Patents by Inventor Daisuke Karube
Daisuke Karube 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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Patent number: 11920077Abstract: No studies have been made regarding what kinds of refrigerants should be used in a refrigeration cycle device for a vehicle. An air conditioner (1) for a vehicle includes a refrigerant circuit (10) and a refrigerant that is sealed in the refrigerant circuit (10). The refrigerant circuit (10) includes a compressor (80), a first heat exchanger (85), which serves as a heat dissipater in a dehumidifying heating mode, an outside-air heat exchanger (82), a cooling control valve (87), and a second heat exchanger (86), which serves as an evaporator in the dehumidifying heating mode. The refrigerant is a refrigerant having a low GWP.Type: GrantFiled: July 16, 2019Date of Patent: March 5, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Eiji Kumakura, Kazuhiro Furusho, Masaru Tanaka, Shun Ohkubo, Mitsushi Itano, Yuuki Yotsumoto, Akihito Mizuno, Tomoyuki Gotou, Yasufu Yamada, Tatsumi Tsuchiya, Kenji Gobou, Hitomi Kuroki, Daisuke Karube, Tatsuya Takakuwa, Tetsushi Tsuda
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Patent number: 11912922Abstract: A showcase includes a refrigerant circuit and a refrigerant enclosed in the refrigerant circuit. The refrigerant circuit includes a compressor (121), a radiator (122), an expansion valve (123), and an evaporator (124). The refrigerant is a low-GWP refrigerant.Type: GrantFiled: July 16, 2019Date of Patent: February 27, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Shinichi Fujinaka, Masaru Tanaka, Shun Ohkubo, Mitsushi Itano, Yuuki Yotsumoto, Akihito Mizuno, Tomoyuki Gotou, Yasufu Yamada, Hitomi Kuroki, Tatsumi Tsuchiya, Kenji Gobou, Daisuke Karube, Tatsuya Takakuwa
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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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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
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Publication number: 20230323179Abstract: An object is to provide a novel low-GWP mixed refrigerant. As a solution to achieve the object, a composition containing a refrigerant that contains 1,1-difluoroethylene (HFO-1132a), difluoromethane (R32), and 1,3,3,3-tetrafluoropropene (R1234ze) is provided.Type: ApplicationFiled: June 13, 2023Publication date: October 12, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Mitsushi ITANO, Shun OHKUBO, Daisuke KARUBE
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Publication number: 20230257333Abstract: The present disclosure provides a method for producing a composition comprising a purified fluorine-containing ether compound represented by formula (1): CHX1X2CF2OX3, wherein X1 and X2 are the same or different and each represents a hydrogen atom, a fluorine atom, or a trifluoromethyl group, and X3 represents a C1-6 alkyl group, provided that not both X1 and X2 are trifluoromethyl groups.Type: ApplicationFiled: April 18, 2023Publication date: August 17, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke KARUBE, Kenta NISHIMURA, Yuuki SUZUKI, Tsubasa NAKAUE, Yoshichika KUROKI, Michiaki OKADA
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Publication number: 20230151257Abstract: An object is to provide a novel low-GWP mixed refrigerant. Provided is a composition comprising a refrigerant, the refrigerant comprising difluoromethane (R32), trans-1,2-difluoroethylene (HFO-1132(E)), 1,3,3,3-tetrafluoropropene (R1234ze), and 1,1-difluoroethylene (HFO-1132a).Type: ApplicationFiled: January 19, 2023Publication date: May 18, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Mitsushi ITANO, Shun OHKUBO, Daisuke KARUBE, Satoshi TOKUNO
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Publication number: 20230132359Abstract: A refrigeration cycle apparatus (1) is capable of performing a refrigeration cycle using a small-GWP refrigerant. The refrigeration cycle apparatus (1) includes a refrigerant circuit (10) and a refrigerant enclosed in the refrigerant circuit (10). The refrigerant circuit includes a compressor (21), a condenser (23), a decompressing section (24), and an evaporator (31). The refrigerant contains is a small-GWP refrigerant.Type: ApplicationFiled: July 16, 2019Publication date: April 27, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Eiji KUMAKURA, Takuro YAMADA, Atsushi YOSHIMI, Ikuhiro IWATA, Yoshinari ASANO, Keisuke OHTSUKA, Keiji AOTA, Mitsushi ITANO, Shun OHKUBO, Tatsuya TAKAKUWA, Daisuke KARUBE, Yuuki YOTSUMOTO, Kenji GOBOU, Hitomi KUROKI, Tomoyuki GOTOU, Akihito MIZUNO, Yasufu YAMADA, Tatsumi TSUCHIYA, Yuuichi YANAGI, Yoshikazu NAKAO, Takeo ABE, Yumi TODA, Tetsushi TSUDA
