# US 12,215,877 B2 · Air circulation device

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- Number: US 12,215,877 B2
- Document ID: US12215877B2
- Status: Granted
- Kind: B2
- Application number: 17/696,719
- Filed: 2022-03-16
- Published: 2022-06-30
- Granted: 2025-02-04
- Earliest claimed: 2020-09-28
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Masafumi Uda; Yousuke Imai; Keita Kawahara; Kiichirou Satou
- Web page: https://patentgrep.com/patent/US12215877B2

## CPC

- F24F 7/06: with forced air circulation, e.g. by fan {positioning of a ventilator in or against a conduit}
- F24F 11/0001: {for ventilation (F24F11/30 takes precedence)}
- F24F 1/0011: characterised by air outlets
- F24F 7/007: with forced flow (using ducting systems F24F7/06)
- F24F 11/65: for selecting an operating mode
- F24F 11/74: for controlling air flow rate or air velocity
- F24F 13/06: Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
- F24F 2120/12: Position of occupants
- F24F 2221/17: mounted in a wall
- Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
- 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)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

An air circulation device includes a suction section configured to suck indoor air, and a blower section configured to blow the air sucked by the suction section into a room. The air is in a form of a vortex ring. The air circulation device is operable in at least a first mode in which the vortex ring blown therefrom reaches a wall surface of the room.

## Claims

### Claim 1

An air circulation device comprising:
a suction section configured to suck indoor air; and
a blower section configured to blow the air sucked by the suction section into a room, the air being in a form of a vortex ring,
the air circulation device being operable in at least a first mode in which the vortex ring blown from the air circulation device reaches a wall surface of the room and air of the vortex ring, having reached the wall surface and collapsed, being pushed back toward the suction section, wherein
the vortex ring is blown through an outlet into the room,
the air circulation device further includes a damper configured to close a portion of an air passage connecting the blower section to the outlet, and
the damper is further configured to move to a position in which the damper blocks air traveling from the suction section toward the blower section.

### Claim 2 (depends on 1)

The air circulation device of claim 1, wherein
the blower section is configured to be capable of changing at least one of
a volume of the vortex ring at a time of generation of the vortex ring and
a generation frequency of the vortex ring.

### Claim 3 (depends on 2)

The air circulation device of claim 2, wherein
the air circulation device is operable in a second mode in which the vortex ring blown from the air circulation device disappears before reaching the wall surface of the room.

### Claim 4 (depends on 3)

The air circulation device of claim 3, further comprising:
a person detector configured to detect a position of a person,
the air circulation device being operable in a third mode in which the vortex ring is blown toward the person detected by the person detector.

### Claim 5 (depends on 2)

The air circulation device of claim 2, further comprising:
a person detector configured to detect a position of a person,
the air circulation device being operable in a third mode in which the vortex ring is blown toward the person detected by the person detector.

### Claim 6 (depends on 1)

The air circulation device of claim 1, wherein
the air circulation device is operable in a second mode in which the vortex ring blown from the air circulation device disappears before reaching the wall surface of the room.

### Claim 7 (depends on 6)

The air circulation device of claim 6, further comprising:
a person detector configured to detect a position of a person,
the air circulation device being operable in a third mode in which the vortex ring is blown toward the person detected by the person detector.

### Claim 8 (depends on 1)

The air circulation device of claim 1, further comprising:
a person detector configured to detect a position of a person,
the air circulation device being operable in a third mode in which the vortex ring is blown toward the person detected by the person detector.