Patents by Inventor Tsubasa TANDA
Tsubasa TANDA 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: 11435117Abstract: An air-conditioning apparatus includes a refrigerant circuit in which a compressor, a flow passage switching device, an outdoor heat exchanger, an indoor heat exchanger, a refrigerant container, a first expansion device and a second expansion device connected by pipes, wherein the indoor heat exchanger and the outdoor heat exchanger have inner volumes satisfying a relationship of an inner volume of the indoor heat exchanger<an inner volume of the outdoor heat exchanger, and a controller which, performs control so as to allow the flow passage switching device to switch the flow passage to the heating flow passage and allow an opening degree of the second expansion device to be larger than that of the first expansion device, starts the compressor, performs control so as to allow the opening degrees of the first expansion device and the second expansion device to be initial opening degrees for the cooling operation.Type: GrantFiled: October 10, 2017Date of Patent: September 6, 2022Assignee: Mitsubishi Electric CorporationInventor: Tsubasa Tanda
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Patent number: 11193678Abstract: An outdoor unit for an air-conditioning apparatus includes a heat exchanger; a bottom plate; and a separation member configured to separate the bottom plate and the heat exchanger. The bottom plate includes a drainage passage that protrudes downward; and one or more drainage holes each formed to protrude downward from the drainage passage. The drainage passage includes a drainage surface inclined downward toward the one drain hole having a width larger than a width of the heat exchanger. The separation member is formed of a metal electrically less noble than a member forming the heat exchanger, or a resin member. The separation member is provided in the drainage passage and shaped to prevent closing of the drainage passage, in which a height to a surface on which the heat exchanger is placed is larger than a height to an upper surface of the drainage passage.Type: GrantFiled: November 29, 2016Date of Patent: December 7, 2021Assignee: Mitsubishi Electric CorporationInventors: Yohei Kato, Tsubasa Tanda, Yudai Sakabe, Motoki Otsuka
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Patent number: 10883745Abstract: A refrigeration cycle apparatus includes a refrigerant circuit which allows refrigerant to circulate therethrough, and an outdoor heat exchanger which exchanges heat between the refrigerant and outdoor air. The outdoor heat exchanger has first to third heat exchange sections. The second heat exchange section is located below the first heat exchange section, and the third heat exchange section is located below the second heat exchange section. In a refrigerant passage connecting the second and third heat exchange sections, a first pressure reducing device reduces a pressure of the refrigerant flowing through the refrigerant passage. In an operation mode in which the first and second heat exchange sections each serve as an evaporator, the third heat exchange section is located upstream of the second heat exchange section in the flow of the refrigerant, and refrigerant having a temperature higher than that of the outdoor air flows through the third heat exchange section.Type: GrantFiled: June 27, 2016Date of Patent: January 5, 2021Assignee: Mitsubishi Electric CorporationInventors: Shinya Higashiiue, Ryota Akaiwa, Shin Nakamura, Yohei Kato, Tsubasa Tanda
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Patent number: 10816227Abstract: An outdoor unit for an air-conditioning apparatus that includes a bottom plate made of metal, an L-shaped heat exchanger made of metal different than the metal of the bottom plate, a placement plate provided on the bottom plate and having a heat exchanger placement surface on which the heat exchanger is placed. The placement plate having an L-shape in plan view, and the placement plate is held in contact with the bottom plate only below each of a short-side end portion of the placement plate, a long-side end portion of the placement plate, and a corner portion of the placement plate.Type: GrantFiled: July 25, 2016Date of Patent: October 27, 2020Assignee: Mitsubishi Electric CorporationInventors: Motoki Otsuka, Yohei Kato, Yudai Sakabe, Tsubasa Tanda, Masaharu Miwa
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Patent number: 10801791Abstract: Provided is a heat exchanger that is capable of avoiding a bridge phenomenon caused by water droplets between a plurality of flat tubes and is easily manufactured. The heat exchanger includes a plurality of plate-like fins arranged in parallel at intervals, the plurality of flat tubes inserted into the plurality of plate-like fins, and at least one water-guiding member arranged between adjacent ones of the plurality of flat tubes projecting from at least one of both outermost ones of the plurality of plate-like fins and having both end portions held in contact with projecting flat surfaces of the adjacent ones of the plurality of flat tubes.Type: GrantFiled: July 29, 2015Date of Patent: October 13, 2020Assignee: Mitsubishi Electric CorporationInventors: Tsubasa Tanda, Yohei Kato
