Patents by Inventor Takuro Yamada

Takuro Yamada 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: 11454433
    Abstract: An air-conditioning unit that is able to suppress ignition at an electric heater even when leakage of refrigerant occurs while a low-GWP refrigerant is used is provided. In an outdoor unit (20) including a casing (60), a compressor (21) provided inside the casing (60) and configured to compress refrigerant containing 1,2-difluoroethylene, and a drain pan heater (54) provided inside the casing (60), an electric power consumption of the drain pan heater (54) is lower than or equal to 300 W.
    Type: Grant
    Filed: June 25, 2020
    Date of Patent: September 27, 2022
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji Kumakura, Takuro Yamada, Atsushi Yoshimi, Ikuhiro Iwata, Mitsushi Itano, Daisuke Karube, Yuuki Yotsumoto, Kazuhiro Takahashi, Yuzo Komatsu, Shun Ohkubo, Tatsuya Takakuwa
  • Patent number: 11435118
    Abstract: A heat source unit and a refrigeration cycle apparatus that are able to reduce damage to a connection pipe when a refrigerant containing at least 1,2-difluoroethylene is used are provided. An outdoor unit (20) that is connected via a liquid-side connection pipe (6) and a gas-side connection pipe (5) to an indoor unit (30) including an indoor heat exchanger (31) and that is a component of an air conditioner (1) includes a compressor (21) and an outdoor heat exchanger (23). A refrigerant containing at least 1,2-difluoroethylene is used as a refrigerant. A design pressure of the outdoor unit (20) is lower than 1.5 times a design pressure of each of the liquid-side connection pipe (6) and the gas-side connection pipe (5).
    Type: Grant
    Filed: June 25, 2020
    Date of Patent: September 6, 2022
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji Kumakura, Takuro Yamada, Atsushi Yoshimi, Ikuhiro Iwata, Mitsushi Itano, Daisuke Karube, Yuuki Yotsumoto, Kazuhiro Takahashi, Tatsuya Takakuwa, Yuzo Komatsu, Shun Ohkubo
  • Publication number: 20220278594
    Abstract: A first circuit board 16 and a second circuit board 17, each of which have mounted thereon circuit components for controlling and driving an electric motor, are stacked with a space left therebetween such that one board surface of the first circuit board and one board surface of the second circuit board are opposed to and face each other in the direction of a rotation shaft 14 of the electric motor. In a state that the first circuit board 16 and the second circuit board 17 are attached to the motor housing, a receptacle connector 28 mounted on the first circuit board and a plug connector 34 mounted on the second circuit board form a “board-to-board connector” by which the circuit components of the first and second circuit boards are electrically connected.
    Type: Application
    Filed: August 18, 2020
    Publication date: September 1, 2022
    Applicant: HITACHI ASTEMO, LTD.
    Inventors: Kazuhiko NAKANO, Takuro KANAZAWA, Narutoshi YAMADA, Tomohiro FUKUDA
  • Publication number: 20220264746
    Abstract: A circuit substrate (3) is provided with first and second rigid parts (11, 12) having six metal foil layers, and a thin flexible part (13) having two metal foil layers connecting the two rigid parts. A ground wiring (51) which is shaped like a wide strip is formed on the surface metal foil layer, and a plurality of inter-rigid-part wirings (55) are formed on the inner metal foil layer in parallel lines. Outer edges (51a) of the ground wiring (51) are positioned closer to side edges (13a) of the flexible part (13) than to the inter-rigid-part wirings (55). The ground wiring (51) protects the inter-rigid-part wirings (55) from cracks.
    Type: Application
    Filed: July 1, 2020
    Publication date: August 18, 2022
    Applicant: HITACHI ASTEMO, LTD.
    Inventors: Hideyuki HARA, Takuro KANAZAWA, Narutoshi YAMADA
  • Publication number: 20220228782
    Abstract: Refrigerant is caused to be in a superheating state without impairing the performance of a cascade heat exchanger. A refrigerant cycle system includes a first refrigerant circuit, a second refrigerant circuit, and a first cascade heat exchanger. The first cascade heat exchanger exchanges heat between a first refrigerant that flows in the first refrigerant circuit and a second refrigerant that flows in the second refrigerant circuit. The refrigerant cycle system includes a switching mechanism. The switching mechanism switches a flow path of a refrigerant of at least either one of the first refrigerant circuit and the second refrigerant circuit. The first cascade heat exchanger includes a first main heat exchanging unit acid a first sub heat exchanging unit. The first sub heat exchanging unit is configured to cause the first refrigerant that has passed through the first main heat exchanging unit to be in a superheating state.
