Patents by Inventor Ryuuta OHURA
Ryuuta OHURA 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: 20240068695Abstract: An air conditioner includes an indoor unit, an outdoor unit, an outdoor expansion valve, an indoor expansion valve, and a controller. The controller executes first control and second control. The first control includes stopping cooling operation or heating operation if a first condition is satisfied during cooling operation or heating operation, and then starting cooling operation or heating operation if a second condition is satisfied. The first condition indicates that a heat load in a target space is low. The second condition relates to the heat load in the target space. The second control includes setting opening degrees of the outdoor expansion valve and the indoor expansion valve upon a start of cooling operation or heating operation according to the first control to be larger than opening degrees upon satisfaction of the first condition.Type: ApplicationFiled: November 6, 2023Publication date: February 29, 2024Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro NAOI, Yuta FUKUYAMA, Takaya NAKANISHI, Ryuuta OHURA
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Patent number: 11506435Abstract: A water regulator includes a water regulation valve, a first temperature sensor, a second temperature sensor, and a controller. The water regulation valve regulates a quantity of water flowing through water pipes. The first temperature sensor measures a temperature of one of the water pipes which is connected to an inlet of a heat exchanger. The second temperature sensor measures a temperature of one of the water pipes which is connected to an outlet of the heat exchanger. The controller controls an opening degree of the water regulation valve, based on a difference between the temperature measured by the first temperature sensor and the temperature measured by the second temperature sensor.Type: GrantFiled: January 7, 2022Date of Patent: November 22, 2022Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta Ohura, Takuya Kotani
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Publication number: 20220235975Abstract: A support system includes a display and a server. Upon acquiring first information on arrangement of a first refrigerant shut-off unit, second information on each of utilization-side units in a first utilization-side unit group, and third information on one of or both a length and an internal volume of the first connection pipe group, the server determines, based on an allowable leakage amount of the refrigerant into a space where a corresponding one or more utilization-side units is installed, whether the first, second, and third information are suitable for the design, and causes the display to display a result of the determination; or the server calculates a first refrigerant amount as a sum of an amount of the refrigerant in the first refrigerant circuit and an amount of the refrigerant, and causes the display to display the first refrigerant amount.Type: ApplicationFiled: March 4, 2020Publication date: July 28, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta Ohura, Takuya Kotani
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Publication number: 20220146158Abstract: An air conditioning apparatus includes utilization-side units each including a first refrigerant circuit, a heat source-side unit including a second refrigerant circuit, a connection pipe group, and a relay unit. The relay unit is disposed between the first refrigerant circuit and the second refrigerant circuit, and blocks a flammable refrigerant flowing through the connection pipe group. The utilization-side units are disposed in a utilization-side unit group that is a group of two or more utilization-side units. The relay unit blocks a flow of the refrigerant between the first refrigerant circuit and the second refrigerant circuit. The connection pipe group connects the first refrigerant circuit and the refrigerant shut-off unit. The connection pipe group has one or both of a length and an internal volume, which is fixed based on information on capabilities of the two utilization-side units.Type: ApplicationFiled: March 4, 2020Publication date: May 12, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta Ohura, Takuya Kotani
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Publication number: 20220128285Abstract: A water regulator includes a water regulation valve, a first temperature sensor, a second temperature sensor, and a controller. The water regulation valve regulates a quantity of water flowing through water pipes. The first temperature sensor measures a temperature of one of the water pipes which is connected to an inlet of a heat exchanger. The second temperature sensor measures a temperature of one of the water pipes which is connected to an outlet of the heat exchanger. The controller controls an opening degree of the water regulation valve, based on a difference between the temperature measured by the first temperature sensor and the temperature measured by the second temperature sensor.Type: ApplicationFiled: January 7, 2022Publication date: April 28, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta OHURA, Takuya KOTANI
