Patents by Inventor Takahiro Ushijima
Takahiro Ushijima 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: 10816224Abstract: A heat-pump air-conditioning hot-water supply device includes a first refrigerant passage connecting a compressor and a decompressor, a second refrigerant passage branching from between the compressor and a first solenoid valve and connecting a second solenoid valve, a hot-water supply heat exchanger, and the decompressor, a pressure sensor configured to measure discharge pressure of the compressor, and a control device configured to adjust an operational frequency of the compressor and adjust an opening degree of a valve of the decompressor. The control device is configured to calculate a condensing temperature from the discharge pressure, and perform operation in one of an air conditioning prioritized mode in which a preset operational frequency of the compressor is changed, and an energy saving prioritized mode in which the opening degree of the valve of the decompressor is changed, when the condensing temperature is not lower than a set condensing temperature.Type: GrantFiled: May 26, 2016Date of Patent: October 27, 2020Assignee: Mitsubishi Electric CorporationInventor: Takahiro Ushijima
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Publication number: 20190072284Abstract: A heat-pump air-conditioning hot-water supply device includes a first refrigerant passage connecting a compressor and a decompressor, a second refrigerant passage branching from between the compressor and a first solenoid valve and connecting a second solenoid valve, a hot-water supply heat exchanger, and the decompressor, a pressure sensor configured to measure discharge pressure of the compressor, and a control device configured to adjust an operational frequency of the compressor and adjust an opening degree of a valve of the decompressor. The control device is configured to calculate a condensing temperature from the discharge pressure, and perform operation in one of an air conditioning prioritized mode in which a preset operational frequency of the compressor is changed, and an energy saving prioritized mode in which the opening degree of the valve of the decompressor is changed, when the condensing temperature is not lower than a set condensing temperature.Type: ApplicationFiled: May 26, 2016Publication date: March 7, 2019Inventor: Takahiro USHIJIMA
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Patent number: 10047992Abstract: A low-cost and highly-efficient air-conditioning system including an AHU using refrigerant of a heat pump cycle as a heat source, and capable of reducing an on/off cycle operation of compressors at a time of a low load, the system including: a plurality of outdoor units; an air handling unit; a plurality of independent heat pump cycles formed by connecting the plurality of outdoor units and the air handling unit by refrigerant pipes, each of the plurality of independent heat pump cycles including a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger; and a number control unit controlling, to satisfy a capacity demand corresponding to an air-conditioning load, based on a particular frequency range associated with the compressor, in which a certain compressor efficiency or more is obtained, a number of the compressors in operation and operating frequencies of the respective compressors in operation.Type: GrantFiled: October 9, 2015Date of Patent: August 14, 2018Assignee: Mitsubishi Electric CorporationInventor: Takahiro Ushijima
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Patent number: 9920967Abstract: The hot and cold water air conditioning system includes a water temperature sensor configured to detect a temperature of water flowing out of the heat pump heat source apparatus by an operation of the water circulation pump, and a controller configured to perform, in a heating operation, on/off normal control that turns on a compressor when the water temperature detected by the water temperature sensor becomes lower than a target water temperature and turns off the compressor when the water temperature becomes higher than a first temperature value higher than the target water temperature, and to switch from the on/off normal control, upon repeating the on/off operation of the compressor at a minimum frequency necessary for an operation of the compressor in the on/off normal control, to on/off restriction control that turns on the compressor when the water temperature becomes lower than a second temperature value lower than the target water temperature and turns off the compressor when the water temperature beType: GrantFiled: October 17, 2014Date of Patent: March 20, 2018Assignee: Mitsubishi Electric CorporationInventor: Takahiro Ushijima
