Patents by Inventor Keisuke Hokazono
Keisuke Hokazono 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: 11397011Abstract: An air-sending device includes a propeller fan, a bell mouth surrounding an outer periphery of the propeller fan, a fan grille disposed downstream of the bell mouth and including a plurality of first crosspieces. An edge of the air outlet of the bell mouth includes a varying portion whose distance from a rotation axis of the propeller fan varies. In a cross-section of any of the plurality of first crosspieces that is perpendicular to a longitudinal direction of the any of the plurality of first crosspieces, a virtual line segment connecting an upstream side end portion and a downstream side end portion is defined as a first virtual line segment. At the portions of the plurality of first crosspieces disposed on the inner circumference side of the varying portion, the angle between a virtual line segment parallel to the rotation axis and the first virtual line segment is changed.Type: GrantFiled: June 4, 2018Date of Patent: July 26, 2022Assignee: Mitsubishi Electric CorporationInventors: Takahide Tadokoro, Yasuaki Kato, Keisuke Hokazono
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Publication number: 20210164670Abstract: An air-sending device includes a propeller fan, a bell mouth surrounding an outer periphery of the propeller fan, a fan grille disposed downstream of the bell mouth and including a plurality of first crosspieces. An edge of the air outlet of the bell mouth includes a varying portion whose distance from a rotation axis of the propeller fan varies. In a cross-section of any of the plurality of first crosspieces that is perpendicular to a longitudinal direction of the any of the plurality of first crosspieces, a virtual line segment connecting an upstream side end portion and a downstream side end portion is defined as a first virtual line segment. At the portions of the plurality of first crosspieces disposed on the inner circumference side of the varying portion, the angle between a virtual line segment parallel to the rotation axis and the first virtual line segment is changed.Type: ApplicationFiled: June 4, 2018Publication date: June 3, 2021Inventors: Takahide TADOKORO, Yasuaki KATO, Keisuke HOKAZONO
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Patent number: 10760832Abstract: An air-conditioning apparatus includes a main circuit in which a compressor, a refrigerant flow switching device, a load side heat exchanger, a load side expansion device, and a plurality of heat source side heat exchangers are sequentially connected. When the plurality of heat source side heat exchangers are used as condensers, the first heat source side heat exchanger and the second heat source side heat exchanger are connected in series. When the plurality of heat source side heat exchangers are used as evaporators, the first heat source side heat exchanger and the second heat source side heat exchanger are connected in parallel. A distribution adjustment header on an inlet side of at least either the first heat source side heat exchanger or the second heat source side heat exchanger when the plurality of heat source side heat exchangers are used as evaporators.Type: GrantFiled: May 24, 2017Date of Patent: September 1, 2020Assignee: Mitsubishi Electric CorporationInventors: Takeshi Hatomura, Keisuke Hokazono, Yutaka Aoyama, Shuhei Mizutani, Takuya Matsuda, Ryota Akaiwa, Yoji Onaka
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Patent number: 10746418Abstract: An outdoor unit including a compressor is configured to compress refrigerant, a heat source-side air sending device is configured to suck air, a heat source-side heat exchanger is configured to exchange heat between the refrigerant and the air, and a controller is configured to control the compressor, the heat source-side air sending device, and the heat source-side heat exchanger, in which the heat source-side air sending device is provided in an upper part of the outdoor unit, the controller is provided in a lower part of the outdoor unit, the heat source-side heat exchanger is provided along outer peripheral side surfaces of the outdoor unit, and a part of the heat source-side heat exchanger is provided along a working plane used by an engineer for maintenance work and is provided above the controller.Type: GrantFiled: November 4, 2016Date of Patent: August 18, 2020Assignee: Mitsubishi Electric CorporationInventors: Yuya Morishita, Hiroyuki Morimoto, Keisuke Hokazono
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Patent number: 10422566Abstract: An air-conditioning apparatus, including: a heat source-side heat exchanger including a plurality of heat transfer tubes each having a flattened shape and being arranged in parallel, the heat source-side heat exchanger being used at least as a condenser of a refrigeration cycle; and an outdoor fan for generating flows of air passing through the heat source-side heat exchanger in a predetermined air velocity distribution. The heat source-side heat exchanger is configured to exchange heat between the air and refrigerant flowing through the heat transfer tubes and includes a plurality of refrigerant paths, each including at least one of the plurality of heat transfer tubes and a plurality of two-phase paths for allowing gas refrigerant to flow into and out as two-phase refrigerant; and a plurality of liquid-phase paths for allowing the two-phase refrigerant flowing out of the plurality of two-phase paths to flow out as subcooled liquid refrigerant.Type: GrantFiled: June 13, 2013Date of Patent: September 24, 2019Assignee: Mitsubishi Electric CorporationInventors: Keisuke Hokazono, Yutaka Aoyama, Kosuke Tanaka, Takuya Matsuda
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Publication number: 20190162454Abstract: An air-conditioning apparatus includes a main circuit in which a compressor, a refrigerant flow switching device, a load side heat exchanger, a load side expansion device, and a plurality of heat source side heat exchangers are sequentially connected. When the plurality of heat source side heat exchangers are used as condensers, the first heat source side heat exchanger and the second heat source side heat exchanger are connected in series. When the plurality of heat source side heat exchangers are used as evaporators, the first heat source side heat exchanger and the second heat source side heat exchanger are connected in parallel. A distribution adjustment header on an inlet side of at least either the first heat source side heat exchanger or the second heat source side heat exchanger when the plurality of heat source side heat exchangers are used as evaporators.Type: ApplicationFiled: May 24, 2017Publication date: May 30, 2019Applicant: Mitsubishi Electric CorporationInventors: Takeshi HATOMURA, Keisuke HOKAZONO, Yutaka AOYAMA, Shuhei MIZUTANI, Takuya MATSUDA, Ryota AKAIWA, Yoji ONAKA
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Publication number: 20180274799Abstract: An outdoor unit including a compressor is configured to compress refrigerant, a heat source-side air sending device is configured to suck air, a heat source-side heat exchanger is configured to exchange heat between the refrigerant and the air, and a controller is configured to control the compressor, the heat source-side air sending device, and the heat source-side heat exchanger, in which the heat source-side air sending device is provided in an upper part of the outdoor unit, the controller is provided in a lower part of the outdoor unit, the heat source-side heat exchanger is provided along outer peripheral side surfaces of the outdoor unit, and a part of the heat source-side heat exchanger is provided along a working plane used by an engineer for maintenance work and is provided above the controller.Type: ApplicationFiled: November 4, 2016Publication date: September 27, 2018Inventors: Yuya MORISHITA, Hiroyuki MORIMOTO, Keisuke HOKAZONO
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Patent number: 9791189Abstract: A heat exchanger is configured such that flat tubes in at least two levels bent or connected to each other at one end in an axial direction of the flat tubes and the flat tubes in at least two columns connected to each other are included in refrigerant passages through which refrigerant flows, and a flow direction of gas is counter to flow of refrigerant through the refrigerant passages in a column direction while the heat exchanger serves as a condenser.Type: GrantFiled: May 8, 2013Date of Patent: October 17, 2017Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Shigeyoshi Matsui, Takuya Matsuda, Keisuke Hokazono, Hiroki Okazawa, Takashi Okazaki, Akira Ishibashi, Atsushi Mochizuki
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Patent number: 9733025Abstract: A flat heat transfer tube is used for a cross fin tube type heat exchanger including the flat heat transfer tube having a bending portion and a plurality of holes extending in a direction parallel with an axis direction of the flat heat transfer tube, and a plurality of plate fins bonded by welding to the flat heat transfer tube, wherein an interval between an outer surface of the flat heat transfer tube and an inner surface of the hole of a portion which is curved with a small curvature during bending is larger than an interval between an outer surface of the flat heat transfer tube and an inner surface of the hole of a portion which is curved with a large curvature during bending in a cross section of a portion of the flat heat transfer tube which corresponds to the bending portion before bending.Type: GrantFiled: November 13, 2012Date of Patent: August 15, 2017Assignee: Mitsubishi Electric CorporationInventor: Keisuke Hokazono
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Patent number: 9677790Abstract: A multi-room air-conditioning apparatus includes an outdoor unit, a relay unit connected to an outdoor unit by first and second connection pipes, and a plurality of indoor units connected to the relay unit. The outdoor unit includes a second gas-liquid separating device provided on the suction side of the compressor. The suction side of the compressor and the second gas-liquid separating device are connected to each other by a gas-side outlet pipe and a liquid-side outlet pipe.Type: GrantFiled: May 14, 2012Date of Patent: June 13, 2017Assignee: Mitsubishi Electric CorporationInventors: Mizuo Sakai, Soshi Ikeda, Hiroaki Nakamune, Susumu Yoshimura, Naofumi Takenaka, Hiroki Okazawa, Keisuke Hokazono, Osamu Morimoto
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Publication number: 20160187049Abstract: An air-conditioning apparatus, including: a heat source-side heat exchanger including a plurality of heat transfer tubes each having a flattened shape and being arranged in parallel, the heat source-side heat exchanger being used at least as a condenser of a refrigeration cycle; and an outdoor fan for generating flows of air passing through the heat source-side heat exchanger in a predetermined air velocity distribution. The heat source-side heat exchanger is configured to exchange heat between the air and refrigerant flowing through the heat transfer tubes and includes a plurality of refrigerant paths, each including at least one of the plurality of heat transfer tubes and a plurality of two-phase paths for allowing gas refrigerant to flow into and out as two-phase refrigerant; and a plurality of liquid-phase paths for allowing the two-phase refrigerant flowing out of the plurality of two-phase paths to flow out as subcooled liquid refrigerant.Type: ApplicationFiled: June 13, 2013Publication date: June 30, 2016Inventors: Keisuke HOKAZONO, Yutaka AOYAMA, Kosuke TANAKA, Takuya MATSUDA
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Publication number: 20160054038Abstract: A heat exchanger is configured such that flat tubes in at least two levels bent or connected to each other at one end in an axial direction of the flat tubes and the flat tubes in at least two columns connected to each other are included in refrigerant passages through which refrigerant flows, and a flow direction of gas is counter to flow of refrigerant through the refrigerant passages in a column direction while the heat exchanger serves as a condenser.Type: ApplicationFiled: May 8, 2013Publication date: February 25, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shigeyoshi MATSUI, Takuya MATSUDA, Keisuke HOKAZONO, Hiroki OKAZAWA, Takashi OKAZAKI, Akira ISHIBASHI, Atsushi MOCHIZUKI
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Publication number: 20150362222Abstract: A refrigerant distribution device is provided for distributing refrigerant to a plurality of heat transfer tubes that constitute a heat exchanger. The refrigerant distribution device includes a first distribution device dividing refrigerant into a plurality of portions, and a plurality of two-way branch pipes each dividing refrigerant divided by the first distribution device into two portions to flow into two of the plurality of heat transfer tubes.Type: ApplicationFiled: January 22, 2013Publication date: December 17, 2015Applicant: Mitsubishi Electric CorporationInventors: Takuya MATSUDA, Keisuke HOKAZONO, Hiroki OKAZAWA, Wataru SUZUKI, Takashi NAKAJIMA, Atsushi MOCHIZUKI
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Patent number: 9212825Abstract: A multi-chamber air conditioner including a heat-source side refrigerant circuit in which a compressor, an outdoor heat exchanger, a first heat exchanger, a refrigerant flow-rate controller, and a second heat exchanger are connected in series, a first use-side refrigerant circuit in which the first heat exchanger and an indoor heat exchanger are connected in series, and a second use-side refrigerant circuit in which the second heat exchanger and the indoor heat exchanger are connected in series, and a heat-source side refrigerant circulating in the heat-source side refrigerant circuit and a use-side refrigerant circulating in the use-side refrigerant circuit are heat-exchanged in the first heat exchanger. The heat-source side refrigerant circulating in the heat-source side refrigerant circuit and the use-side refrigerant circulating in the use-side refrigerant circuit are heat-exchanged in the second heat exchanger.Type: GrantFiled: November 17, 2008Date of Patent: December 15, 2015Assignee: Mitsubishi Electric CorporationInventors: Shinichi Wakamoto, Koji Yamashita, Takashi Okazaki, Naoki Tanaka, Keisuke Hokazono, Hiroyuki Morimoto, Yuji Motomura, Takeshi Hatomura, Tomohiko Kasai
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Publication number: 20150285567Abstract: A flat heat transfer tube is used for a cross fin tube type heat exchanger including the flat heat transfer tube having a bending portion and a plurality of holes extending in a direction parallel with an axis direction of the flat heat transfer tube, and a plurality of plate fins bonded by welding to the flat heat transfer tube, wherein an interval between an outer surface of the flat heat transfer tube and an inner surface of the hole of a portion which is curved with a small curvature during bending is larger than an interval between an outer surface of the flat heat transfer tube and an inner surface of the hole of a portion which is curved with a large curvature during bending in a cross section of a portion of the flat heat transfer tube which corresponds to the bending portion before bending.Type: ApplicationFiled: November 13, 2012Publication date: October 8, 2015Applicant: MITSUBISHI ELECTRIC CORPORATIONInventor: Keisuke Hokazono
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Patent number: 9115917Abstract: An air-conditioner capable of suppressing increase in the suction temperature of a compressor is provided. The air-conditioner according to the present invention has a refrigerant circuit in which a compressor, an oil separator, a heat source side heat exchanger, a throttle device, and a use side heat exchanger are connected in series, an oil returning circuit that connects the oil separator with the suction side of the compressor, and a decompression mechanism provided in the oil return circuit. The oil return circuit is installed by piping so as to exchange heat with a part of the heat source side heat exchanger at the upstream side of the decompression mechanism.Type: GrantFiled: January 27, 2009Date of Patent: August 25, 2015Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Keisuke Hokazono, Yutaka Aoyama
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Publication number: 20150135756Abstract: A multi-room air-conditioning apparatus includes an outdoor unit, a relay unit connected to an outdoor unit by first and second connection pipes, and a plurality of indoor units connected to the relay unit. The outdoor unit includes a second gas-liquid separating device provided on the suction side of the compressor. The suction side of the compressor and the second gas-liquid separating device are connected to each other by a gas-side outlet pipe and a liquid-side outlet pipe.Type: ApplicationFiled: May 14, 2012Publication date: May 21, 2015Applicant: Mitsubishi Electric CorporationInventors: Mizuo Sakai, Soshi Ikeda, Hiroaki Nakamune, Susumu Yoshimura, Naofumi Takenaka, Hiroki Okazawa, Keisuke Hokazono, Osamu Morimoto
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Patent number: D749201Type: GrantFiled: January 31, 2013Date of Patent: February 9, 2016Assignee: Mitsubishi Electric CorporationInventors: Keisuke Hokazono, Nobuaki Miyake, Wataru Suzuki, Hiroki Okazawa
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Patent number: D763417Type: GrantFiled: January 31, 2013Date of Patent: August 9, 2016Assignee: Mitsubishi Electric CorporationInventors: Keisuke Hokazono, Nobuaki Miyake, Wataru Suzuki, Hiroki Okazawa
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Patent number: D775315Type: GrantFiled: January 31, 2013Date of Patent: December 27, 2016Assignee: Mitsubishi Electric CorporationInventors: Keisuke Hokazono, Nobuaki Miyake, Wataru Suzuki, Hiroki Okazawa