Patents by Inventor Tomohiko Kasai

Tomohiko 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).

  • Patent number: 9829230
    Abstract: An air-conditioning apparatus has different two modes including a response detection diagnosis in which a control unit diagnoses a trouble of a component device during the trouble diagnosis operation based on presence or absence of a response from the operational state sensor when the mode has forcibly changed the device operation, and a performance detection diagnosis in which a trouble is detected by a detection value of the operational state sensor at a time when the operational state of the trouble diagnosis operation is stable, and the performance detection diagnosis is executed after the response detection diagnosis is executed.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: November 28, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shogo Tamaki, Kazuyoshi Shinozaki, Tomohiko Kasai
  • Patent number: 9459033
    Abstract: A correspondence determination operation is performed. The correspondence determination operation differs a direction of distribution or a flow rate of a refrigerant flowing in one or some of use units among a plurality of use units to that of the other use units and determines, on the basis of a refrigerant temperature of the use unit, a location of a non-correspondence between a branch port that is connected to the use unit with refrigerant pipes and a set branch port that is obtained in accordance with the wire connection.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: October 4, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shogo Tamaki, Fumitake Unezaki, Tomohiko Kasai
  • Patent number: 9322561
    Abstract: An air-conditioning apparatus includes a body casing of an indoor unit formed in a substantially rectangular parallelepiped shape. The body casing is formed with a body inlet port on a body bottom, and a body outlet port is formed in each body side. The body casing houses a centrifugal fan, a fan motor rotatably driving the centrifugal fan, and an indoor heat exchanger disposed so as to surround an outer periphery of the centrifugal fan in planar view. In each of the body outlet port, a joint is protrudingly provided with a body-side duct connecting portion that connects a duct thereto. Further, outlet ports are formed. The air-conditioning apparatus includes a plurality of outlet units each protrudingly provided with an outlet-side duct connecting portion that connects the duct thereto. Furthermore, at least one of the joints is formed with a plurality of the body-side duct connecting portions.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: April 26, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takashi Ikeda, Joseph Paul Bush, Takashi Okazaki, Tomohiko Kasai
  • Patent number: 9316421
    Abstract: An air-conditioning apparatus including a check valve in a passage between a first flow switching device and a suction side of a compressor, an expansion valve midway of a liquid extension piping, and an additional unit having a first bypass and a second bypass that are branched off from a passage between an indoor unit and the liquid expansion valve, and are connected to a passage between the check valve and the suction side of the compressor. The first bypass has, midway thereof, a first bypass expansion valve capable of controlling a throughput of refrigerant and an auxiliary heat exchanger that has a heat source different from the refrigerant, the auxiliary heat exchanger functioning as an evaporator heating the refrigerant flowing in the first bypass. The second bypass has, midway thereof, a second bypass expansion valve capable of controlling a throughput of refrigerant.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: April 19, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kosuke Tanaka, Tomohiko Kasai
  • Patent number: 9212825
    Abstract: 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: Grant
    Filed: November 17, 2008
    Date of Patent: December 15, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Wakamoto, Koji Yamashita, Takashi Okazaki, Naoki Tanaka, Keisuke Hokazono, Hiroyuki Morimoto, Yuji Motomura, Takeshi Hatomura, Tomohiko Kasai
  • Patent number: 9188376
    Abstract: Operation data of a refrigerant circuit is acquired after an initial refrigerant charge amount of refrigerant is charged in the refrigerant circuit and operation of the refrigerant circuit is started, an internal volume of a high-pressure pipe 6 is computed from the obtained operation data and the initial refrigerant charge amount input in a input unit 112, a target refrigerant charge amount is computed from the computed internal volume of the high-pressure pipe 6 and a standard operating state acquired in advance, the standard operating state being operation data of the refrigerant circuit when the refrigerant circuit is in a standard operating state that satisfies a preset condition, and an additional refrigerant charge amount is computed from the target refrigerant charge amount and the initial refrigerant charge amount.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: November 17, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shogo Tamaki, Fumitake Unezaki, Kazuyoshi Shinozaki, Tomohiko Kasai
  • Patent number: 8820106
    Abstract: A heat source-side refrigerant circuit A including a compressor 11, an outdoor heat exchanger 13, a first refrigerant branch portion 21 connected to the compressor 11, a second refrigerant branch portion 22 and a third refrigerant branch portion 23 connected to the outdoor heat exchanger 13, a first refrigerant flow rate control device 24 provided between branch piping 40 and the second refrigerant branch portion 22, intermediate heat exchangers 25n connected at one side thereof to the first refrigerant branch portion 21 and the third refrigerant branch portion 23 via three-way valves 26n and connected at the other side thereof to the second refrigerant branch portion 22, and second refrigerant flow rate control devices 27n provided between the respective intermediate heat exchangers 25n and the second refrigerant branch portion 22, and user-side refrigerant circuits Bn having indoor heat exchangers 31n connected respectively to the intermediate heat exchangers 25n are provided, and at least one of water and
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: September 2, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Wakamoto, Koji Yamashita, Takashi Okazaki, Naoki Tanaka, Keisuke Hokazono, Hiroyuki Morimoto, Yuji Motomura, Takeshi Hatomura, Tomohiko Kasai, Naofumi Takenaka, Yusuke Shimazu
  • Publication number: 20140238060
    Abstract: An air-conditioning apparatus has different two modes including a response detection diagnosis in which a control unit diagnoses a trouble of a component device during the trouble diagnosis operation based on presence or absence of a response from the operational state sensor when the mode has forcibly changed the device operation, and a performance detection diagnosis in which a trouble is detected by a detection value of the operational state sensor at a time when the operational state of the trouble diagnosis operation is stable, and the performance detection diagnosis is executed after the response detection diagnosis is executed.
    Type: Application
    Filed: February 28, 2013
    Publication date: August 28, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shogo TAMAKI, Kazuyoshi SHINOZAKI, Tomohiko KASAI
  • Publication number: 20140174114
    Abstract: Operation data of a refrigerant circuit is acquired after an initial refrigerant charge amount of refrigerant is charged in the refrigerant circuit and operation of the refrigerant circuit is started, an internal volume of a high-pressure pipe 6 is computed from the obtained operation data and the initial refrigerant charge amount input in a input unit 112, a target refrigerant charge amount is computed from the computed internal volume of the high-pressure pipe 6 and a standard operating state acquired in advance, the standard operating state being operation data of the refrigerant circuit when the refrigerant circuit is in a standard operating state that satisfies a preset condition, and an additional refrigerant charge amount is computed from the target refrigerant charge amount and the initial refrigerant charge amount.
    Type: Application
    Filed: December 20, 2012
    Publication date: June 26, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shogo TAMAKI, Fumitake UNEZAKI, Kazuyoshi SHINOZAKI, Tomohiko KASAI
  • Publication number: 20140033750
    Abstract: An air-conditioning apparatus including a check valve in a passage between a first flow switching device and a suction side of a compressor, an expansion valve midway of a liquid extension piping, and an additional unit having a first bypass and a second bypass that are branched off from a passage between an indoor unit and the liquid expansion valve, and are connected to a passage between the check valve and the suction side of the compressor. The first bypass has, midway thereof, a first bypass expansion valve capable of controlling a throughput of refrigerant and an auxiliary heat exchanger that has a heat source different from the refrigerant, the auxiliary heat exchanger functioning as an evaporator heating the refrigerant flowing in the first bypass. The second bypass has, midway thereof, a second bypass expansion valve capable of controlling a throughput of refrigerant.
    Type: Application
    Filed: August 2, 2012
    Publication date: February 6, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kosuke TANAKA, Tomohiko KASAI
  • Publication number: 20140033749
    Abstract: A correspondence determination operation is performed. The correspondence determination operation differs a direction of distribution or a flow rate of a refrigerant flowing in one or some of use units among a plurality of use units to that of the other use units and determines, on the basis of a refrigerant temperature of the use unit, a location of a non-correspondence between a branch port that is connected to the use unit with refrigerant pipes and a set branch port that is obtained in accordance with the wire connection.
    Type: Application
    Filed: August 2, 2012
    Publication date: February 6, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shogo TAMAKI, Fumitake Unezaki, Tomohiko Kasai
  • Publication number: 20130213614
    Abstract: An air-conditioning apparatus includes a body casing of an indoor unit formed in a substantially rectangular parallelepiped shape. The body casing is formed with a body inlet port on a body bottom, and a body outlet port is formed in each body side. The body casing houses a centrifugal fan, a fan motor rotatably driving the centrifugal fan, and an indoor heat exchanger disposed so as to surround an outer periphery of the centrifugal fan in planar view. In each of the body outlet port, a joint is protrudingly provided with a body-side duct connecting portion that connects a duct thereto. Further, outlet ports are formed. The air-conditioning apparatus includes a plurality of outlet units each protrudingly provided with an outlet-side duct connecting portion that connects the duct thereto. Furthermore, at least one of the joints is formed with a plurality of the body-side duct connecting portions.
    Type: Application
    Filed: February 17, 2012
    Publication date: August 22, 2013
    Applicants: MITSUBISHI ELECTRIC & ELECTRONICS USA, INC., MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takashi Ikeda, Joseph Paul Bush, Takashi Okazaki, Tomohiko Kasai
  • Patent number: 8015836
    Abstract: A heat pump system has a single heat source unit connected to at least one load unit to heat water to a high temperature. A hot water supply system 100 (heat pump system) includes a heat source unit 10 provided with a first compressor 11, a four-way selector valve 12 and a heat source heat exchanger 13, and a load unit 50 provided with a first flow controller 51, a first load heat exchanger 52, a second compressor 53, a second load heat exchanger 54, and a second flow controller 55. A main circuit A is formed by connecting the first compressor 11, the four-way selector valve 12, the heat source heat exchanger 13, the first flow controller 51 and the first load heat exchanger 52 with a liquid pipe 1 and a gas pipe 2 sequentially. A load refrigerant circuit B is formed by connecting the second compressor 53, the second load heat exchanger 54, the second flow controller 55, and the first load heat exchanger 52 with a load refrigerant pipe line 56 sequentially.
    Type: Grant
    Filed: March 27, 2007
    Date of Patent: September 13, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Junichi Kameyama, Tomohiko Kasai
  • Patent number: 7984620
    Abstract: An air conditioning apparatus has plural indoor units having: plural heat exchangers; and flow controllers respectively corresponding to the heat exchangers. In each of the indoor units, one heat exchanger is used as a condenser, and another heat exchanger is used as an evaporator, thereby causing the indoor unit to perform a temperature and humidity controlling operation. An indoor unit(s) which is not set to perform the temperature and humidity controlling operation may be caused to perform a heating operation or a cooling operation. Capacity controls on the condensers and the evaporators are performed by corresponding flow controllers. Gas refrigerants ejected from plural heat exchangers serving as evaporators are joined together, and then distributed to plural heat exchangers serving as condensers.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: July 26, 2011
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Daisuke Shimamoto, Munehiro Yamanaka, Hidekazu Tani, Tomohiko Kasai, Masahiro Tsuda, Shuji Oura, Makoto Saitou
  • Publication number: 20110113802
    Abstract: 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: Application
    Filed: November 17, 2008
    Publication date: May 19, 2011
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shinichi Wakamoto, Koji Yamashita, Takashi Okazaki, Naoki Tanaka, Keisuke Hokazono, Hiroyuki Morimoto, Yuji Motomura, Takeshi Hatomura, Tomohiko Kasai
  • Publication number: 20110088421
    Abstract: A heat source-side refrigerant circuit A including a compressor 11, an outdoor heat exchanger 13, a first refrigerant branch portion 21 connected to the compressor 11, a second refrigerant branch portion 22 and a third refrigerant branch portion 23 connected to the outdoor heat exchanger 13, a first refrigerant flow rate control device 24 provided between branch piping 40 and the second refrigerant branch portion 22, intermediate heat exchangers 25n connected at one side thereof to the first refrigerant branch portion 21 and the third refrigerant branch portion 23 via three-way valves 26n and connected at the other side thereof to the second refrigerant branch portion 22, and second refrigerant flow rate control devices 27n provided between the respective intermediate heat exchangers 25n and the second refrigerant branch portion 22, and user-side refrigerant circuits Bn having indoor heat exchangers 31n connected respectively to the intermediate heat exchangers 25n are provided, and at least one of water and
    Type: Application
    Filed: October 29, 2008
    Publication date: April 21, 2011
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shinichi Wakamoto, Koji Yamashita, Takashi Okazaki, Naoki Tanaka, Keisuke Hokazono, Hiroyuki Morimoto, Yuji Motomura, Takeshi Hatomura, Tomohiko Kasai, Naofumi Takenaka, Yusuke Shimazu
  • Publication number: 20100050675
    Abstract: A heat pump system has a single heat source unit connected to at least one load unit to heat water to a high temperature. A hot water supply system 100 (heat pump system) includes a heat source unit 10 provided with a first compressor 11, a four-way selector valve 12 and a heat source heat exchanger 13, and a load unit 50 provided with a first flow controller 51, a first load heat exchanger 52, a second compressor 53, a second load heat exchanger 54, and a second flow controller 55. A main circuit A is formed by connecting the first compressor 11, the four-way selector valve 12, the heat source heat exchanger 13, the first flow controller 51 and the first load heat exchanger 52 with a liquid pipe 1 and a gas pipe 2 sequentially. A load refrigerant circuit B is formed by connecting the second compressor 53, the second load heat exchanger 54, the second flow controller 55, and the first load heat exchanger 52 with a load refrigerant pipe line 56 sequentially.
