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公开(公告)号：US10557648B2
公开(公告)日：2020-02-11
申请号：US15618321
申请日：2017-06-09
Inventor： Koji Naito , Naoyuki Fushimi , Kazumoto Urata , Gen Yasuda , Kazunori Fukuda
Abstract: A cooling/heating switching unit includes first to third fittings, expansion valves and expansion-valve driving sections, a housing, a heat insulating material, and a refrigerant leak detection sensor. The first and second fittings respectively connect with a high/low-pressure-gas main pipe and a low-pressure-gas main pipe, which are linked to an outdoor unit. The third fitting connects with an indoor-unit connection pipe, which is linked to indoor units. The expansion valve for high/low-pressure-gas pipe, the expansion valve for low-pressure-gas pipe, and expansion-valve driving sections selectively connect the first or second fitting with the third fitting via a refrigerant pipe to control a flow direction of refrigerant. The housing houses the refrigerant pipe. The heat insulating material fills inside of the housing to insulate the refrigerant pipe arranged inside of the housing from heat. The refrigerant leak detection sensor is installed outside of the housing to detect leaked refrigerant.
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公开(公告)号：US10527322B2
公开(公告)日：2020-01-07
申请号：US15758419
申请日：2015-09-11
Inventor： Koji Naito , Kazumoto Urata , Kazuhiko Tani , Masayoshi Murofushi , Gen Yasuda
Abstract: Provided is a air conditioner including high-and-low-pressure gas pipe expansion valves each of which is provided to a corresponding one of the cooling-heating switching units and adjusts feeding of high-temperature and high-pressure gas refrigerant to the corresponding indoor unit; and a refrigeration cycle controller which adjusts a valve opening degree of the high-and-low-pressure gas pipe expansion valve of the cooling-heating switching unit connected to one of the indoor units which is not in heating operation, in accordance with a determination result on excess or deficiency of refrigerant in a refrigeration cycle.
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公开(公告)号：US11280530B2
公开(公告)日：2022-03-22
申请号：US15757779
申请日：2015-09-11
Inventor： Shuuhei Tada , Katsuaki Nagahashi , Koji Naito
IPC: F25B49/02 , F04B49/10 , F04B35/04 , F25B49/00 , F25B13/00 , F04B49/06 , F04C23/00 , F04C28/28 , F04C18/02
Abstract: 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.
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公开(公告)号：US10533783B2
公开(公告)日：2020-01-14
申请号：US16214377
申请日：2018-12-10
Inventor： Jun Xue , Koji Naito , Atsuhiko Yokozeki
Abstract: An air conditioner including an outdoor device that includes a bypass path connecting a discharge side of the compressor and a suction side of the compressor, an on-off valve configured to open/close the bypass path, and a control device configured to control the compressor, the decompression device, and the on-off valve. The control device opens the on-off valve in a state in which the compressor is stopped to execute such bypass opening that refrigerant circulates, through the bypass path, from the discharge side of the compressor in a refrigerant storage state in which refrigerant is stored to the suction side of the compressor in a substantially vacuum state, and evaluates a volume of the pipe.
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