Patents by Inventor Ikuhiro Iwata
Ikuhiro Iwata 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).
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Publication number: 20250043787Abstract: The robustness of refrigerant against disproportionation reactions is improved. A method uses, as refrigerant for a compressor, a composition that contains one or two or more selected from a group of ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropene (HFO-1234yf), and 1,3,3,3-tetrafluoropropene (HFO-1234ze), in which the compressor includes a discharge pipe made of metal having a greater heat capacity than a discharge pipe of a compressor that uses R32, R410A, R134a, or R404A as refrigerant, or a casing that includes an intake pipe connection section made of metal having a greater heat capacity than an intake pipe connection section of a casing of the compressor that uses R32, R410A, R134a, or R404A as refrigerant.Type: ApplicationFiled: October 25, 2024Publication date: February 6, 2025Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Tomoyuki GOTO, Takashi USUI, Taichi OZAKI, Eiji KUMAKURA, Ikuhiro IWATA, Masaki TANAKA
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Patent number: 12163712Abstract: 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: GrantFiled: March 29, 2022Date of Patent: December 10, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Atsushi Yoshimi, Takuro Yamada, Eiji Kumakura, Ikuhiro Iwata, Takeru Miyazaki
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Patent number: 12163707Abstract: 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: GrantFiled: March 29, 2022Date of Patent: December 10, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Takeru Miyazaki, Hiromune Matsuoka, Atsushi Yoshimi, Eiji Kumakura, Ikuhiro Iwata, Tomoatsu Minamida, Takuro Yamada
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Patent number: 12163706Abstract: 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: GrantFiled: March 28, 2022Date of Patent: December 10, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Ikuhiro Iwata, Eiji Kumakura, Takuro Yamada, Ryuhei Kaji, Tomoki Hirokawa
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Patent number: 12140358Abstract: A refrigerant cycle system includes: a primary-side cycle of a vapor compression type that circulates a first refrigerant; a secondary-side cycle of a vapor compression type that circulates a second refrigerant; and a cascade heat exchanger that exchanges heat between the first refrigerant and the second refrigerant. The secondary-side cycle includes a secondary-side heat exchanger that uses cold or heat obtained by the second refrigerant from the cascade heat exchanger. The secondary-side heat exchanger includes a flat multi-hole pipe.Type: GrantFiled: June 10, 2020Date of Patent: November 12, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Takuro Yamada, Eiji Kumakura, Atsushi Yoshimi, Ikuhiro Iwata, Tomoatsu Minamida
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Patent number: 12092374Abstract: A refrigerant cycle system includes: a first refrigerant circuit that includes a first heat exchanger, a first compressor, and a first cascade heat exchanger and that is configured as a first vapor compression refrigeration cycle; a second refrigerant circuit that includes the first cascade heat exchanger, a second compressor, and a second heat exchanger and that is configured as a second vapor compression refrigeration cycle; a first unit that accommodates the first heat exchanger and the first compressor; a second unit that accommodates the first cascade heat exchanger and the second compressor; and a third unit that accommodates the second heat exchanger. The first unit, the second unit, and the third unit are disposed apart from each other. The first cascade heat exchanger performs heat exchange between a first refrigerant that flows through the first refrigerant circuit and a second refrigerant that flows through the second refrigerant circuit.Type: GrantFiled: June 11, 2020Date of Patent: September 17, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Takuro Yamada, Atsushi Yoshimi, Eiji Kumakura, Ikuhiro Iwata, Kazuhiro Furusho, Mikio Kagawa, Michio Moriwaki, Tomoatsu Minamida, Hiromune Matsuoka, Junya Minami
