Hitachi-johnson Controls Air Conditioning, Inc.

Johnson Controls-hitachi Air Conditioning Technology (hong Kong) Limited

Shuuhei Tada

Koji Naito

Katsuaki Nagahashi

Kazumoto Urata

Kenji Matsumura

Nagatoshi Ooki

Atsuhiko Yokozeki

Takeshi Endo

Hayato Mori

Hiroaki Tsuboe

Mamoru Houfuku

Nagatoshi Oki

Atsuhiko Yokozeni

To predict and detect a failure in a compressor provided in an air conditioner, the air conditioner is provided with: a heat exchanger; the compressor; piping connecting the heat exchanger and the compressor with each other; and a control unit controlling the compressor and having a compressor failure predicting and detecting means, and in this air conditioner, the compressor failure predicting and detecting means of the control unit includes: a current detecting part detecting a driving current driving the compressor; a pulsation detecting part detecting pulsation in a driving current detected by the current detecting part; and an anomaly determining part predicting or detecting any failure in the compressor based on a magnitude and a duration of pulsation in a driving current detected by the pulsation detecting part.

Air conditioner provided with means for predicting and detecting failure in compressor and method for predicting and detecting the failure

An air conditioner that includes a heat exchanger including: heat-transfer pipes extending in a horizontal direction and spaced apart at predetermined intervals in a vertical direction and configured to allow a thermal medium to flow therein. A part of the heat transfer pipes are used for at least one inflow path into which the thermal medium flows from the outside of the heat exchanger and the other part of the heat transfer pipes are used for at least one outflow path from which the thermal medium flows out to the outside. At least one connection pipe through which an outlet side of one of the at least one inflow path communicates with an inlet side of one of the at least one outflow path.

Air conditioner

An air conditioner capable of detecting resonance of a casing of an outdoor or indoor unit of an air conditioner at a low cost with high accuracy is provided. An outdoor unit of the air conditioner includes: a propeller fan that blows air to a heat exchanger; a fan motor that drives the propeller fan; a current detector that detects a current value of the fan motor; a phase detector that detects the magnetic pole position of the fan motor; a fan rotation speed detector that detects the rotation speed of the fan motor; a pulsation detector that detects pulsation of the current value; and a resonance determiner that determines resonance of a system of a casing of the outdoor unit having the fan motor. If the resonance determiner determines resonance, a controller executes resonance avoidance control for increasing or decreasing the fan rotation speed by a predetermined rotation speed.

Heat transfer pipesandextend from the other end sectionB to one end sectionA in an intermediate row Land combine in the one end sectionA to be heat transfer pipesand. The heat transfer pipesandare configured to extend back and force once between the one end sectionA and the other end sectionB in a upstream row L. Heat transfer pipesandextend from the other end sectionB to the one end sectionA in the intermediate row Land combine in the one end sectionA to be heat transfer pipesand. The heat transfer pipesandare configured to extend back and force once between the one end sectionA and the other end sectionB in the upstream row L. The heat transfer pipeextending from the other end sectionB to the one end sectionA and the heat transfer pipefrom the other end sectionB to the one end sectionA are arranged to be adjacent to each other.

Aft conditioner

Growing community of inventors

Tokyo, Japan

Shuuhei Tada