first wall is above the second wall, an outer annulus of the first wall slopes downwardly in the radial direction and an outer annulus of the second wall slopes upwardly in the radial direction.