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Publication number: 20230117208Abstract: In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. In the air conditioner (1), a compressor (100, 200) can be driven without interposing a power conversion device between an AC power source (90, 190) and a motor (70, 170). Thus, it is possible to provide the air conditioner (1) that is environmentally friendly and has a relatively inexpensive configuration.Type: ApplicationFiled: December 9, 2022Publication date: April 20, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Keisuke OHTSUKA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Tetsushi TSUDA
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Publication number: 20230097829Abstract: A refrigeration cycle apparatus (1) is capable of performing a refrigeration cycle using a small-GWP refrigerant. The refrigeration cycle apparatus (1) includes a refrigerant circuit (10) and a refrigerant enclosed in the refrigerant circuit (10). The refrigerant circuit includes a compressor (21), a condenser (23), a decompressing section (24), and an evaporator (31). The refrigerant contains at least 1,2-difluoroethylene.Type: ApplicationFiled: November 21, 2022Publication date: March 30, 2023Applicant: 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, Keisuke OHTSUKA, Yuuichi YANAGI, Takeo ABE, Yumi TODA, Tetsushi TSUDA
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Publication number: 20230048615Abstract: The present disclosure provides a composition containing (A) 1,1,1,3,3,3-hexafluoroisopropyl methyl ether (HFE-356mmz) and/or 1,1,2,3,3,3-hexafluoropropyl methyl ether (HFE-356mec), and (B) a fluorine oil.Type: ApplicationFiled: October 28, 2022Publication date: February 16, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Tsubasa NAKAUE, Daisuke KARUBE, Asako YOSHIYAMA
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Publication number: 20230029441Abstract: No studies have been made regarding what kinds of refrigerants should be used in a refrigeration cycle device for a vehicle. An air conditioner (1) for a vehicle includes a refrigerant circuit (10) and a refrigerant that is sealed in the refrigerant circuit (10). The refrigerant circuit (10) includes a compressor (80), a first heat exchanger (85), which serves as a heat dissipater in a dehumidifying heating mode, an outside-air heat exchanger (82), a cooling control valve (87), and a second heat exchanger (86), which serves as an evaporator in the dehumidifying heating mode. The refrigerant is a refrigerant having a low GWP.Type: ApplicationFiled: July 16, 2019Publication date: January 26, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Eiji KUMAKURA, Kazuhiro FURUSHO, Masaru TANAKA, Shun OHKUBO, Mitsushi ITANO, Yuuki YOTSUMOTO, Akihito MIZUNO, Tomoyuki GOTOU, Yasufu YAMADA, Tatsumi TSUCHIYA, Kenji GOBOU, Hitomi KUROKI, Daisuke KARUBE, Tatsuya TAKAKUWA, Tetsushi TSUDA
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Patent number: 11549695Abstract: A heat exchange unit is provided with which, even if a flammable refrigerant is used, the likelihood of the refrigerant reaching an electric component unit is reduced. An outdoor unit (20) constitutes a portion of an air-conditioning apparatus (1), and is connected to an indoor unit (30) via a liquid-side refrigerant connection pipe (6) and a gas-side refrigerant connection pipe (5). The outdoor unit (20) includes an outdoor housing (50), an outdoor heat exchanger (23) disposed inside the outdoor housing (50) and in which a refrigerant flows, a liquid-side shutoff valve (29) connected to the liquid-side refrigerant connection pipe (6), a gas-side shutoff valve (28) connected to the gas-side refrigerant connection pipe (5), and an outdoor electric component unit (8) disposed inside the outdoor housing (50). The refrigerant is a flammable refrigerant containing at least 1,2-difluoroethylene.Type: GrantFiled: June 25, 2020Date of Patent: January 10, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Mitsushi Itano, Daisuke Karube, Yuuki Yotsumoto, Kazuhiro Takahashi, Tatsuya Takakuwa, Yuzo Komatsu, Shun Ohkubo, Tetsushi Tsuda, Yumi Toda, Takeo Abe
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Patent number: 11549041Abstract: An object is to provide a mixed refrigerant having three types of performance, i.e., a refrigerating capacity that is equivalent to that of R410A, a sufficiently low GWP, and a lower flammability (Class 2L) according to the ASHRAE standard. Provided is a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), wherein when the mass % of HFO-1132(E), R32, and R1234yf based on their sum in the refrigerant is respectively represented by x, y, and z, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132(E), R32, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments AC, CF, FD, and DA that connect the following 4 points: point A (71.1, 0.0, 28.9), point C (36.5, 18.2, 45.3), point F (47.6, 18.3, 34.1), and point D (72.0, 0.0, 28.0), or on these line segments; the line segment AC is represented by coordinates (0.0181y2?2.2288y+71.Type: GrantFiled: June 26, 2020Date of Patent: January 10, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Mitsushi Itano, Daisuke Karube, Yuuki Yotsumoto, Kazuhiro Takahashi