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Patent number: 10684050Abstract: Provided is a refrigeration apparatus in which adverse events caused by excess refrigerant can be suppressed even when defrosting is performed with some of a plurality of outdoor units designated as units to be defrosted. An air-conditioning apparatus is configured from a parallel connection of a first outdoor unit and a second outdoor unit, wherein when a second outdoor heat exchanger of the second outdoor unit is caused to function as an evaporator while a first outdoor heat exchanger of the first outdoor unit is caused to function as a condenser to defrost the first outdoor heat exchanger, a refrigerant circuit has a flow channel that supplies some of the refrigerant flowing out of the first outdoor heat exchanger to the second outdoor heat exchanger and a flow channel that supplies the rest of the refrigerant flowing out of the first outdoor heat exchanger to an indoor heat exchanger.Type: GrantFiled: January 11, 2017Date of Patent: June 16, 2020Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta Ohura, Takuya Kotani, Junya Minami
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Patent number: 10527323Abstract: In a case where the total volume of plural indoor heat exchangers is smaller than the volume of an outdoor heat exchanger, a control component performs a heating refrigerant charging operation until a heating refrigerant charging completion condition is met, and thereafter performs a cooling refrigerant charging operation until a refrigerant charging completion condition where a refrigerant circuit is charged with a prescribed quantity of refrigerant is met.Type: GrantFiled: November 21, 2016Date of Patent: January 7, 2020Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta Ohura, Junya Minami
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Patent number: 10508846Abstract: When charging a refrigerant circuit with refrigerant, a control component starts a heating refrigerant charging operation that is performed by switching the refrigerant circuit to a heating cycle state and performs the heating refrigerant charging operation until a predetermined heating refrigerant charging completion condition is met. Thereafter, the control component switches to a cooling refrigerant charging operation that is performed by switching the refrigerant circuit to a cooling cycle state and performs the cooling refrigerant charging operation until a refrigerant charging completion condition where the refrigerant circuit is charged with a prescribed quantity of the refrigerant is met.Type: GrantFiled: December 20, 2016Date of Patent: December 17, 2019Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta Ohura, Junya Minami
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Patent number: 10502446Abstract: In an air conditioning device (10) to which an outdoor unit (20) and indoor units (40) are connected, when a flow rate of a gaseous refrigerant in a gas main pipe (72a) is lower than a lower limit flow rate in main pipe, an amount of refrigerating machine oil accumulated in the gas main pipe (72a) is calculated. When gas branch pipes (72b) include a gas branch pipe (72b) having a flow rate lower than a lower limit flow rate in branch pipe even though the flow rate of the gaseous refrigerant in the gas main pipe (72a) is higher than the lower limit flow rate in main pipe, an amount of the machine oil accumulated in the gas branch pipe (72b) is calculated. When the amounts are integrated and the integrated value exceeds a set amount, oil collecting operation is performed.Type: GrantFiled: December 17, 2015Date of Patent: December 10, 2019Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta Ohura, Yuusuke Oka, Junya Minami
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Patent number: 10473374Abstract: Provided is a refrigeration apparatus in which a decrease in a temperature of an indoor heat exchanger can be suppressed as much as possible while depletion of refrigerator oil in a compressor is also suppressed. An air-conditioning apparatus configured from a parallel connection of a plurality of outdoor units to an indoor unit, wherein when a predetermined defrosting condition has been fulfilled, a controller includes at least one processor programmed to selectively execute a reverse-cycle defrost mode when a predetermined outflow condition pertaining to an outflow integrated quantity of refrigerator oil has also been fulfilled, and selectively execute an alternating defrost mode, in which the outdoor unit that is to be defrosted is changed in sequence, when the predetermined outflow condition has not been fulfilled.Type: GrantFiled: July 13, 2018Date of Patent: November 12, 2019Assignee: Daikin Industries, Ltd.Inventors: Ryuuta Ohura, Junya Minami
