Ricoh Company, Ltd.

Fujitsu General Limited

Canon Kabushiki Kaisha

Nissan Motor Company Limited

Other

Fujitsu Corporation

Japan Crown Cork Co Ltd.

Kabushiki Kaisha Toshiba

Nippon Telegraph and Telephone Corporation

Adv Antest Corporation

Isuzu Motors Limited

Toyo Seikan Kaisha, Ltd.

Tokico, Ltd.

Nippon Telegraph and Telephone Public Corporation

Piolax, Inc.

Takashi Kimura

Masakazu Yoshida

Masanori Hirano

Toshihito Kamei

Shigetoshi Hosaka

Yoshihisa Ohta

Kazuo Sunahara

Yasunobu Takagi

Manabu Suhara

Yasuhiko Ohsawa

Tatsuhiro Fukuzawa

Fumio Munakata

Takayuki Ito

Takashi Mori

Naoki Kikuchi

Tomohiro Inoue

Hiroyuki Nohira

Masahide Hasegawa

Junji Kobayashi

Yoko Yamada

Naoya Morohoshi

Masahiro Ando

Junichi Takahashi

Shinichi Hatanaka

Hiroshi Watanabe

Makoto Tanaka

Hiroshi Ikeda

Noriyuki Abe

Takahiro Yoshida

Masaya Maeda

Yosuke Kashiide

Osamu Matsumoto

Isao Koishi

Takayuki Kikuchi

Daisuke Yamamoto

Taku Satoh

Takahiro Matsunaga

Kotaro Toya

Hideya Tamura

Yasuhiro Oka

Naoki Nakano

Shinju Watanabe

Kuniko Hayashi

Ken Nakashima

Takahiro Ike

Takuya Mihara

Shigetaka Sakakibara

Yuuji Tanjo

Keito Kawai

Arata Yamaguchi

Norio Fujiki

Makoto Fujiki

Michio Umezawa

Yoshiaki Hoshino

Junsuke Ino

Mikio Ohashi

Seiji Fukushi

Hironobu Murai

Hiroaki Sagae

Hiroo Edakubo

Yuki Watanabe

Hidetoshi Matsuoka

Tatsuzo Ushiro

Mitsuru Owada

Hirotoshi Eguchi

Naoshi Saito

Osamu Ishii

Yoshiki Tanaka

Keiichi Fukuzawa

Toshiya Yatomi

Kunihiro Yamanaka

Takahiro Kurosawa

Tatsuhiko Oikawa

Katsumi Hashimoto

Minoru Iida

Akira Tomitaka

Atsushi Iwata

Sumiaki Aoki

Kazuo Tanabe

Mitsuru Shingyohuchi

Yoshimi Nemoto

Shinichi Takenouchi

Kunio Nakaguro

Norio Yano

Masahiro Tomatsu

Tetsuya Abe

Makoto Shimotani

Megumi Yukawa

Nobuhiro Hayashida

Akio Iwasaki

Noboru Osada

Naoki Tsuchimochi

Yasuharu Watanabe

Kazuki Suda

Taeko Takahashi

Shinya Asano

Kenichi Chihara

Kazunobu Inoue

Osamu Adachi

Sanshiro Hattori

In an air conditioner, an inlet pipe penetrates a location that is offset towards an outer circumferential side from an apex portion of a top portion. The suction pipe penetrates a location that is offset towards the outer circumferential side from an apex portion of a bottom portion and is inserted into the interior of the main body portion, and the suction inner pipe, which constitutes a portion of the suction pipe that lies in the interior of the main body portion, extends as far as an upper portion of the main body portion so that an inlet port is disposed in a space defined by the top portion. Then, the suction inner pipe includes a bend portion that is bent from a location lying slightly above a location where the suction pipe penetrates the bottom portion as an originating point.

Gas-liquid separator and air conditioner including the same

There is provided an air conditioner capable of displaying sufficient cooling ability in each indoor unit by allowing a sufficient amount of refrigerant to flow into indoor units where cooling ability cannot be displayed. By executing refrigerant amount balance control, since degrees of opening of indoor expansion valves are narrowed in indoor units whose refrigerant superheating degrees are smaller than an average refrigerant superheating degree, amounts of refrigerant flowing into the indoor expansion valves are decreased. In the indoor unit where the refrigerant superheating degree is higher than the average refrigerant superheating degree, since refrigerant pressure on a downstream side of the indoor expansion valve is also decreased due to the degrees of opening of the indoor expansion valves being narrowed, the difference in pressure between the upstream side and the downstream side of the indoor expansion valve increases and an amount of refrigerant flowing into the indoor unit is increased.