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Publication number: 20230002659Abstract: An object is to provide a mixed refrigerant having three types of performance, i.e., a refrigerating capacity that is equivalent to that of R410A, a sufficiently low GWP, and a lower flammability (Class 2L) according to the ASHRAE standard. Provided is a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), wherein when the mass % of HFO-1132(E), R32, and R1234yf based on their sum in the refrigerant is respectively represented by x, y, and z, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132(E), R32, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments AC, CF, FD, and DA that connect the following 4 points: point A (71.1, 0.0, 28.9), point C (36.5, 18.2, 45.3), point F (47.6, 18.3, 34.1), and point D (72.0, 0.0, 28.0), or on these line segments; the line segment AC is represented by coordinates (0.0181y2?2.2288y+71.Type: ApplicationFiled: August 12, 2022Publication date: January 5, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI
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Patent number: 11542216Abstract: Provided is a method for obtaining HFO-1132(E) and/or HFO-1132(Z) efficiently. The method is a method for producing HFO-1132(E) and/or HFO-1132(Z), comprising supplying a composition containing HFO-1132(E) and/or HFO-1132(Z) to a reactor, and performing an isomerization reaction between HFO-1132(E) and HFO-1132(Z).Type: GrantFiled: September 13, 2021Date of Patent: January 3, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Tatsuya Takakuwa, Osamu Yamamoto, Daisuke Karube
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Patent number: 11535781Abstract: A refrigeration cycle apparatus (1) is capable of performing a refrigeration cycle using a small-GWP refrigerant. The refrigeration cycle apparatus (1) includes a refrigerant circuit (10) and a refrigerant enclosed in the refrigerant circuit (10). The refrigerant circuit includes a compressor (21), a condenser (23), a decompressing section (24), and an evaporator (31). The refrigerant contains at least 1,2-difluoroethylene.Type: GrantFiled: December 18, 2018Date of Patent: December 27, 2022Assignee: 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, Keisuke Ohtsuka, Yoshinari Asano, Keiji Aota, Yuuichi Yanagi, Yoshikazu Nakao, Takeo Abe, Yumi Toda, Tetsushi Tsuda
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Publication number: 20220404070Abstract: In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. The motor rotation rate of a compressor (100) can be changed in accordance with an air conditioning load, and thus a high annual performance factor (APF) can be achieved. In addition, an electrolytic capacitor is not required on an output side of a rectifier circuit (21), and thus an increase in the size and cost of the circuit is suppressed.Type: ApplicationFiled: August 22, 2022Publication date: December 22, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Keisuke OHTSUKA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Tetsushi TSUDA
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Publication number: 20220389299Abstract: There is provided a refrigeration cycle apparatus in which good lubricity can be achieved when a refrigeration cycle is performed using a refrigerant having a sufficiently low GWP. The refrigeration cycle apparatus contains a refrigerating oil and a refrigerant composition containing a refrigerant containing trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and 2,3,3,3-tetrafluoro-1-propene (R1234yf).Type: ApplicationFiled: June 25, 2021Publication date: December 8, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Yuzo KOMATSU, Shun OHKUBO, Tatsuya TAKAKUWA, Tetsushi TSUDA, Takeo ABE, Yumi TODA
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Publication number: 20220380649Abstract: Provided is a refrigerant composition having two types of performance, i.e., a coefficient of performance that is equivalent to that of R410A and a sufficiently low GWP. Provided is a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132 (E)), trifluoroethylene (HFO-1123), and difluoromethane (R32) at specific concentrations.Type: ApplicationFiled: August 3, 2022Publication date: December 1, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI