Patents by Inventor Kohei Kasai
Kohei Kasai 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: 20220057122Abstract: A refrigeration cycle apparatus includes; an air heat exchanger; a first expansion valve; a water heat exchanger; a flow passage switching device provided to a discharge part of a compressor; an injection pipe branched from a branch portion of a refrigerant pipe connecting the water heat exchanger with the first expansion valve, and is connected to an injection port of the compressor; a second expansion valve provided to the injection pipe; and an internal heat exchanger configured to exchange heat between refrigerant flowing between the water heat exchanger and the branch portion and refrigerant flowing from the second expansion valve and the injection pipe. The branch portion is provided downstream of the internal heat exchanger and upstream of the first expansion valve in a flow direction of the refrigerant when the flow passage switching device is operated in the first state.Type: ApplicationFiled: March 6, 2019Publication date: February 24, 2022Inventor: Kohei KASAI
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Patent number: 10955176Abstract: An air-conditioning apparatus includes a controller configured to control operations of an outdoor fan. The controller has a voltage acquisition unit configured to acquire drive voltages of the outdoor fan at set time intervals while the rotation speed of the outdoor fan is maintained at a reference rotation speed, a determination unit configured to determine whether or not an acquired drive voltage is equal to or greater than a lower limit threshold and less than an upper limit threshold, an extraction unit configured to calculate an evaluation value by extracting a drive voltage determined to be equal to or greater than the lower limit threshold and less than the upper limit threshold, and a defrosting determination unit configured to decide to defrost the outdoor heat exchanger if the calculated evaluation value is equal to or greater than an evaluation threshold.Type: GrantFiled: January 12, 2016Date of Patent: March 23, 2021Assignee: Mitsubishi Electric CorporationInventors: Kohei Kasai, Yohei Kato, Satoru Yanachi, Hiroaki Asanuma
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Patent number: 10697677Abstract: A plate heat exchanger includes a plate stack including a plurality of heat transfer plates stacked with each other. Each of the heat transfer plates includes a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant. The heat transfer plates define heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, arranged alternately with one another. Each of the heat medium passages and the refrigerant passages is defined between adjacent ones of the heat transfer plates.Type: GrantFiled: December 11, 2015Date of Patent: June 30, 2020Assignee: Mitsubishi Electric CorporationInventors: Satoru Yanachi, Yohei Kato, Shinichi Uchino, Kohei Kasai, Tomoyoshi Obayashi, Kimitaka Kadowaki, Tetsuji Saikusa
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Publication number: 20190170412Abstract: A plate heat exchanger includes a plate stack including a plurality of heat transfer plates stacked with each other. Each of the heat transfer plates includes a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant. The heat transfer plates define heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, arranged alternately with one another. Each of the heat medium passages and the refrigerant passages is defined between adjacent ones of the heat transfer plates.Type: ApplicationFiled: December 11, 2015Publication date: June 6, 2019Inventors: Satoru YANACHI, Yohei KATO, Shinichi UCHINO, Kohei KASAI, Tomoyoshi OBAYASHI, Kimitaka KADOWAKI, Tetsuji SAIKUSA
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Publication number: 20180335236Abstract: An air-conditioning apparatus includes a controller configured to control operations of an outdoor fan. The controller has a voltage acquisition unit configured to acquire drive voltages of the outdoor fan at set time intervals while the rotation speed of the outdoor fan is maintained at a reference rotation speed, a determination unit configured to determine whether or not an acquired drive voltage is equal to or greater than a lower limit threshold and less than an upper limit threshold, an extraction unit configured to calculate an evaluation value by extracting a drive voltage determined to be equal to or greater than the lower limit threshold and less than the upper limit threshold, and a defrosting determination unit configured to decide to defrost the outdoor heat exchanger if the calculated evaluation value is equal to or greater than an evaluation threshold.Type: ApplicationFiled: January 12, 2016Publication date: November 22, 2018Applicant: Mitsubishi Electric CorporationInventors: Kohei KASAI, Yohei KATO, Satoru YANACHI, Hiroaki ASANUMA
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Publication number: 20170363332Abstract: An air-conditioning apparatus includes a fan configured to deliver air toward the outdoor heat exchanger, a power unit configured to supply electric power to the fan, a fan input detector configured to detect a physical value related to the electric power supplied to the fan, and a controller configured to control the four-way valve to switch between a first operation in which the outdoor heat exchanger functions as an evaporator and a second operation in which the outdoor heat exchanger functions as a condenser. The first operation is switched to the second operation when the physical value detected by the fan input detector is equal to or larger than a reference value. The controller adjusts the reference value so that the reference value when refrigerant flowing through the outdoor heat exchanger has a high temperature is smaller than the reference value when the refrigerant has a low temperature.Type: ApplicationFiled: February 18, 2015Publication date: December 21, 2017Inventors: Satoru YANACHI, Yohei KATO, Kohei KASAI, Shinichi UCHINO, Hirokazu MINAMISAKO, Takafumi MITO, Tsubasa TANDA
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Patent number: 7960089Abstract: A compound of the present invention is a compound represented by a general formula (A-1) [wherein, R? represents a hydrogen atom or an acid-dissociable, dissolution-inhibiting group, provided that at least one R? group is an acid-dissociable, dissolution-inhibiting group, R11 to R17 each represent an alkyl group of 1 to 10 carbon atoms or an aromatic hydrocarbon group, which may include a hetero atom within the structure; g and j each represent an integer of 1 or greater, and k and q each represent an integer of 0 or greater, provided that g+j+k+q is not greater than 5; a represents an integer from 1 to 3; b represents an integer of 1 or greater, and l and m each represent an integer of 0 or greater, provided that b+l+m is not greater than 4; c represents an integer of 1 or greater, and n and o each represent an integer of 0 or greater, provided that c+n+o is not greater than 4; and A represents a group represented by a general formula (Ia) shown below, a group represented by a general formula (Ib) shown beloType: GrantFiled: September 13, 2006Date of Patent: June 14, 2011Assignee: Tokyo Ohka Kogyo Co., Ltd.Inventors: Daiju Shiono, Takahiro Dazai, Taku Hirayama, Kohei Kasai, Hideo Hada
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Publication number: 20100183974Abstract: A compound of the present invention is a compound represented by a general formula (A-1) [wherein, R? represents a hydrogen atom or an acid-dissociable, dissolution-inhibiting group, provided that at least one R? group is an acid-dissociable, dissolution-inhibiting group, R11 to R17 each represent an alkyl group of 1 to 10 carbon atoms or an aromatic hydrocarbon group, which may include a hetero atom within the structure; g and j each represent an integer of 1 or greater, and k and q each represent an integer of 0 or greater, provided that g+j+k+q is not greater than 5; a represents an integer from 1 to 3; b represents an integer of 1 or greater, and l and m each represent an integer of 0 or greater, provided that b+l+m is not greater than 4; c represents an integer of 1 or greater, and n and o each represent an integer of 0 or greater, provided that c+n+o is not greater than 4; and A represents a group represented by a general formula (Ia) shown below, a group represented by a general formula (Ib) shown beloType: ApplicationFiled: September 13, 2006Publication date: July 22, 2010Applicant: Tokyo Ohka Kogyo Co., Ltd.Inventors: Daiju Shiono, Takahiro Dazai, Taku Hirayama, Kohei Kasai, Hideo Hada