Patents by Inventor Yuusuke Nakagawa

Yuusuke Nakagawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11371743
    Abstract: An air conditioning system capable of reducing noise incidental to gas-liquid two-phase transfer is provided. The air conditioning system (100) performs a refrigeration cycle in a refrigerant circuit (RC) including an outdoor unit (10), a plurality of indoor units (40), and a liquid-side connection pipe (LC) connecting the outdoor unit (10) and the indoor units (40). The air conditioning system (100) includes a second outdoor control valve (17, electric valve) decompressing the refrigerant flowing in the refrigerant circuit (RC) in accordance with an opening degree, an operating-capacity variation detection portion (74, detection portion) detecting change of the number of operating units in accordance with device information, and a device control portion (75, control portion) controlling a state of the second outdoor control valve (17).
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: June 28, 2022
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Yuusuke Nakagawa, Makoto Kojima, Takuro Yamada
  • Patent number: 11293674
    Abstract: A refrigeration apparatus includes: a heat source unit including a compressor for refrigerant and a heat-source-side heat exchanger; utilization units, each of which is connected in parallel to the heat source unit and includes a utilization-side heat exchanger; a refrigerant-flow-path switching unit that includes first gas-side control valves, each of which switches a flow of refrigerant in a corresponding one of the utilization units, and individually switches a flow of refrigerant in each of the utilization units; a first gas-side connection pipe disposed between the heat source unit and each of the first gas-side control valves and through which high-pressure gas refrigerant flows; first gas-side branch pipes, each of which is included in the first gas-side connection pipe and communicates with a corresponding one of the utilization units; and a blocking valve.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: April 5, 2022
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Yuusuke Nakagawa, Yuusuke Oka, Masahiro Honda
  • Patent number: 11268740
    Abstract: An air conditioning system includes: outdoor and indoor heat exchangers; first, second, and third control valves, which block refrigerant flow when fully closed; and a pressure adjuster. The first and second control valves are disposed in a gas-side refrigerant flow path (GL) between the outdoor and indoor heat exchangers. The third control valve is disposed in a liquid-side refrigerant flow path (LL) between the outdoor and indoor heat exchangers. The pressure adjuster adjusts the pressure of refrigerant in an indoor-side refrigerant flow path (IL) between the first control valve and the second control valve or the third control valve and the indoor heat exchanger. The pressure adjuster includes a pressure adjusting valve that bypasses refrigerant in the indoor-side refrigerant flow path (IL) to an outdoor-side refrigerant flow path (OL) between the first control valve and the second control valve or the third control valve and the outdoor heat exchanger.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: March 8, 2022
    Assignee: Daikin Industries, Ltd.
    Inventors: Takuro Yamada, Yuusuke Nakagawa, Yuusuke Oka, Masahiro Honda
  • Patent number: 11248826
    Abstract: In a refrigeration apparatus including a refrigerant circuit in which a refrigerant in a gas-liquid two-phase state flows through a liquid-side connection pipe, a refrigerant-amount determining method and a refrigerant-amount determining device capable of grasping an appropriate refrigerant charging amount corresponding to the length of the connection pipe is provided.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: February 15, 2022
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Yuusuke Nakagawa, Masahiro Honda, Yuusuke Oka, Hiroki Sasayama
  • Patent number: 11105620
    Abstract: A method for determining a pipe diameter of a liquid-side connection pipe in a refrigeration apparatus includes causing a computer to obtain a heating capacity, maximum heating load, and maximum cooling load; causing the computer to determine a pipe diameter of the liquid-side connection pipe by reducing a reference pipe diameter based on either a value obtained by dividing the maximum heating load by the maximum cooling load or a value obtained by subtracting the maximum heating load from the heating capacity; and installing the refrigeration apparatus using the liquid-side connection pipe having the determined pipe diameter.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: August 31, 2021
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Yuusuke Nakagawa, Masahiro Honda
  • Patent number: 11047590
    Abstract: An air conditioner, in which a liquid-pressure adjustment expansion valve that decompresses a refrigerant so that the refrigerant flowing through a liquid-refrigerant connection pipe is in a gas-liquid two-phase state is provided in an outdoor liquid-refrigerant pipe that connects a liquid-side end of an outdoor heat exchanger to the liquid-refrigerant connection pipe, properly transports the refrigerant in a two-phase state while suppressing an increase in a discharge temperature of a compressor. A liquid injection pipe that branches part of a refrigerant flowing through an outdoor liquid-refrigerant pipe and feeds the branched refrigerant to a compressor is connected to a portion of the outdoor liquid-refrigerant pipe on a side of an outdoor heat exchanger with respect to a liquid-pressure adjustment expansion valve.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: June 29, 2021
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Yuusuke Nakagawa, Masahiro Honda, Yuusuke Oka
  • Patent number: 11022354
