# US 12,000,611 B2 · Air conditioner

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

- Number: US 12,000,611 B2
- Document ID: US12000611B2
- Status: Granted
- Kind: B2
- Application number: 17/761,431
- Filed: 2020-09-18
- Published: 2022-11-03
- Granted: 2024-06-04
- Earliest claimed: 2019-09-20
- Assignees: Fujitsu General Limited
- Applicants: Fujitsu General Limited
- Inventors: Yutaka Shimamura; Takashi Matsuzaki; Toshihiko Watanabe
- Web page: https://patentgrep.com/patent/US12000611B2

## CPC

- F24F 11/74: for controlling air flow rate or air velocity
- F24F 11/49: ensuring correct operation, e.g. by trial operation or configuration checks
- F24F 11/77: by controlling the speed of ventilators
- F24F 2110/10: Temperature
- F24F 2110/12: of the outside air
- F24F 2140/10: Pressure
- F24F 2140/12: Heat-exchange fluid pressure
- F24F 2140/20: Heat-exchange fluid temperature
- 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

In an air conditioner of the present embodiment capable of selecting either a fan rotation speed determined on the basis of a static pressure value and an air volume or a required fan rotation speed, motor control means determines, on the basis of the static pressure Pt, the fan rotation speed Rm of a fan motor that provides the air volume Av required by the user, and transmits the determined fan rotation speed Rm to an indoor unit control means. When the fan rotation speed Rm received from the motor control means is a prohibited rotation speed, the indoor unit control means transmits a correction fan rotation speed different from the prohibited rotation speed to the motor control means, and the motor control means drives the fan motor at the received correction fan rotation speed.

## Claims

### Claim 1

An air conditioner comprising:
an indoor unit including an indoor heat exchanger, an indoor unit fan including a fan motor, and a static pressure sensor configured to detect a static pressure of air blown out from the indoor unit fan; and
a controller configured to control the fan motor,
wherein the controller uses a static pressure value detected by the static pressure sensor and an air volume of conditioned air blown out from the indoor unit required by a user to determine a first fan rotation speed, which is a rotation speed of the indoor unit fan that implements the air volume,
when the determined first fan rotation speed is not a prohibited rotation speed at which resonance occurs in the indoor unit, the controller controls the fan motor so that the indoor unit fan rotates at the first fan rotation speed,
when the determined first fan rotation speed is the prohibited rotation speed, the controller controls the fan motor so that the indoor unit fan rotates at a second fan rotation speed different from the first fan rotation speed,
the controller sets the second fan rotation speed to a rotation speed close to the first fan rotation speed and higher than the prohibited rotation speed when the first fan rotation speed is the prohibited rotation speed and the air volume used to determine the first fan rotation speed is larger than an air volume before the first fan rotation speed, and
the controller sets the second fan rotation speed to a rotation speed close to the first fan rotation speed and lower than the prohibited rotation speed when the air volume used to determine the first fan rotation speed is smaller than the air volume before the first fan rotation speed.

### Claim 2 (depends on 1)

The air conditioner according to claim 1, wherein the controller sets the second fan rotation speed to a rotation speed close to the first fan rotation speed and higher than the prohibited rotation speed when the first fan rotation speed is the prohibited rotation speed and the air volume used to determine the first fan rotation speed is larger than an air volume before the first fan rotation speed, and
the controller sets the second fan rotation speed to a rotation speed close to the first fan rotation speed and lower than the prohibited rotation speed when the air volume used to determine the first fan rotation speed is smaller than the air volume before the first fan rotation speed.