Air conditioner

An air conditioner includes: an outdoor unit; a plurality of indoor units respectively including indoor heat exchangers; expansion valves respectively provided to the plurality of indoor units, the expansion valves being configured to adjust flow rates of a refrigerant in the indoor heat exchangers; and a controller for executing a refrigerant amount balance control for adjusting opening degrees of the expansion valves so that operation state amounts, with which the indoor heat exchangers exert heat exchange amounts, of the plurality of indoor units become equal to each other.

In an air conditioning apparatus, when the amounts of refrigerant oils retained in a first compressor and a second compressor are increased and oil levels in the first compressor and the second compressor reach a first oil outflow part and a second oil outflow part, the refrigerant oils subsequently sucked into the first compressor and the second compressor flow out of the first oil outflow part and the second oil outflow part to a first oil outflow pipe and a second oil outflow pipe, and flow from the first oil outflow pipe and the second oil outflow pipe to a refrigerant outflow pipe. The refrigerant oils flowing in the refrigerant outflow pipe from the first and second compressor through the first and second oil outflow pipe flow out of an outdoor unit through a four-way valve, and circulate through a refrigerant circuit together with refrigerants.

Air conditioning apparatus

An outdoor unit control unit has a defrosting operation condition table that defines an activation rotational speed based on the total sum of the rated capacity of indoor units and a refrigerant pipe length that is the length of a liquid pipe or of a gas pipe. The outdoor unit control unit uses the total sum of the rated capacity of the indoor units and refers to the defrosting operation condition table, so as to determine the activation rotational speed, and then the outdoor unit control unit activates a compressor at the determined activation rotational speed when starting a defrosting operation, maintains this activation rotational speed for a predetermined time (one minute) from the start of the defrosting operation, and drives the compressor.

Air conditioner with outdoor unit compressor driven at controllable activation rotational speed

A CPUreceives suction pressure PL and a suction temperature Te, calculates a saturation temperature corresponding to the evaporation pressure Tsby using the suction pressure PL, and calculates a suction superheating degree SHs of a compressorby using the suction temperature Te and the saturation temperature corresponding to the evaporation pressure Ts. The CPUreads a current opening degree De of an outdoor expansion valve. Next, the CPUuses the received suction pressure PL and opening degree De of the outdoor expansion valveand the calculated suction superheating degree SHs, refers to an outdoor fan control table, and determines a control aspect of an outdoor fan. The CPUexecutes control of the outdoor fanin accordance with the control aspect that is determined by referring to an outdoor fan control table

Air conditioner with outdoor fan control in accordance with suction pressure and suction superheating degree of a compressor

An air conditionerof the embodiment of the present invention, when all compressors-have been stopping for a given time or more, starts an air conditioning operation without performing pressure equalizing control in switch units-with starting the operation of the air conditioner. Also, when the stopping time of all compressors-is less than the given time, the air conditionerperforms the pressure equalizing control by controlling switch units-with starting the operation of the air conditioner. In this case, when the stopping time reaches the given time during execution of the pressure equalizing processing control, the pressure equalizing processing control being executed is stopped and the air conditioning operation is started.

An outdoor unit control unithas a defrosting operation condition tablethat defines a defrosting operation interval time Tm in accordance with a total sum of rated capacity of indoor unitstoand a refrigerant pipe length as lengths of a liquid pipeand a gas pipe. The outdoor unit control unituses the total sum of the rated capacity of indoor unitstoinput by using an installation information input unitand refers to the defrosting operation condition table, so as to determine the defrosting operation interval time Tm. Then, the outdoor unit control unitforcibly performs a defrosting operation when the defrosting operation interval time Tm elapses without establishment of a defrosting operation start condition since the last defrosting operation is terminated.

A rotational speed Cr of a compressorduring a defrosting operation is controlled within a control range that corresponds to a capacity ratio P, a total sum Pi of rated capacity of an indoor unit, or a refrigerant pipe length Lr. Accordingly, even in the case where a refrigerant circulation amount during the defrosting operation is reduced due to an installation state of an air conditioner, it is possible to prevent suction pressure from being significantly reduced and falling below a performance lower limit value of the compressor. Thus, damage to the compressorcan be prevented. In addition, it is possible to prevent a case where the suction pressure falls below the performance lower limit value of the compressorand thus low-pressure protection control is executed. Therefore, a case where the restoration of the heating operation is delayed does not occur.

An outdoor unit control unithas a defrosting operation condition tablethat defines an activation rotational speed Cr in accordance with a total sum of flow rate coefficients Cva that is a total sum of flow rate coefficients Cv representing capacities of indoor expansion valvesto. The outdoor unit control unitcalculates the total sum of the flow rate coefficients Cva by adding the flow rate coefficient Cv of each of the indoor expansion valvesto, and refers to the defrosting operation condition table, so as to determine the activation rotational speed Cr. Then, the outdoor unit control unitactivates a compressorat the determined activation rotational speed Cr when starting a defrosting operation, maintains this activation rotational speed Cr for a predetermined time from the start of the defrosting operation, and drives the compressor

When the temperatures of outdoor heat exchangersanddetected by outdoor heat exchanger temperature sensorsandbecome equal to or higher than 5 degrees C. and the sucking superheating degrees of compressorsandbecome equal to or lower than 0 degrees C. while an air conditioning apparatusis performing the reverse defrosting operation, the reverse defrosting operation is stopped and the heating dominant operation is resumed. At this time, the total operating times of the compressorsandare reset. The sucking superheating degrees of the compressorsandare obtained by subtracting the low pressure saturation temperatures calculated from the sucking pressures of the compressorsand, from the temperatures of the refrigerants sucked into the compressorsandwhich temperatures are detected by the sucking temperature sensorsand

An outdoor unit of an air conditioner includes: an outdoor fan; an outdoor air temperature detector; and a controller, wherein the controller performs: a fan defrost operation to circulate the refrigerant in the same order as in the case of a cooling operation and rotate the outdoor fan when the outdoor air temperature is within a predetermined temperature range, a fan defrost operation over a period of a first fan defrost operation time when the outdoor air temperature is lower than a first predetermined temperature, and a fan defrost operation over a period of a second fan defrost operation time that is longer than the first fan defrost operation time when the outdoor air temperature is equal to or higher than a second predetermined temperature that is higher than the first predetermined temperature.

Outdoor unit of air conditioner and air conditioner

A driver circuit device according to an embodiment includes an input part receiving a first signal obtained by logical operation of a first control signal and a first clock signal. An oscillator outputs a counter signal having a shorter cycle than the first clock signal. A measuring part measures a cycle of the first signal using the counter signal. A control signal generator generates a second control signal based on the cycle of the first signal and a logic of the first signal. A clock generator generates a second clock signal based on the cycle of the first signal. An output part outputs the second control signal and the second clock signal from the clock generator.

Driver circuit device

An outdoor unit for an air-conditioning apparatus includes an outdoor heat exchanger; a compressor; a refrigerant pipe configured to couple the outdoor heat exchanger and the compressor with an indoor unit including an indoor heat exchanger; and a control unit that determines whether the heating capacity of the indoor unit performing a heating operation is decreased by the refrigerant stagnated in the indoor heat exchanger.

Outdoor unit for air-conditioning apparatus, and air-conditioning apparatus

An outdoor unit for an air-conditioning apparatus includes: a compressor; an outdoor fan; a plurality of outdoor heat exchangers coupled to a plurality of indoor units; a switching member configured to switch functions of the outdoor heat exchangers to either condensers or evaporators by switching of coupling states between the compressor and the outdoor heat exchangers; and a control unit configured to calculate a low pressure saturation temperature during a cooling operation or a cooling-main operation, and configured to cause all of the plurality of outdoor heat exchangers to serve as condensers by controlling the switching member when a state in which an open-air temperature is lower than the low pressure saturation temperature continues for a predetermined time.

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Kanagawa, Japan

Takashi Kimura