# US 10,767,874 B2 · Ceiling-embedded air conditioner

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- Number: US 10,767,874 B2
- Document ID: US10767874B2
- Status: Granted
- Kind: B2
- Application number: 14/879,431
- Filed: 2015-10-09
- Published: 2016-04-14
- Granted: 2020-09-08
- Earliest claimed: 2014-10-10
- Assignees: Fujitsu General Limited
- Applicants: Fujitsu General Limited
- Inventors: Kazuaki Yamasari
- Web page: https://patentgrep.com/patent/US10767874B2

## CPC

- F24F 1/0011: characterised by air outlets
- F04D 29/162: {of a centrifugal flow wheel}
- F24F 1/0007: Indoor units, e.g. fan coil units (self-contained units F24F1/02)
- F24F 1/0022: Centrifugal or radial fans
- F24F 1/0025: Cross-flow or tangential fans
- F24F 1/0047: mounted in the ceiling or at the ceiling
- F24F 1/0063: by the mounting or arrangement of the heat exchangers
- F24F 1/0067: by the shape of the heat exchangers or of parts thereof, e.g. of their fins
- F24F 1/0323: by the mounting or arrangement of the heat exchangers
- F24F 1/0325: by the shape of the heat exchangers or of parts thereof, e.g. of their fins
- F24F 2013/205: {Mounting a ventilator fan therein}
- 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 ceiling-embedded air conditioner includes: a ceiling-embedded casing body that has an air suction path at the center of a lower surface and has an air blowoff path around the air suction path; a turbo fan that is disposed inside the casing body; a heat exchanger that is disposed inside the casing body on an outer peripheral side of the turbo fan; a bell-mouth that guides air sucked from the air suction path toward the inside of the turbo fan; and a rectifier that is provided on a back surface side of the bell-mouth at the air suction path side opposite to an air suction surface of the bell-mouth, the rectifier suppressing swirling airflows generated by part of air blown from the turbo fan swirling along the back surface of the bell-mouth in the same direction as a rotation direction of the turbo fan.

## Claims

### Claim 1

A ceiling-embedded air conditioner comprising:
a ceiling-embedded casing body that has an air suction path at a center of a lower surface and has an air blowoff path around the air suction path;
a turbo fan that is disposed inside the casing body;
a heat exchanger that is disposed inside the casing body on an outer peripheral side of the turbo fan;
a bell-mouth that guides air sucked from the air suction path toward an inside of the turbo fan; and
a rectifier that is provided to erect on a back surface side of the bell-mouth at an air suction path side opposite to an air suction surface of the bell-mouth, the rectifier directing swirling airflows generated by part of air blown from the turbo fan swirling along the back surface of the bell-mouth to the heat exchanger,
wherein the rectifier has a first rectifying side vertically and linearly erected on the back surface of the bell-mouth as a base end and a second rectifying side horizontally and linearly extended from a leading end of the first rectifying side, and
the first rectifying side is formed in parallel to a ventilation surface of the heat exchanger.

### Claim 2 (depends on 1)

The ceiling-embedded air conditioner according to claim 1, wherein
the rectifier is formed integrally with the bell-mouth and is also provided as a reinforcement plate for reinforcing strength of the bell-mouth.

### Claim 3 (depends on 1)

The ceiling-embedded air conditioner according to claim 1, further comprising
a drain pan that is provided inside the casing body to receive dew condensation water generated by the heat exchanger, wherein
the rectifier is erected on the drain pan.

### Claim 4 (depends on 1)

The ceiling-embedded air conditioner according to claim 1, wherein the heat exchanger has first to fourth heat exchange portions,
the bell-mouth includes a base portion with a square shape, and a suction guide portion with a trumpet shape disposed in the base portion and extending upwardly from the base portion, a distance from an outer side of the base portion to the suction guide portion, in a straight radial line passing through the center of the circumference delimited by the trumpet portion of the suction guide portion changes, and
the rectifier is positioned such that, in the rectifier location in the bell-mouth, a distance between the outer side of the base portion and a boundary portion of the suction guide portion is shortest.

### Claim 5 (depends on 1)

The ceiling-embedded air conditioner according to claim 1, wherein the first rectifying side is located at a position where a distance between one outer side of a base portion in a rectangular shape of the bell-mouth and a boundary portion of the base portion with respect to a suction guide portion having a cylindrical shape and erecting from the base portion is shortest.

### Claim 6 (depends on 1)

The ceiling-embedded air conditioner according to claim 1, wherein the rectifier includes only four members 90 degrees spaced apart each other around the bell-mouth.

### Claim 7 (depends on 1)

The ceiling-embedded air conditioner according to claim 1, wherein the turbo fan includes a shroud disposed over the bell mouth, and the second rectifying side of the rectifier extends from behind the bell mouth to a position under an outer edge of the shroud.