    Abstract: Noise that is generated from an indoor unit is suppressed when performing two-phase transport of refrigerant by using a liquid-pressure-adjusting expansion valve in an air conditioner including an outdoor unit, a plurality of indoor units each including an indoor heat exchanger, a relay unit that switches the plurality of indoor heat exchangers so that the indoor heat exchangers individually function as an evaporator or radiator for refrigerant, and a liquid-refrigerant connection pipe and a gas-refrigerant connection pipe that connect the outdoor unit and the indoor unit via the relay unit. The relay unit includes a relay expansion valve that further decompresses the refrigerant that has been decompressed by the liquid-pressure-adjusting expansion valve.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: June 1, 2021
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Yuusuke Nakagawa, Yuusuke Oka, Masahiro Honda
  • Patent number: 10976090
    Abstract: An air conditioner includes: liquid-side indoor expansion valves corresponding to a liquid side of respective indoor heat exchangers; and gas-side indoor expansion valves corresponding to a gas side of the respective indoor heat exchangers. In a case where both a heating-operation indoor heat exchanger and a heating-stopped indoor heat exchanger are present, the controller of the air conditioner controls the liquid-side indoor expansion valve and the gas-side indoor expansion valve corresponding to the heating-stopped indoor heat exchanger such that an opening degree of the gas-side indoor expansion valve becomes smaller than an opening degree of the liquid-side indoor expansion valve.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: April 13, 2021
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Yuusuke Nakagawa, Masahiro Honda, Yuusuke Oka
  • Publication number: 20200380474
    Abstract: A monitoring device includes: a base information acquisition unit that acquires information on operation and fault of an equipment arranged at a base and position information relating to the equipment; a natural environment information acquisition unit that acquires natural environment information in a region; and an analysis unit that specifies a position of the equipment in which the fault has occurred from the information acquired by the base information acquisition unit, associates the position with a region of the natural environment information, and associates the equipment in which the fault has occurred with the natural environment information.
    Type: Application
    Filed: May 21, 2020
    Publication date: December 3, 2020
    Inventors: Masashi KONO, Nobuhiro TOTTORI, Yuusuke NAKAGAWA
  • Publication number: 20200318875
    Abstract: A refrigeration apparatus includes: a heat source unit including a compressor for refrigerant and a heat-source-side heat exchanger; utilization units, each of which is connected in parallel to the heat source unit and includes a utilization-side heat exchanger; a refrigerant-flow-path switching unit that includes first gas-side control valves, each of which switches a flow of refrigerant in a corresponding one of the utilization units, and individually switches a flow of refrigerant in each of the utilization units; a first gas-side connection pipe disposed between the heat source unit and each of the first gas-side control valves and through which high-pressure gas refrigerant flows; first gas-side branch pipes, each of which is included in the first gas-side connection pipe and communicates with a corresponding one of the utilization units; and a blocking valve.
    Type: Application
    Filed: September 29, 2017
    Publication date: October 8, 2020
    Inventors: Takuro YAMADA, Yuusuke NAKAGAWA, Yuusuke OKA, Masahiro HONDA
  • Patent number: 10712035
    Abstract: When refrigerant leakage occurs, a controller in an air conditioner performs first shutoff control to open a liquid relay shutoff valve and close an indoor expansion valve and a gas relay shutoff valve on the basis of information from a refrigerant leakage detector.
    Type: Grant
    Filed: November 21, 2019
    Date of Patent: July 14, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Yuusuke Nakagawa, Yuusuke Oka
  • Patent number: 10670282
    Abstract: To reduce noise coming from an indoor unit in an air conditioning apparatus that has an outdoor unit that has a compressor and an outdoor heat exchanger, the indoor unit that has an indoor heat exchanger, and a liquid refrigerant connection pipe and a gas refrigerant connection pipe that interconnect both units and in which a liquid pressure adjusting expansion valve that reduces a pressure of a refrigerant flowing through the liquid refrigerant connection pipe in such a way that the refrigerant is in a gas-liquid two-phase state is provided in an outdoor liquid refrigerant pipe that interconnects the liquid-side end of the outdoor heat exchanger and the liquid refrigerant connection pipe. An external expansion valve unit having an external expansion valve that further reduces the pressure of the refrigerant whose pressure has been reduced in the liquid pressure adjusting expansion valve is provided in the outdoor liquid refrigerant pipe.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: June 2, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Masahiro Honda, Yuusuke Nakagawa, Yuusuke Oka
  • Publication number: 20200141609
    Abstract: An air conditioning system capable of reducing noise incidental to gas-liquid two-phase transfer is provided. The air conditioning system (100) performs a refrigeration cycle in a refrigerant circuit (RC) including an outdoor unit (10), a plurality of indoor units (40), and a liquid-side connection pipe (LC) connecting the outdoor unit (10) and the indoor units (40). The air conditioning system (100) includes a second outdoor control valve (17, electric valve) decompressing the refrigerant flowing in the refrigerant circuit (RC) in accordance with an opening degree, an operating-capacity variation detection portion (74, detection portion) detecting change of the number of operating units in accordance with device information, and a device control portion (75, control portion) controlling a state of the second outdoor control valve (17).
