Patents by Inventor Hirokazu Fujino
Hirokazu Fujino 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: 11913729Abstract: A heat exchanger includes: refrigerant channels that extend in a first direction, are disposed along a second direction intersecting with the first direction, and are disposed along a third direction intersecting with the first direction and the second direction; and heat transfer tubes defining the refrigerant channels. One or both of a size of an outer edge and a size of an inner edge of the heat transfer tubes are different between a first position and a second position in the first direction. Outer surfaces of the heat transfer tubes each include a protrusion that protrudes in a direction intersecting with the first direction, and is in contact with an outer surface of one of the heat transfer tubes adjacent thereto in the second direction. The protrusion includes a concave portion extending along the third direction.Type: GrantFiled: January 13, 2023Date of Patent: February 27, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Tooru Andou, Tomohiro Nagano, Hirokazu Fujino, Yoshiyuki Matsumoto
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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: 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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Patent number: 11859882Abstract: A refrigeration cycle apparatus uses a sensor that measures temperature of a plurality of refrigerant pipes in a contactless manner. A refrigeration cycle apparatus includes a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, an expansion mechanism, and a use-side heat exchanger are connected in sequence. The refrigeration cycle apparatus includes a temperature detector that detects temperatures at a plurality of points in a contactless manner, and a heat-source-side controller. At least one heat-source-side heat exchanger and the use-side heat exchanger includes a plurality of refrigerant pipes through which refrigerant to be heat-exchanged flows, and a flow rate adjuster. The flow rate adjuster adjusts flow rate of the refrigerant flowing through each of the plurality of refrigerant pipes. The temperature detector detects respective temperatures of the plurality of refrigerant pipes.Type: GrantFiled: September 20, 2022Date of Patent: January 2, 2024Assignee: Daikin Industries, Ltd.Inventors: Ryuhei Kaji, Hirokazu Fujino, Kazuhiro Furusho
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Patent number: 11828477Abstract: A heat exchanger includes: a surface with a water-repellent coating. The surface has a surface structure that includes protrusions. Condensed water droplets, each having a droplet diameter that allows a subcooled state to be maintained even under a predetermined freezing condition, combine with one other on the surface and generate an energy. The surface structure uses the energy to remove the combined condensed water droplets from the surface.Type: GrantFiled: March 30, 2018Date of Patent: November 28, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Tomohiro Nagano, Hirokazu Fujino, Kaori Yoshida, Isao Fujinami, Deb Kumar Mondal, Hiroki Yamaguchi
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Patent number: 11815316Abstract: A heat exchanger includes: a first layer including first flow channels that are microchannels and arranged to extend side by side; and a second layer that is laminated on the first layer and that includes second flow channels that are microchannels and arranged to extend side by side. A first one end-side collective flow channel is in fluid communication with first ends of the first flow channels. A first other end-side collective flow channel is in fluid communication with second ends of the first flow channels. A second one end-side collective flow channel is in fluid communication with first ends of the second flow channels. A second other end-side collective flow channel is in fluid communication with second ends of the second flow channels.Type: GrantFiled: August 10, 2022Date of Patent: November 14, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Yutaka Shibata, Tomoki Hirokawa, Hirokazu Fujino
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Patent number: 11698228Abstract: A shell-and-plate heat exchanger includes: a shell forming an internal space; and a plate stack, disposed in the internal space, including heat transfer plates that are stacked and joined together. The shell-and-plate heat exchanger is configured to allow a refrigerant that has flowed into the internal space to evaporate. The plate stack forms: refrigerant channels that communicate with the internal space and through which a refrigerant flows; and heating medium channels that are blocked from the internal space and through which a heating medium flows. Each of the refrigerant channels is adjacent to an associated one of the heating medium channels with one of the heat transfer plates interposed therebetween. The shell-and-plate heat exchanger further includes one or more supply structures that supply the refrigerant to the refrigerant channels such that the refrigerant flows downward.Type: GrantFiled: July 12, 2022Date of Patent: July 11, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Mitsuharu Numata, Kou Terai, Yutaka Shibata, Hirokazu Fujino
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Publication number: 20230168043Abstract: A heat exchanger includes: refrigerant channels that extend in a first direction, are disposed along a second direction intersecting with the first direction, and are disposed along a third direction intersecting with the first direction and the second direction; and heat transfer tubes defining the refrigerant channels. One or both of a size of an outer edge and a size of an inner edge of the heat transfer tubes are different between a first position and a second position in the first direction. Outer surfaces of the heat transfer tubes each include a protrusion that protrudes in a direction intersecting with the first direction, and is in contact with an outer surface of one of the heat transfer tubes adjacent thereto in the second direction. The protrusion includes a concave portion extending along the third direction.Type: ApplicationFiled: January 13, 2023Publication date: June 1, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Tooru Andou, Tomohiro Nagano, Hirokazu Fujino, Yoshiyuki Matsumoto