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Patent number: 9500376Abstract: When using a plurality of heaters such as heat pump units, capacity is properly distributed according to the required capacity, thereby enabling highly efficient operation of a hot water system. To achieve this, a control apparatus determines the heating capacity of each of the heat pump units in a way that the total heating capacity of the heat pump units reaches the heating capacity required in the hot water system as a whole, and further in a way that the total COP (coefficient of performance) of the heat pump units satisfies predetermined condition. The control apparatus controls each of regulating valves in a way that the heating capacity of each of the heat pump units reaches the above determined heating capacity.Type: GrantFiled: March 30, 2009Date of Patent: November 22, 2016Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Hirokazu Minamisako, Shinichi Uchino, Kengo Takahashi, Ryo Oya, Kazuki Okada, Takahiro Ushijima
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Publication number: 20160161165Abstract: A low-cost and highly-efficient air-conditioning system including an AHU using refrigerant of a heat pump cycle as a heat source, and capable of reducing an on/off cycle operation of compressors at a time of a low load, the system including: a plurality of outdoor units; an air handling unit; a plurality of independent heat pump cycles formed by connecting the plurality of outdoor units and the air handling unit by refrigerant pipes, each of the plurality of independent heat pump cycles including a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger; and a number control unit controlling, to satisfy a capacity demand corresponding to an air-conditioning load, based on a particular frequency range associated with the compressor, in which a certain compressor efficiency or more is obtained, a number of the compressors in operation and operating frequencies of the respective compressors in operation.Type: ApplicationFiled: October 9, 2015Publication date: June 9, 2016Inventor: Takahiro USHIJIMA
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Patent number: 9291376Abstract: An auxiliary heater control device can be readily attached to a hot water heating system configured with a simple water circuit without a hot water storage tank, and is capable of preventing freezing of circulating water such that use of an auxiliary heater is minimized. When a sensed temperature tS sensed by a temperature sensor is in a range, a control device increases a rotational speed of a circulation pump. When the sensed temperature tS is in a range, the control device increases the rotational speed of the circulation pump and lowers an operating frequency of a compressor. When the sensed temperature tS is in a range, the control device increases the rotational speed of the circulation pump, lowers the operating frequency of the compressor, and activates an auxiliary heater.Type: GrantFiled: November 25, 2009Date of Patent: March 22, 2016Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro Ushijima, Kazutaka Suzuki, Koji Matsuzawa, Nobuaki Uehara
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Publication number: 20150135750Abstract: The hot and cold water air conditioning system includes a water temperature sensor configured to detect a temperature of water flowing out of the heat pump heat source apparatus by an operation of the water circulation pump, and a controller configured to perform, in a heating operation, on/off normal control that turns on a compressor when the water temperature detected by the water temperature sensor becomes lower than a target water temperature and turns off the compressor when the water temperature becomes higher than a first temperature value higher than the target water temperature, and to switch from the on/off normal control, upon repeating the on/off operation of the compressor at a minimum frequency necessary for an operation of the compressor in the on/off normal control, to on/off restriction control that turns on the compressor when the water temperature becomes lower than a second temperature value lower than the target water temperature and turns off the compressor when the water temperature beType: ApplicationFiled: October 17, 2014Publication date: May 21, 2015Inventor: Takahiro USHIJIMA
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Patent number: 8733118Abstract: To provide a heat pump water heater outdoor unit and heat pump water heater capable of preventing reduction in heating/hot water supply ability even at a low ambient temperature.Type: GrantFiled: January 27, 2009Date of Patent: May 27, 2014Assignee: Mitsubishi Electric CorporationInventors: Takahiro Ushijima, Kazuki Okada
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Publication number: 20120279237Abstract: An auxiliary heater control device can be readily attached to a hot water heating system configured with a simple water circuit without a hot water storage tank, and is capable of preventing freezing of circulating water such that use of an auxiliary heater is minimized. When a sensed temperature tS sensed by a temperature sensor is in a range, a control device increases a rotational speed of a circulation pump. When the sensed temperature tS is in a range, the control device increases the rotational speed of the circulation pump and lowers an operating frequency of a compressor. When the sensed temperature tS is in a range, the control device increases the rotational speed of the circulation pump, lowers the operating frequency of the compressor, and activates an auxiliary heater.Type: ApplicationFiled: November 25, 2009Publication date: November 8, 2012Applicant: Mitsubishi Electric CorporationInventors: Takahiro Ushijima, Kazutaka Suzuki, Koji Matsuzawa, Nobuaki Uehara