    Type: Application
    Filed: July 13, 2018
    Publication date: May 7, 2020
    Inventors: Yuusuke NAKAGAWA, Makoto KOJIMA, Takuro YAMADA
  • Publication number: 20200088431
    Abstract: When refrigerant leakage occurs, a controller in an air conditioner performs first shutoff control to open a liquid relay shutoff valve and close an indoor expansion valve and a gas relay shutoff valve on the basis of information from a refrigerant leakage detector.
    Type: Application
    Filed: November 21, 2019
    Publication date: March 19, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Yuusuke NAKAGAWA, Yuusuke OKA
  • Publication number: 20200033036
    Abstract: In a refrigeration apparatus including a refrigerant circuit in which a refrigerant in a gas-liquid two-phase state flows through a liquid-side connection pipe, a refrigerant-amount determining method and a refrigerant-amount determining device capable of grasping an appropriate refrigerant charging amount corresponding to the length of the connection pipe is provided.
    Type: Application
    Filed: September 29, 2017
    Publication date: January 30, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Yuusuke NAKAGAWA, Masahiro HONDA, Yuusuke OKA, Hiroki SASAYAMA
  • Patent number: 10533764
    Abstract: When refrigerant leakage occurs, a controller in an air conditioner performs first shutoff control to open a liquid relay shutoff valve and close an indoor expansion valve and a gas relay shutoff valve on the basis of information from a refrigerant leakage detector.
    Type: Grant
    Filed: April 16, 2019
    Date of Patent: January 14, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Yuusuke Nakagawa, Yuusuke Oka
  • Publication number: 20190338986
    Abstract: To reduce noise coming from an indoor unit in an air conditioning apparatus that has an outdoor unit that has a compressor and an outdoor heat exchanger, the indoor unit that has an indoor heat exchanger, and a liquid refrigerant connection pipe and a gas refrigerant connection pipe that interconnect both units and in which a liquid pressure adjusting expansion valve that reduces a pressure of a refrigerant flowing through the liquid refrigerant connection pipe in such a way that the refrigerant is in a gas-liquid two-phase state is provided in an outdoor liquid refrigerant pipe that interconnects the liquid-side end of the outdoor heat exchanger and the liquid refrigerant connection pipe. An external expansion valve unit having an external expansion valve that further reduces the pressure of the refrigerant whose pressure has been reduced in the liquid pressure adjusting expansion valve is provided in the outdoor liquid refrigerant pipe.
    Type: Application
    Filed: September 26, 2017
    Publication date: November 7, 2019
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Masahiro HONDA, Yuusuke NAKAGAWA, Yuusuke OKA
  • Publication number: 20190293417
    Abstract: A pipe diameter determination method for determining a pipe diameter of a liquid-side connection pipe of a refrigeration apparatus that performs a cooling operation and a heating operation where the refrigeration apparatus includes an outdoor unit that has a compressor and an outdoor heat exchanger; indoor unit that has an indoor heat exchanger, and the liquid-side connection pipe and a gas-side connection pipe that connect the outdoor unit and the indoor unit with each other is provided. The pipe diameter determination method includes: determining the pipe diameter of the liquid-side connection pipe based on a cooling capacity and a heating capacity provided by the outdoor unit and the indoor unit that are installed.
    Type: Application
    Filed: November 30, 2017
    Publication date: September 26, 2019
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Yuusuke NAKAGAWA, Masahiro HONDA
  • Publication number: 20190249912
    Abstract: An air conditioner includes: liquid-side indoor expansion valves corresponding to a liquid side of respective indoor heat exchangers; and gas-side indoor expansion valves corresponding to a gas side of the respective indoor heat exchangers. In a case where both a heating-operation indoor heat exchanger and a heating-stopped indoor heat exchanger are present, the controller of the air conditioner controls the liquid-side indoor expansion valve and the gas-side indoor expansion valve corresponding to the heating-stopped indoor heat exchanger such that an opening degree of the gas-side indoor expansion valve becomes smaller than an opening degree of the liquid-side indoor expansion valve.
    Type: Application
    Filed: September 29, 2017
    Publication date: August 15, 2019
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Yuusuke NAKAGAWA, Masahiro HONDA, Yuusuke OKA
  • Publication number: 20190242602
    Abstract: When refrigerant leakage occurs, a controller in an air conditioner performs first shutoff control to open a liquid relay shutoff valve and close an indoor expansion valve and a gas relay shutoff valve on the basis of information from a refrigerant leakage detector.
    Type: Application
    Filed: April 16, 2019
    Publication date: August 8, 2019
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Yuusuke NAKAGAWA, Yuusuke OKA