    Type: Application
    Filed: June 11, 2020
    Publication date: July 21, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji KUMAKURA, Takuro YAMADA, Atsushi YOSHIMI, Ikuhiro IWATA, Tomoatsu MINAMIDA
  • Publication number: 20220220353
    Abstract: An air conditioning apparatus is an air conditioning apparatus dedicated to cooling and includes a first circuit and a second circuit. The first circuit has an outdoor heat exchanger that cools a first refrigerant by outdoor air. In the second circuit, a first heat transfer medium that is cooled by exchanging heat with the first refrigerant that flows in the first circuit flows. The first refrigerant is a HFO refrigerant having a critical temperature higher than that of R32.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Atsushi YOSHIMI, Eiji KUMAKURA, Ikuhiro IWATA, Takeru MIYAZAKI, Takuro YAMADA, Yoshiki YAMANOI, Yuuta IYOSHI
  • Publication number: 20220221168
    Abstract: An air conditioner includes an ejector that raises a pressure of refrigerant by using energy for refrigerant decompression and expansion. A switching mechanism switches between a refrigerant flow in a first operation and a refrigerant flow in a second operation. The air conditioner is configured such that in the first operation, refrigerant compressed by a compression mechanism radiates heat in a use-side heat exchanger and is decompressed and expanded by the ejector while refrigerant evaporated in a heat-source-side heat exchanger is raised in pressure by the ejector. The air conditioner is configured such that in the second operation, refrigerant compressed by the compression mechanism radiates heat in the heat-source-side heat exchanger and is decompressed and expanded by a first expansion valve before being evaporated in the use-side heat exchanger while refrigerant does not flow through the ejector.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Atsushi YOSHIMI, Takuro YAMADA, Eiji KUMAKURA, Ikuhiro IWATA, Takeru MIYAZAKI
  • Publication number: 20220221202
    Abstract: At least one heat-source side cycle and at least one load side cycle share a cascade heat exchanger. A total number of cycles provided by the at least one heat-source side cycle and the at least one load side cycle is three or more, such that there is a first cycle, a second cycle and a third cycle. The first cycle circulates a first refrigerant or heat medium. The second cycle circulates a second refrigerant or heat medium. The third cycle circulates a third refrigerant or heat medium. The first refrigerant or heat medium, the second refrigerant or heat medium, and the third refrigerant or heat medium are different from one another.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Atsushi YOSHIMI, Eiji KUMAKURA, Ikuhiro IWATA, Takeru MIYAZAKI
  • Publication number: 20220221196
    Abstract: A heat-source-side heat exchanger is divided so that a heat-source-side heat exchanger that functions as an evaporator also functions as an intermediate cooler. Since, when an air conditioner includes a bypass pipe, a heat-source-side heat exchanger that functions as an evaporator and as an intermediate cooler also further functions as a radiator, operation efficiency is increased.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Atsushi YOSHIMI, Takuro YAMADA, Eiji KUMAKURA, Ikuhiro IWATA, Takeru MIYAZAKI
  • Publication number: 20220221204
    Abstract: In a refrigeration cycle apparatus, a switching mechanism includes a first channel and performs switching among a first, second and third connection states. In the first connection state, the refrigeration cycle apparatus repeatedly performs a first cycle in which refrigerant flows through a compressor, a first heat exchanger, a second heat exchanger, and the compressor in that order. In the second connection state, the refrigeration cycle apparatus repeatedly performs a second cycle in which refrigerant flows through the compressor, the second heat exchanger, the first heat exchanger, and the compressor in that order. In the third connection state, a passage between the compressor and the first heat exchanger and a passage between the compressor and the second heat exchanger are closed, and the first channel in the refrigeration cycle apparatus provides interconnection between the first heat exchanger and the second heat exchanger.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takeru MIYAZAKI, Hiromune MATSUOKA, Atsushi YOSHIMI, Eiji KUMAKURA, Ikuhiro IWATA, Tomoatsu MINAMIDA, Takuro YAMADA
  • Publication number: 20220221205
    Abstract: A refrigeration cycle device includes a heat source, a first use unit, a second use unit, a first connection flow path, and a second connection flow path. The heat source has a compressor and a heat-source side heat exchanger. The first use unit is separated from the heat source unit and has a first use-side heat exchanger. The second use unit is separated from the heat source unit and has a second use-side heat exchanger. The first connection flow path connects the heat source unit to the first and the second use units and causes a first refrigerant to flow. The second connection flow path connects the heat source unit to the first and the second use units and causes a second refrigerant to flow. A specific enthalpy of the second refrigerant is smaller than a specific enthalpy of the first refrigerant.