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Publication number: 20120055178Abstract: It is aimed to provide a heat pump type hot-water supply outdoor apparatus that can control a temperature of a compressor shell, according to a water temperature of a water circuit and a temperature of the compressor.Type: ApplicationFiled: May 18, 2009Publication date: March 8, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Kengo Takahashi, Ryo Oya, Kazuki Okada, Takahiro Ushijima, Hirokazu Minamisako, Shinichi Uchino
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Publication number: 20120018129Abstract: It is aimed to simultaneously supply hot water at a required temperature to a high-temperature heating appliance and hot water at a required temperature to a low-temperature heating appliance, the low-temperature heating appliance requiring hot water at a temperature lower than a temperature required by the high-temperature heating appliance, and to enhance efficiency by collecting surplus heat when the temperature of the hot water to be supplied to the low-temperature heating appliance is adjusted. A pipe through which flows the hot water at a high temperature to be supplied to the high-temperature heating appliance is branched into a first supply pipe and a second supply pipe. Heat exchange is effected between the hot water flowing through the first supply pipe and return water which has been supplied to a first appliance.Type: ApplicationFiled: March 26, 2009Publication date: January 26, 2012Applicant: Mitsubishi Electric CorporationInventors: Takahiro Ushijima, Ryo Oya, Kazuki Okada
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Publication number: 20110315093Abstract: When using a plurality of heaters such as heat pump units, capacity is properly distributed according to the required capacity, thereby enabling highly efficient operation of a hot water system. To achieve this, a control apparatus determines the heating capacity of each of the heat pump units in a way that the total heating capacity of the heat pump units reaches the heating capacity required in the hot water system as a whole, and further in a way that the total COP (coefficient of performance) of the heat pump units satisfies predetermined condition. The control apparatus controls each of regulating valves in a way that the heating capacity of each of the heat pump units reaches the above determined heating capacity.Type: ApplicationFiled: March 30, 2009Publication date: December 29, 2011Applicant: Mitsubishi Electric CorporationInventors: Hirokazu Minamisako, Shinichi Uchino, Kengo Takahashi, Ryo Oya, Kazuki Okada, Takahiro Ushijima
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Patent number: 8020393Abstract: A heat pump type hot water supply outdoor apparatus, in a compressor, a water heat exchanger, a first expansion valve, a medium pressure receiver, a second expansion valve, and an air heat exchanger are connected circularly, has an injection circuit, which is a bypass for a part of the refrigerant between the medium pressure receiver and the second pressure reduction unit, to inject the part of refrigerant into a compression chamber of the compressor, and has a third expansion valve and an internal heat exchanger for carrying out heat exchange between the refrigerant whose pressure is reduced by the third expansion valve and the refrigerant between the medium pressure receiver and the second expansion valve, a pressure detection sensor for detecting a condensing pressure, and a controller for starting an injection control by the third expansion valve at the time when the condensing pressure detected by the pressure sensor or the condensing temperature calculated from the condensing pressure becomes a first prType: GrantFiled: January 27, 2009Date of Patent: September 20, 2011Assignee: Mitsubishi Electric CorporationInventors: Kazuki Okada, Takahiro Ushijima, Kengo Takahashi
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Publication number: 20090241569Abstract: A heat pump type hot water supply outdoor apparatus, in a compressor, a water heat exchanger, a first expansion valve, a medium pressure receiver, a second expansion valve, and an air heat exchanger are connected circularly, has an injection circuit, which is a bypass for a part of the refrigerant between the medium pressure receiver and the second pressure reduction unit, to inject the part of refrigerant into a compression chamber of the compressor, and has a third expansion valve and an internal heat exchanger for carrying out heat exchange between the refrigerant whose pressure is reduced by the third expansion valve and the refrigerant between the medium pressure receiver and the second expansion valve, a pressure detection sensor for detecting a condensing pressure, and a controller for starting an injection control by the third expansion valve at the time when the condensing pressure detected by the pressure sensor or the condensing temperature calculated from the condensing pressure becomes a first prType: ApplicationFiled: January 27, 2009Publication date: October 1, 2009Applicant: Mitsubishi Electric CorporationInventors: Kazuki Okada, Takahiro Ushijima, Kengo Takahashi