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Publication number: 20200248915Abstract: An air-conditioning apparatus includes a refrigerant circuit in which a compressor, a flow passage switching device, an outdoor heat exchanger, an indoor heat exchanger, a refrigerant container, a first expansion device and a second expansion device connected by pipes, wherein the indoor heat exchanger and the outdoor heat exchanger have inner volumes satisfying a relationship of an inner volume of the indoor heat exchanger<an inner volume of the outdoor heat exchanger, and a controller which, performs control so as to allow the flow passage switching device to switch the flow passage to the heating flow passage and allow an opening degree of the second expansion device to be larger than that of the first expansion device, starts the compressor, performs control so as to allow the opening degrees of the first expansion device and the second expansion device to be initial opening degrees for the cooling operation.Type: ApplicationFiled: October 10, 2017Publication date: August 6, 2020Inventor: Tsubasa TANDA
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Patent number: 10712023Abstract: An outdoor unit for an air-conditioning apparatus is configured to suppress damage on hairpin portions at an end portion of an outdoor heat exchanger due to freezing. The outdoor unit includes: an air passage defined inside a casing; an outdoor heat exchanger, which is installed in the air passage, and includes a plurality of heat exchange portions; an outdoor unit fan configured to introduce air into the outdoor heat exchanger; and an air passage blocking object installed in the air passage, and configured to block air flow. The outdoor heat exchanger includes: a heat transfer tube configured to allow refrigerant to pass therein; and a fin connected to the heat transfer tube. The heat transfer tube includes a hairpin portion, which is bent and folded back and to which no fin is connected. The air passage blocking object is configured to cover the hairpin portion.Type: GrantFiled: June 7, 2016Date of Patent: July 14, 2020Assignee: Mitsubishi Electric CorporationInventors: Yohei Kato, Tsubasa Tanda, Shin Nakamura, Akira Ishibashi
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Patent number: 10648681Abstract: A bellmouth of a heat source unit includes: a straight tubular portion having a cylindrical shape; an air inlet portion which is radially expanded toward the upstream side, wherein, the air inlet portion has at least one angle-reduced portion that satisfies ?0>?i>0, where, an angle formed by a line L1 and a line L2 is taken as ?0, and an angle formed by a straight line L3 and the line L2 is taken as ?i, the line L1 is a line passing through a portion of an outer peripheral end portion of the air inlet portion, the line L2 is a line passing through a connecting portion between the air inlet portion and the straight tubular portion, and the straight line L3 is a line connecting an intersection P of the line L1 and the line L2 and a portion of the outer peripheral end portion of the air inlet portion.Type: GrantFiled: July 19, 2016Date of Patent: May 12, 2020Assignee: Mitsubishi Electric CorporationInventors: Katsuyuki Yamamoto, Seiji Nakashima, Yohei Kato, Tsubasa Tanda
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Patent number: 10627175Abstract: A heat exchanger includes a plate fin, a first flat tube intersecting with the plate fin, and a second flat tube opposed to a flat tube lower surface of the first flat tube, the second flat tube being spaced from the first flat tube and arranged so as to intersect with the plate fin. A flat tube windward lateral surface of the first and second flat tubes is located on an inner side of a peripheral edge of the plate fin, which includes an elevated portion formed between the first and second flat tubes and is located between a first imaginary plane, connecting the flat tube windward lateral surface of the first and second flat tubes, and a second imaginary plane, connecting a center of the flat tube lower surface of the first flat tube and a center of the flat tube upper surface of the second flat tube.Type: GrantFiled: May 29, 2015Date of Patent: April 21, 2020Assignee: Mitsubishi Electric CorporationInventors: Shin Nakamura, Akira Ishibashi, Sangmu Lee, Satoshi Ueyama, Tsubasa Tanda