    Type: Application
    Filed: March 27, 2007
    Publication date: March 4, 2010
    Applicant: Mitsubishi Electric Corporation
    Inventors: Junichi Kameyama, Tomohiko Kasai
  • Publication number: 20090145151
    Abstract: An air conditioner including an outdoor unit, indoor units, and a relay device for connection between the outdoor unit and each of the indoor units. The outdoor unit includes an outdoor heat exchanger, a compressor for pressurizing a refrigerant of or including carbon dioxide, and a first switching member for switching flow direction of the refrigerant through the outdoor heat exchanger. Each of the indoor units includes an indoor heat exchanger and first flow controller in fluid communication between first and second pipe connection ports. The relay device includes second switching members, each of the second switching members selectively connecting the first pipe connection port of a respective indoor unit with the first or second connection end of the outdoor unit.
    Type: Application
    Filed: November 1, 2005
    Publication date: June 11, 2009
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Shinichi Wakamoto, Tomohiko Kasai, Jiro Okajima, Toshiyuki Nakamura, Kunio Tojo, Takashi Okazaki, Toshihiko Enomoto
  • Patent number: 7493775
    Abstract: An air conditioning apparatus has plural indoor units having: plural heat exchangers; and flow controllers respectively corresponding to the heat exchangers. In each of the indoor units, one heat exchanger is used as a condenser, and another heat exchanger is used as an evaporator, thereby causing the indoor unit to perform a temperature and humidity controlling operation. An indoor unit(s) which is not set to perform the temperature and humidity controlling operation may be caused to perform a heating operation or a cooling operation. Capacity controls on the condensers and the evaporators are performed by corresponding flow controllers. Gas refrigerants ejected from plural heat exchangers serving as evaporators are joined together, and then distributed to plural heat exchangers serving as condensers.
    Type: Grant
    Filed: October 30, 2002
    Date of Patent: February 24, 2009
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Daisuke Shimamoto, Munehiro Yamanaka, Hidekazu Tani, Tomohiko Kasai, Masahiro Tsuda, Shuji Oura, Makoto Saitou
  • Publication number: 20080196432
    Abstract: An air conditioning apparatus has plural indoor units having: plural heat exchangers; and flow controllers respectively corresponding to the heat exchangers. In each of the indoor units, one heat exchanger is used as a condenser, and another heat exchanger is used as an evaporator, thereby causing the indoor unit to perform a temperature and humidity controlling operation. An indoor unit(s) which is not set to perform the temperature and humidity controlling operation may be caused to perform a heating operation or a cooling operation. Capacity controls on the condensers and the evaporators are performed by corresponding flow controllers. Gas refrigerants ejected from plural heat exchangers serving as evaporators are joined together, and then distributed to plural heat exchangers serving as condensers.
    Type: Application
    Filed: April 23, 2008
    Publication date: August 21, 2008
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Daisuke SHIMAMOTO, Munehiro Yamanaka, Hidekazu Tani, Tomohiko Kasai, Masahiro Tsuda, Shuji Oura, Makoto Saitou