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Patent number: 12066222Abstract: At a refrigeration cycle device, an injection pipe and an economizer heat exchanger are provided at a main refrigerant circuit. In addition, the refrigeration cycle device includes a sub-refrigerant circuit having a sub-usage-side heat exchanger. At the refrigeration cycle device, the sub-usage-side heat exchanger functions as an evaporator of a sub-refrigerant and cools a main refrigerant that has been cooled at the economizer heat exchanger, or functions as a radiator of the sub-refrigerant and heats the main refrigerant that has been cooled at the economizer heat exchanger.Type: GrantFiled: September 30, 2019Date of Patent: August 20, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Eiji Kumakura, Ikuhiro Iwata, Kazuhiro Furusho, Ryusuke Fujiyoshi, Hiromune Matsuoka
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Patent number: 12007150Abstract: Even if, in decompressing a refrigerant by an expansion mechanism, the temperature of the refrigerant cannot be sufficiently reduced, in order to increase the evaporation capacity of a use-side heat exchanger, a main expansion mechanism including an expansion element of a rotary or scroll type that causes power to be produced by decompressing a main refrigerant is provided at a main refrigerant circuit in which the main refrigerant circulates. Further, a sub-refrigerant circuit that differs from the main refrigerant circuit and in which a sub-refrigerant circulates is provided. A sub-use-side heat exchanger that is provided at the sub-refrigerant circuit and that functions as an evaporator of the sub-refrigerant is caused to function as a heat exchanger that cools the main refrigerant that flows between the main expansion mechanism and a main use-side heat exchanger.Type: GrantFiled: March 31, 2021Date of Patent: June 11, 2024Assignee: Daikin Industries, Ltd.Inventors: Ikuhiro Iwata, Eiji Kumakura, Kazuhiro Furusho, Ryusuke Fujiyoshi, Hiromune Matsuoka
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Patent number: 11994323Abstract: There is provided a refrigerant charging method in which a foreign material and moisture are avoided from entering a heat source unit until a refrigeration cycle apparatus is configured. The refrigerant charging method is a method of charging a refrigerant to a refrigerant circuit in which a refrigeration cycle is to be performed by a circulating refrigerant, the refrigerant circuit being configured by connecting a second heat source unit and a utilization unit to each other. The refrigerant charging method includes charging a first refrigerant to the second heat source unit before connecting the second heat source unit to the utilization unit to configure the refrigerant circuit, and connecting the second heat source unit to the utilization unit and charging a second refrigerant that differs from the first refrigerant to the refrigerant circuit to obtain the circulating refrigerant that includes the second refrigerant and the first refrigerant that is charged in the second heat source unit.Type: GrantFiled: September 20, 2019Date of Patent: May 28, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Takuro Yamada, Atsushi Yoshimi, Eiji Kumakura, Ikuhiro Iwata, Shun Ohkubo
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Patent number: 11988426Abstract: Efficiency in refrigerant charging work is addressed when a recovered refrigerant recovered from a first heat source unit is to be charged to a second heat source unit. A refrigerant charging method is a charging method used when 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 to be replaced with a second heat source unit. The refrigerant charging method includes recovering a first refrigerant from an already installed refrigeration cycle apparatus and obtaining a recovered refrigerant and charging the recovered refrigerant and charging a second refrigerant whose composition differs from the composition of the recovered refrigerant to the refrigeration cycle apparatus after renewal that includes the second heat source unit.Type: GrantFiled: September 20, 2019Date of Patent: May 21, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Takuro Yamada, Atsushi Yoshimi, Eiji Kumakura, Ikuhiro Iwata, Shun Ohkubo
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Patent number: 11976851Abstract: A refrigeration cycle device that includes a main refrigerant circuit and a sub-refrigerant circuit cools or heats a main refrigerant that flows between a main heat-source-side heat exchanger and a main usage-side heat exchanger by causing a sub-usage-side heat exchanger to function as an evaporator or a radiator of a sub-refrigerant. A first main expansion mechanism and a second main expansion mechanism that decompress the main refrigerant are provided on an upstream side and a downstream side of the sub-usage-side heat exchanger of the main refrigerant circuit.Type: GrantFiled: September 30, 2019Date of Patent: May 7, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Ikuhiro Iwata, Eiji Kumakura, Kazuhiro Furusho, Ryusuke Fujiyoshi, Hiromune Matsuoka
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Patent number: 11959667Abstract: A suction injection pipe and a subcooling heat exchanger are provided at a main refrigerant circuit in which a main refrigerant circulates. Further, a sub-refrigerant circuit that differs from the main refrigerant circuit and in which a sub-refrigerant circulates is provided. A controller performs control for switching between a cooling action of the subcooling heat-exchanger that cools the main refrigerant that is sent to a main use-side heat exchanger by using the suction injection pipe and the subcooling heat exchanger, and a cooling action of the sub-refrigerant-circuit that cools the main refrigerant that is sent to the main use-side heat exchanger by using the sub-refrigerant circuit.Type: GrantFiled: September 27, 2019Date of Patent: April 16, 2024Assignee: Daikin Industries, Ltd.Inventors: Ikuhiro Iwata, Eiji Kumakura, Kazuhiro Furusho, Ryusuke Fujiyoshi, Hiromune Matsuoka
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Patent number: 11906207Abstract: A two-stage refrigeration apparatus (500) includes a first cycle (510) and a second cycle (520). The first cycle (510) includes a first compressor (511), a first condenser (512), a first expansion mechanism (513), and a first evaporator (514) that are arranged in such a manner as to be connected to the first cycle. A first refrigerant circulates through the first cycle. The second cycle (520) includes a second downstream-side condenser (523) and a second evaporator (527) that are arranged in such a manner as to be connected to the second cycle. A second refrigerant circulates through the second cycle. The first evaporator (514) and the second downstream-side condenser (523) constitute a cascade condenser (531). In the cascade condenser (531), heat is exchanged between the first refrigerant and the second refrigerant. At least one of the first refrigerant and the second refrigerant is a refrigerant mixture containing at least 1,2-difluoroethylene (HFO-1132(E)).Type: GrantFiled: June 26, 2020Date of Patent: February 20, 2024Assignee: 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
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Publication number: 20240027105Abstract: A refrigeration cycle apparatus efficiently performs a cooling operation and a heating operation using a low-pressure refrigerant and a high-pressure refrigerant. A refrigeration cycle apparatus using a first refrigerant having 1 MPa or less at 30° C. and a second refrigerant having 1.5 MPa or more at 30° C. performs a heating operation by performing a two-stage refrigeration cycle including a use-side refrigeration cycle using the first refrigerant and a heat-source-side refrigeration cycle using the second refrigerant, and performs a cooling operation by performing a single-stage refrigeration cycle using the first refrigerant.Type: ApplicationFiled: September 29, 2023Publication date: January 25, 2024Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Atsushi YOSHIMI, Takuro YAMADA, Eiji KUMAKURA, Ikuhiro IWATA, Takeru MIYAZAKI, Hiroki UEDA, Masaki TANAKA, Masaki NAKAYAMA, Osamu TANAKA, Hirokazu FUJINO, Ryuhei KAJI
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Publication number: 20240027104Abstract: A refrigeration cycle apparatus includes a first refrigerant circuit and a second refrigerant circuit so as to improve the efficiency of operations. A first refrigerant circuit using a first refrigerant having a pressure of 1.2 MPa or less at 30° C. and a second refrigerant circuit using a second refrigerant having a pressure of 1.5 MPa or more at 30° C. are provided, and a dual cycle operation in which the first refrigerant circuit and the second refrigerant circuit are simultaneously operated to exchange heat between the first refrigerant and the second refrigerant and a single cycle operation in which the first refrigerant circuit is operated without operating the second refrigerant circuit to perform a cooling operation or heating operation are enabled in a switchable manner.Type: ApplicationFiled: September 28, 2023Publication date: January 25, 2024Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Hiroki IKARASHI, Atsushi YOSHIMI, Takuro YAMADA, Eiji KUMAKURA, Ikuhiro IWATA, Ryuhei KAJI, Takeru MIYAZAKI, Hiroki UEDA, Masaki TANAKA, Masaki NAKAYAMA, Hideho SAKAGUCHI, Osamu TANAKA, Hirokazu FUJINO