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Patent number: 11619427Abstract: A heat exchanger includes: first layers each including first flow channels that are microchannels; and second layers each including second flow channels that are microchannels. The first layers and the second layers constitute a lamination. Heat is exchanged by performing either of: liquid evaporation in the first flow channels and gas condensation in the second flow channels, or liquid evaporation in the second flow channels and gas condensation in the first flow channels. The lamination includes: a first liquid transport pore that is in fluid communication with the first flow channels; and a second liquid transport pore that is in fluid communication with the second flow channels.Type: GrantFiled: August 10, 2022Date of Patent: April 4, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Yutaka Shibata, Mitsuharu Numata, Tomoki Hirokawa, Hirokazu Fujino
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Publication number: 20230063016Abstract: A heat exchanger includes: a water-repellent coating film on part of a surface of the heat exchanger. The surface on which the water-repellent coating film is disposed includes a surface structure including protrusions. D/L<0.36, D/L>0.4×(L/H), D<200, L?D<1000, H>700, 0>1.28×D×10?2+2.77 ×(L?D)×10?3?1.1×D2×10?5?5.3×(L?D)2×10?7?9.8×D×(L?D)×10?6?2.0, and 90°<?<120°, where L is an average pitch of the protrusions in nm, D is an average diameter of the protrusions in nm, H is an average height of the protrusions in nm, and ? is a contact angle of water on a smooth plane of the water-repellent coating film.Type: ApplicationFiled: November 2, 2022Publication date: March 2, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Debukuma-ru Mondaru, Tomohiro Nagano, Hirokazu Fujino, Ken Satou, Kiyotaka Toyoyama, Takuya Ukai
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Publication number: 20230020557Abstract: A refrigeration cycle apparatus uses a sensor that measures temperature of a plurality of refrigerant pipes in a contactless manner. A refrigeration cycle apparatus includes a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, an expansion mechanism, and a use-side heat exchanger are connected in sequence. The refrigeration cycle apparatus includes a temperature detector that detects temperatures at a plurality of points in a contactless manner, and a heat-source-side controller. At least one heat-source-side heat exchanger and the use-side heat exchanger includes a plurality of refrigerant pipes through which refrigerant to be heat-exchanged flows, and a flow rate adjuster. The flow rate adjuster adjusts flow rate of the refrigerant flowing through each of the plurality of refrigerant pipes. The temperature detector detects respective temperatures of the plurality of refrigerant pipes.Type: ApplicationFiled: September 20, 2022Publication date: January 19, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuhei KAJI, Hirokazu FUJINO, Kazuhiro FURUSHO
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Patent number: 11549733Abstract: A heat exchanger includes heat transfer tubes and a header that forms a refrigerant flow path. The header includes: a first member that includes a first plate-shaped portion; a second member that includes a second plate-shaped portion; a third member that includes a third plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in a first direction that is a direction in which the first plate-shaped portion and the second plate-shaped portion are arranged; a fourth member that includes a fourth plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in the first direction and a second opening that constitutes a part of the refrigerant flow path, where a second is along a longitudinal direction of the second opening; and a fifth member.Type: GrantFiled: December 27, 2021Date of Patent: January 10, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Tomoki Hirokawa, Tooru Andou, Yoshiyuki Matsumoto, Hideyuki Kusaka, Hirokazu Fujino, Kouju Yamada
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Publication number: 20220381487Abstract: A heat exchanger includes: first layers each including first flow channels that are microchannels; and second layers each including second flow channels that are microchannels. The first layers and the second layers constitute a lamination. Heat is exchanged by performing either of: liquid evaporation in the first flow channels and gas condensation in the second flow channels, or liquid evaporation in the second flow channels and gas condensation in the first flow channels. The lamination includes: a first liquid transport pore that is in fluid communication with the first flow channels; and a second liquid transport pore that is in fluid communication with the second flow channels.Type: ApplicationFiled: August 10, 2022Publication date: December 1, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Yutaka Shibata, Mitsuharu Numata, Tomoki Hirokawa, Hirokazu Fujino
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Publication number: 20220381519Abstract: A heat exchanger includes: a first layer including first flow channels that are microchannels and arranged to extend side by side; and a second layer that is laminated on the first layer and that includes second flow channels that are microchannels and arranged to extend side by side. A first one end-side collective flow channel is in fluid communication with first ends of the first flow channels. A first other end-side collective flow channel is in fluid communication with second ends of the first flow channels. A second one end-side collective flow channel is in fluid communication with first ends of the second flow channels. A second other end-side collective flow channel is in fluid communication with second ends of the second flow channels.Type: ApplicationFiled: August 10, 2022Publication date: December 1, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Yutaka Shibata, Tomoki Hirokawa, Hirokazu Fujino