    Type: Application
    Filed: March 30, 2022
    Publication date: July 14, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Atsushi Yoshimi, Eiji Kumakura, Ikuhiro Iwata, Takeru Miyazaki, Hiromune Matsuoka
  • Publication number: 20220214056
    Abstract: An air conditioner includes: use-side units that are each switchable between a cooling operation and a heating operation; and a heat-source-side unit including a compressor, a discharge pipe through which a refrigerant discharged from the compressor flows, a first main heat-source-side flow path and a second main heat-source-side flow path that branch off from the discharge pipe, a first heat-source-side heat exchanger, a second heat-source-side heat exchanger, a first economizer heat exchanger, and a second economizer heat exchanger. The first heat-source-side heat exchanger is connected to the first economizer heat exchanger in series in the first main heat-source-side flow path. The second heat-source-side heat exchanger is connected to the second economizer heat exchanger in series in the second main heat-source-side flow path.
    Type: Application
    Filed: March 25, 2022
    Publication date: July 7, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Atsushi Yoshimi, Takuro Yamada, Eiji Kumakura, Ikuhiro Iwata, Takeru Miyazaki
  • Publication number: 20220214085
    Abstract: An evaporator includes: fins disposed at a predetermined interval in a fin thickness direction; heat transfer tubes extending through the fins in the fin thickness direction; and a first heat exchange section in which, when the heat transfer tubes are viewed in the fin thickness direction, a center of distribution of the heat transfer tubes in an airflow direction is disposed on a leeward side of a center of the fins in the airflow direction. The evaporator is disposed in a refrigeration cycle apparatus in which a non-azeotropic refrigerant mixture is enclosed.
    Type: Application
    Filed: March 27, 2022
    Publication date: July 7, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji Kumakura, Ikuhiro Iwata, Takuro Yamada, Ryuhei Kaji, Tomoki Hirokawa
  • Publication number: 20220214089
    Abstract: A refrigeration apparatus includes: a compressor; an outdoor heat exchanger connected to the compressor; an indoor heat exchanger connected to the compressor; and an expansion valve disposed between the outdoor heat exchanger and the indoor heat exchanger. In cooling operation, a refrigerant flows through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger in this order. In heating operation, the refrigerant flows through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger in this order. The refrigerant is an HFO (hydrofluoroolefin) refrigerant or a refrigerant mixture that includes an HFO refrigerant. The indoor heat exchanger and the outdoor heat exchanger are cross-fin-type heat exchangers or stack-type heat exchangers.
    Type: Application
    Filed: March 28, 2022
    Publication date: July 7, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ikuhiro Iwata, Eiji Kumakura, Takuro Yamada, Ryuhei Kaji, Tomoki Hirokawa
  • 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: 11274866
    Abstract: An air conditioning system includes a refrigerant circuit including a use-side circuit, heat-source-side circuit and refrigerant release circuit, a refrigerant leakage detection unit in the use-side circuit, a heat-source-side control valve that enables, when in an opened state, the heat-source-side circuit to communicate with the refrigerant release circuit, a rupture disk that is disposed in the refrigerant release circuit and enables, when in a first state (an open state), the refrigerant release circuit to communicate with an external space to release refrigerant, and a controller. When no leakage of refrigerant in the use-side circuit is detected, the controller controls the heat-source-side control valve to a. closed state. When leakage of refrigerant, in the use-side circuit is detected by the refrigerant leakage detection unit, the controller switches the heat-source-side control valve to the opened state and causes the rupture disk to shift to the first state.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: March 15, 2022
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro Yamada, Masahiro Honda, Tetsuya Shirasaki
  • 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
  • Publication number: 20220003470
    Abstract: Efficiency in refrigerant charging work is addressed when a refrigerant recovered from the first heat source unit is to be charged to a second heat source unit. In a refrigerant charging method in which a first heat source unit of an already installed refrigeration cycle apparatus in which a refrigeration cycle is to be performed by a refrigerant that circulates is replaced with a second heat source unit, transferring the refrigerant from the first heat source unit to the second heat source unit is included. In addition, the method includes measuring the weight of the refrigerant that is transferred from the first heat source unit to the second heat source unit.
    Type: Application
    Filed: September 20, 2019
    Publication date: January 6, 2022
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takuro YAMADA, Atsushi YOSHIMI, Eiji KUMAKURA, Ikuhiro IWATA