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Publication number: 20240019177Abstract: An air conditioner, which is a heat pump apparatus, includes a refrigerant circuit, a compressor, and a composition adjustment mechanism. The refrigerant circuit circulates a non-azeotropic mixture refrigerant including a first refrigerant and a second refrigerant having a boiling point higher than the first refrigerant. The compressor compresses the non-azeotropic mixture refrigerant. The first refrigerant is a compound represented by a molecular formula having one or more carbon-carbon unsaturated bonds. The composition adjustment mechanism is provided in the refrigerant circuit. The composition adjustment mechanism prevents an increase in the rate of the first refrigerant included in the non-azeotropic mixture refrigerant discharged from the compressor.Type: ApplicationFiled: September 28, 2023Publication date: January 18, 2024Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ikuhiro IWATA, Eiji KUMAKURA, Tetsushi TSUDA, Shinjiro DOMI, Atsushi YOSHIMI
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Publication number: 20240017595Abstract: A refrigeration cycle device for a vehicle includes a refrigerant circuit, in which a zeotropic refrigerant mixture is circulated, including a utilization heat exchanger including a first heat exchange portion and a second heat exchange portion disposed in series with the first heat exchange portion in a direction in which the zeotropic refrigerant mixture flows in the refrigerant circuit. The first heat exchange portion is disposed on an upstream side of the second heat exchange portion in a direction in which the zeotropic refrigerant mixture flows when the utilization heat exchanger functions as an evaporator of the zeotropic refrigerant mixture.Type: ApplicationFiled: September 28, 2023Publication date: January 18, 2024Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ikuhiro Iwata, Eiji Kumakura, Tetsushi Tsuda, Shinjiro Domi
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Publication number: 20240019178Abstract: A refrigeration cycle apparatus includes a main refrigerant circuit, a changer, and a controller. The main refrigerant circuit uses a non-azeotropic refrigerant mixture containing a first refrigerant and a second refrigerant. The changer changes a composition ratio between the first refrigerant and the second refrigerant in a refrigerant flowing through the main refrigerant circuit. The controller controls an operation of the changer. The controller executes a first mode and a second mode. The first mode is a mode in which the operation of the changing unit is controlled to cause substantially the second refrigerant alone to flow through the main refrigerant circuit. The second mode is a mode in which the operation of the changing unit is controlled to cause a refrigerant mixture of the first refrigerant and the second refrigerant to flow through the main refrigerant circuit.Type: ApplicationFiled: September 28, 2023Publication date: January 18, 2024Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Masaki TANAKA, Eiji KUMAKURA, Ikuhiro IWATA, Ryuhei KAJI, Atsushi YOSHIMI, Hiroki UEDA, Takuro YAMADA, Masaki NAKAYAMA
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Publication number: 20240019176Abstract: A refrigeration cycle apparatus efficiently performs a cooling operation and a heating operation using a low-pressure refrigerant and a high-pressure refrigerant. A refrigeration cycle apparatus performs a heating operation by performing a two-stage refrigeration cycle, the two-stage refrigeration cycle including a use-side refrigeration cycle using a first refrigerant having 1 MPa or less at 30° C. and a heat-source-side refrigeration cycle using a second refrigerant having 1.5 MPa or Imre at 30° C., and performs a cooling operation by performing a single-stage refrigeration cycle using the first refrigerant.Type: ApplicationFiled: September 29, 2023Publication date: January 18, 2024Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Atsushi YOSHIMI, Takuro YAMADA, Eiji KUMAKURA, Ikuhiro IWATA, Ryuhei KAJI, Takeru MIYAZAKI, Hiroki UEDA, Masaki TANAKA, Masaki NAKAYAMA
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Patent number: 11820933Abstract: A refrigeration cycle apparatus (10) includes a refrigerant circuit (11) including a compressor (12), a heat source-side heat exchanger (13), an expansion mechanism (14), and a usage-side heat exchanger (15). In the refrigerant circuit (11), a refrigerant containing at least 1,2-difluoroethylene (HFO-1132 (E)) is sealed. At least during a predetermined operation, in at least one of the heat source-side heat exchanger (13) and the usage-side heat exchanger (15), a flow of the refrigerant and a flow of a heating medium that exchanges heating with the refrigerant are counter flows.Type: GrantFiled: June 26, 2020Date of Patent: November 21, 2023Assignee: 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