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Publication number: 20220341675Abstract: A shell-and-plate heat exchanger includes: a shell forming an internal space; and a plate stack, disposed in the internal space, including heat transfer plates that are stacked and joined together. The shell-and-plate heat exchanger is configured to allow a refrigerant that has flowed into the internal space to evaporate. The plate stack forms: refrigerant channels that communicate with the internal space and through which a refrigerant flows; and heating medium channels that are blocked from the internal space and through which a heating medium flows. Each of the refrigerant channels is adjacent to an associated one of the heating medium channels with one of the heat transfer plates interposed therebetween. The shell-and-plate heat exchanger further includes one or more supply structures that supply the refrigerant to the refrigerant channels such that the refrigerant flows downward.Type: ApplicationFiled: July 12, 2022Publication date: October 27, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Mitsuharu Numata, Kou Terai, Yutaka Shibata, Hirokazu Fujino
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Publication number: 20220341674Abstract: A shell-and-plate heat exchanger includes: a shell that forms an internal space and includes a refrigerant outlet at a top of the shell; and a plate stack disposed in the internal space and that includes heat transfer plates that are stacked and joined together. The shell-and-plate heat exchanger is configured to allow a refrigerant that has flowed into the internal space to evaporate. The refrigerant outlet emits a gas refrigerant out of the internal space through the refrigerant outlet. The plate stack forms: refrigerant channels that communicate with the internal space and through which a refrigerant flows; and heating medium channels that are blocked from the internal space and through which a heating medium flows. Each of the refrigerant channels is adjacent to an associated one of the heating medium channels with one of the heat transfer plates interposed therebetween.Type: ApplicationFiled: July 8, 2022Publication date: October 27, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Mitsuharu Numata, Yutaka Shibata, Kou Terai, Hirokazu Fujino
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Publication number: 20220333872Abstract: A shell and plate heat exchanger includes a shell forming an internal space, and a plate stack housed in the internal space. A plurality of refrigerant channels communicate with the internal space, and a plurality of heating medium channels are blocked from the internal space. Each of the refrigerant channels is adjacent to an associated one of the heating medium channels with heat transfer plate interposed between. Each of the heat transfer plates includes a first communication hole that communicates with the heating medium channels to introduce the heating medium, a second communication hole formed below the first communication hole that communicates with the heating medium channels to emit the heating medium, and a guide crossing between the first and second communication holes to guide the heating medium that has flowed into the heating medium channels from the first communication hole toward side portions of the heat transfer plate.Type: ApplicationFiled: July 5, 2022Publication date: October 20, 2022Inventors: Mitsuharu NUMATA, Kou TERAI, Yutaka SHIBATA, Hirokazu FUJINO
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Publication number: 20220178595Abstract: A liquid refrigerant distributor is used for a falling liquid film evaporator. The liquid refrigerant distributor includes a gas-liquid two-phase pipe through which a gas-liquid two-phase refrigerant flows, and a first refrigerant tub including a liquid reservoir section into which the gas-liquid two-phase refrigerant flows from the gas-liquid two-phase pipe. The first refrigerant tub further includes a droplet collector configured to collect droplets contained in a gas refrigerant separated by the liquid reservoir section.Type: ApplicationFiled: March 1, 2022Publication date: June 9, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Kou TERAI, Mitsuharu NUMATA, Yutaka SHIBATA, Hirokazu FUJINO
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Publication number: 20220120481Abstract: A heat exchanger includes heat transfer tubes and a header that forms a refrigerant flow path. The header includes: a first member that includes a first plate-shaped portion; a second member that includes a second plate-shaped portion; a third member that includes a third plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in a first direction that is a direction in which the first plate-shaped portion and the second plate-shaped portion are arranged; a fourth member that includes a fourth plate-shaped portion positioned between the first plate-shaped portion and the second plate-shaped portion in the first direction and a second opening that constitutes a part of the refrigerant flow path, where a second is along a longitudinal direction of the second opening; and a fifth member.Type: ApplicationFiled: December 27, 2021Publication date: April 21, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Tomoki Hirokawa, Tooru Andou, Yoshiyuki Matsumoto, Hideyuki Kusaka, Hirokazu Fujino, Kouju Yamada
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Patent number: 11137698Abstract: An image forming apparatus includes an image bearing member, a rotatable developer carrying member, a rotatable toner supplying member, and a toner accommodating unit. A developing unit including the developer carrying member and the toner accommodating unit are capable of being independently exchanged. The image forming apparatus further includes a current detector and a controller configured to execute a process for notifying information on a lifetime of the developing unit, on the basis of a detection result of the current detector at predetermined timing after use of a fresh toner accommodating unit is started.Type: GrantFiled: May 5, 2020Date of Patent: October 5, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Yosuke Kishi, Hirokazu Fujino, Masaki Hirose