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Publication number: 20200080733Abstract: An outdoor unit for an air-conditioning apparatus includes a heat exchanger; a bottom plate; and a separation member configured to separate the bottom plate and the heat exchanger, the bottom plate including: a drainage passage that protrudes downward; and one or a plurality of drainage holes each formed to protrude downward from the drainage passage, the drainage passage including a drainage surface inclined downward toward the one drain hole having a width larger than a width of the heat exchanger, the separation member being formed of a metal electrically less noble than a member forming the heat exchanger, or a resin member, the separation member provided in the drainage passage and shaped to prevent closing of the drainage passage, in which a height to a surface on which the heat exchanger is placed is larger than a height to an upper surface of the drainage passage.Type: ApplicationFiled: November 29, 2016Publication date: March 12, 2020Inventors: Yohei KATO, Tsubasa TANDA, Yudai SAKABE, Motoki OTSUKA
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Publication number: 20200072517Abstract: In a heat source-side unit according to the present invention, a temperature sensor is installed on an inter-column connecting part included in a plurality of inter-column connecting parts and located higher than an intermediate position in a vertical direction of a heat exchanger.Type: ApplicationFiled: January 24, 2017Publication date: March 5, 2020Inventors: Yohei KATO, Tsubasa TANDA, Masahiro TAKAMURA, Yudai SAKABE
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Publication number: 20190331352Abstract: An outdoor unit for an air-conditioning apparatus is configured to suppress damage on hairpin portions at an end portion of an outdoor heat exchanger due to freezing. The outdoor unit includes: an air passage defined inside a casing; an outdoor heat exchanger, which is installed in the air passage, and includes a plurality of heat exchange portions; an outdoor unit fan configured to introduce air into the outdoor heat exchanger; and an air passage blocking object installed in the air passage, and configured to block air flow. The outdoor heat exchanger includes: a heat transfer tube configured to allow refrigerant to pass therein; and a fin connected to the heat transfer tube. The heat transfer tube includes a hairpin portion, which is bent and folded back and to which no fin is connected. The air passage blocking object is configured to cover the hairpin portion.Type: ApplicationFiled: June 7, 2016Publication date: October 31, 2019Inventors: Yohei KATO, Tsubasa TANDA, Shin NAKAMURA, Akira ISHIBASHI
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Patent number: 10393452Abstract: A heat exchanger includes a fin having a plate shape and including a first region where a plurality of cutout portions are formed with intervals in a longitudinal direction that is a gravity direction, and a second region where the plurality of cutout portions are not formed in the longitudinal direction, and flat tubes attached to the plurality of cutout portions and intersecting the fin. Protruding portions protruding from a planar portion of the fin are formed on the fin, and the protruding portions each have a shape in which a first end is located in the first region and a second end is located in the second region and below the first end.Type: GrantFiled: May 29, 2015Date of Patent: August 27, 2019Assignee: Mitsubishi Electric CorporationInventors: Shin Nakamura, Akira Ishibashi, Tomohiko Takahashi, Hidenari Ogata, Ryo Terashima, Junichi Ono, Satoshi Ueyama, Yohei Kato, Tsubasa Tanda, Kenichi Kitani
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Publication number: 20190137146Abstract: A refrigeration cycle apparatus includes a refrigerant circuit which allows refrigerant to circulate therethrough, and an outdoor heat exchanger which is provided to the refrigerant circuit and exchanges heat between the refrigerant and outdoor air. The outdoor heat exchanger has first to third heat exchange sections. The second heat exchange section is located below the first heat exchange section, and connected thereto. The the third heat exchange section is located below the second heat exchange section, and connected thereto. In a refrigerant passage connecting the second and third heat exchange sections, a first pressure reducing device is provided, and reduces a pressure of the refrigerant flowing through the refrigerant passage.Type: ApplicationFiled: June 27, 2016Publication date: May 9, 2019Applicant: Mitsubishi Electric CorporationInventors: Shinya HIGASHIIUE, Ryota AKAIWA, Shin NAKAMURA, Yohei KATO, Tsubasa TANDA
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Publication number: 20190137118Abstract: In an all-aluminum heat exchanger using aluminum as a material of a refrigerant pipe, a dissimilar metal contact with a bottom plate, which is made of iron, of an outdoor unit increases a risk of corrosion of the refrigerant pipe. An outdoor unit for an air-conditioning apparatus includes a placement plate, which is provided on a bottom plate of a casing and has a heat exchanger placement surface having a planar shape on which the heat exchanger is placed. With this configuration, water and dust generated in the casing can be caused to drop from the heat exchanger placement surface to the bottom plate and discharged to an outside of the casing. As a result, even when the all-aluminum heat exchanger is used as a heat exchanger of an air-conditioning apparatus, leakage of refrigerant can be prevented.Type: ApplicationFiled: July 25, 2016Publication date: May 9, 2019Inventors: Motoki OTSUKA, Yohei KATO, Yudai SAKABE, Tsubasa TANDA, Masaharu MIWA