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Patent number: 7578896Abstract: A method of producing a multilayer ceramic electronic device, having a firing step for firing a pre-firing element body wherein a plurality of dielectric layers and internal electrode layers containing a base metal are alternately arranged, characterized in that the firing step has a temperature raising step for raising a temperature to a firing temperature, and hydrogen is continued to be introduced from a point in time of the temperature raising step. According to the method, it is possible to provide a method of producing a multilayer ceramic electronic device, such as a multilayer ceramic capacitor, wherein shape anisotropy and other structural defaults are hard to occur and electric characteristics are improved while suppressing deterioration thereof even if dielectric layers becomes thinner and stacked more.Type: GrantFiled: August 29, 2007Date of Patent: August 25, 2009Assignee: TDK CorporationInventors: Takako Hibi, Yukie Nakano, Shunichi Yuri, Takahiro Ushijima, Akira Sato, Wataru Takahara, Masako Yoshii
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Publication number: 20090199581Abstract: To provide a heat pump water heater outdoor unit and heat pump water heater capable of preventing reduction in heating/hot water supply ability even at a low ambient temperature.Type: ApplicationFiled: January 27, 2009Publication date: August 13, 2009Applicant: MIitsubishi Electric CorporationInventors: Takahiro Ushijima, Kazuki Okada
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Publication number: 20080006365Abstract: A method of producing a multilayer ceramic electronic device, having a firing step for firing a pre-firing element body wherein a plurality of dielectric layers and internal electrode layers containing a base metal are alternately arranged, characterized in that the firing step has a temperature raising step for raising a temperature to a firing temperature, and hydrogen is continued to be introduced from a point in time of the temperature raising step. According to the method, it is possible to provide a method of producing a multilayer ceramic electronic device, such as a multilayer ceramic capacitor, wherein shape anisotropy and other structural defaults are hard to occur and electric characteristics are improved while suppressing deterioration thereof even if dielectric layers becomes thinner and stacked more.Type: ApplicationFiled: August 29, 2007Publication date: January 10, 2008Applicant: TDKInventors: Takako Hibi, Yukie Nakano, Shunichi Yuri, Takahiro Ushijima, Akira Sato, Wataru Takahara, Masako Yoshii
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Patent number: 7276130Abstract: A method of producing a multilayer ceramic electronic device, having a firing step for firing a pre-firing element body wherein a plurality of dielectric layers and internal electrode layers containing a base metal are alternately arranged, characterized in that the firing step has a temperature raising step for raising a temperature to a firing temperature, and hydrogen is continued to be introduced from a point in time of the temperature raising step. According to the method, it is possible to provide a method of producing a multilayer ceramic electronic device, such as a multilayer ceramic capacitor, wherein shape anisotropy and other structural defaults are hard to occur and electric characteristics are improved while suppressing deterioration thereof even if dielectric layers becomes thinner and stacked more.Type: GrantFiled: April 12, 2002Date of Patent: October 2, 2007Assignee: TDK CorporationInventors: Takako Hibi, Yukie Nakano, Shunichi Yuri, Takahiro Ushijima, Akira Sato, Wataru Takahara, Masako Yoshii
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Publication number: 20030147194Abstract: A method of producing a multilayer ceramic electronic device, having a firing step for firing a pre-firing element body wherein a plurality of dielectric layers and internal electrode layers containing a base metal are alternately arranged, characterized in that the firing step has a temperature raising step for raising a temperature to a firing temperature, and hydrogen is continued to be introduced from a point in time of the temperature raising step. According to the method, it is possible to provide a method of producing a multilayer ceramic electronic device, such as a multilayer ceramic capacitor, wherein shape anisotropy and other structural defaults are hard to occur and electric characteristics are improved while suppressing deterioration thereof even if dielectric layers becomes thinner and stacked more.Type: ApplicationFiled: December 2, 2002Publication date: August 7, 2003Inventors: Takako Hibi, Yukie Nakano, Shunichi Yuri, Takahiro Ushijima, Akira Sato, Wataru Takahara, Masako Yoshii