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Publication number: 20190137120Abstract: A bellmouth of a heat source unit includes: a straight tubular portion having a cylindrical shape; an air inlet portion which is radially expanded toward the upstream side, the air inlet portion has at least one angle-reduced portion that satisfies ?0>?i>0, where, an angle formed by a line L1 and a line L2 is taken as ?0, and an angle formed by a straight line L3 and the line L2 is taken as ?i, the line L1 is a line passing through a portion of an outer peripheral end portion of the air inlet portion, the line L2 is a line passing through a connecting portion between the air inlet portion and the straight tubular portion, and the straight line L3 is a line connecting an intersection P of the line L1 and the line L2 and a portion of the outer peripheral end portion of the air inlet portion.Type: ApplicationFiled: July 19, 2016Publication date: May 9, 2019Inventors: Katsuyuki YAMAMOTO, Seiji NAKASHIMA, Yohei KATO, Tsubasa TANDA
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Patent number: 10082344Abstract: Provided are rectangular plate-like fins 2 layered at intervals; and flat tubes 3 which are perpendicularly extended through the layered plate-like fins 2 and are provided on multiple levels along a longitudinal direction of the plate-like fins 2. The plate-like fins 2 are provided with at least one heat transfer promoting section 6 that is positioned in a region between adjacently-positioned flat tubes 3 and in which ridge sections 4 and valley sections 5 having ridgelines extending in the longitudinal direction of the plate-like fins 2 are arranged to alternate. En the heat transfer promoting section 6, at least one slit 7 allowing communication between a front and a back of the plate-like fin 2 is formed on a downwind side of the ridge sections 4.Type: GrantFiled: March 2, 2015Date of Patent: September 25, 2018Assignee: Mitsubishi Electric CoporationInventors: Tsubasa Tanda, Akira Ishibashi, Shin Nakamura, Satoshi Ueyama, Aya Kawashima
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Publication number: 20180135926Abstract: Provided is a heat exchanger that is capable of avoiding a bridge phenomenon caused by water droplets between a plurality of flat tubes and is easily manufactured. The heat exchanger includes a plurality of plate-like fins arranged in parallel at intervals, the plurality of flat tubes inserted into the plurality of plate-like fins, and at least one water-guiding member arranged between adjacent ones of the plurality of flat tubes projecting from at least one of both outermost ones of the plurality of plate-like fins and having both end portions held in contact with projecting flat surfaces of the adjacent ones of the plurality of flat tubes.Type: ApplicationFiled: July 29, 2015Publication date: May 17, 2018Inventors: Tsubasa TANDA, Yohei KATO
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Publication number: 20180120039Abstract: A heat exchanger includes a fin having a plate shape and including a first region where a plurality of cutout portions are formed with intervals in a longitudinal direction that is a gravity direction, and a second region where the plurality of cutout portions are not formed in the longitudinal direction, and flat tubes attached to the plurality of cutout portions and intersecting the fin. Protruding portions protruding from a planar portion of the fin are formed on the fin, and the protruding portions each have a shape in which a first end is located in the first region and a second end is located in the second region and below the first end.Type: ApplicationFiled: May 29, 2015Publication date: May 3, 2018Inventors: Shin NAKAMURA, Akira ISHIBASHI, Tomohiko TAKAHASHI, Hidenari OGATA, Ryo TERASHIMA, Junichi ONO, Satoshi UEYAMA, Yohei KATO, Tsubasa TANDA, Kenichi KITANI
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Publication number: 20180106563Abstract: A heat exchanger includes a plate fin, a first flat tube intersecting with the plate fin, and a second flat tube opposed to a flat tube lower surface of the first flat tube, the second flat tube being spaced from the first flat tube and arranged so as to intersect with the plate fin. A flat tube windward lateral surface of the first and second flat tubes is located on an inner side of a peripheral edge of the plate fin, which includes an elevated portion formed between the first and second flat tubes and is located between a first imaginary plane, connecting the flat tube windward lateral surface of the first and second flat tubes, and a second imaginary plane, connecting a center of the flat tube lower surface of the first flat tube and a center of the flat tube upper surface of the second flat tube.Type: ApplicationFiled: May 29, 2015Publication date: April 19, 2018Inventors: Shin NAKAMURA, Akira ISHIBASHI, Sangmu LEE, Satoshi UEYAMA, Tsubasa TANDA