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Publication number: 20190032978Abstract: Provided is a refrigeration apparatus in which adverse events caused by excess refrigerant can be suppressed even when defrosting is performed with some of a plurality of outdoor units designated as units to be defrosted. An air-conditioning apparatus is configured from a parallel connection of a first outdoor unit and a second outdoor unit, wherein when a second outdoor heat exchanger of the second outdoor unit is caused to function as an evaporator while a first outdoor heat exchanger of the first outdoor unit is caused to function as a condenser to defrost the first outdoor heat exchanger, a refrigerant circuit has a flow channel that supplies some of the refrigerant flowing out of the first outdoor heat exchanger to the second outdoor heat exchanger and a flow channel that supplies the rest of the refrigerant flowing out of the first outdoor heat exchanger to an indoor heat exchanger.Type: ApplicationFiled: January 11, 2017Publication date: January 31, 2019Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta OHURA, Takuya KOTANI, Junya MINAMI
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Patent number: 10184683Abstract: A multi-type air conditioning device controls an evaporation temperature and a condensing temperature, depending on required capacity of an indoor unit. The air conditioning device compares a current evaporation temperature or condensing temperature with a reference value, of an evaporation temperature or an condensing temperature, corresponding to a lower limit flow rate, of a gaseous refrigerant, required for refrigerating machine oil not to accumulate in, but to flow through, the gas branch pipes, and calculates an amount of the refrigerating machine oil accumulated in a gas branch pipe which does not satisfy the lower limit flow rate. When the calculated amount exceeds a set amount, the air conditioning device performs oil collecting operation, and controls the oil collecting operation in view of a flow rate of a gaseous refrigerant in gas branch pipes.Type: GrantFiled: December 17, 2015Date of Patent: January 22, 2019Assignee: Daikin Industries, Ltd.Inventors: Ryuuta Ohura, Yuusuke Oka, Junya Minami
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Publication number: 20190011157Abstract: When charging a refrigerant circuit with refrigerant, a control component starts a heating refrigerant charging operation that is performed by switching the refrigerant circuit to a heating cycle state and performs the heating refrigerant charging operation until a predetermined heating refrigerant charging completion condition is met. Thereafter, the control component switches to a cooling refrigerant charging operation that is performed by switching the refrigerant circuit to a cooling cycle state and performs the cooling refrigerant charging operation until a refrigerant charging completion condition where the refrigerant circuit is charged with a prescribed quantity of the refrigerant is met.Type: ApplicationFiled: December 20, 2016Publication date: January 10, 2019Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta OHURA, Junya MINAMI
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Publication number: 20180372380Abstract: In a case where the total volume of plural indoor heat exchangers is smaller than the volume of an outdoor heat exchanger, a control component performs a heating refrigerant charging operation until a heating refrigerant charging completion condition is met, and thereafter performs a cooling refrigerant charging operation until a refrigerant charging completion condition where a refrigerant circuit is charged with a prescribed quantity of refrigerant is met.Type: ApplicationFiled: November 21, 2016Publication date: December 27, 2018Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta OHURA, Junya MINAMI
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Publication number: 20180328636Abstract: Provided is a refrigeration apparatus in which a decrease in a temperature of an indoor heat exchanger can be suppressed as much as possible while depletion of refrigerator oil in a compressor is also suppressed. An air-conditioning apparatus configured from a parallel connection of a plurality of outdoor units to an indoor unit, wherein when a predetermined defrosting condition has been fulfilled, a controller includes at least one processor programmed to selectively execute a reverse-cycle defrost mode when a predetermined outflow condition pertaining to an outflow integrated quantity of refrigerator oil has also been fulfilled, and selectively execute an alternating defrost mode, in which the outdoor unit that is to be defrosted is changed in sequence, when the predetermined outflow condition has not been fulfilled.Type: ApplicationFiled: July 13, 2018Publication date: November 15, 2018Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta OHURA, Junya MINAMI
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Patent number: 9939180Abstract: In a refrigeration apparatus, in a first operation mode, a comparison is made between a first liquid pipe temperature, which is a temperature of a refrigerant on a side of a liquid pipe heat exchanger that is near usage-side heat exchangers, and a second liquid pipe temperature, which is a temperature of the refrigerant on a side of the liquid pipe heat exchanger that is near a plurality of heat-source-side heat exchangers, the liquid pipe heat exchanger performing heat exchange with the refrigerant flowing through liquid sides of the heat-source-side heat exchangers. When an evaporation-switch liquid pipe temperature condition is satisfied, the heat-source-side heat exchanger functioning as a radiator of the refrigerant is switched to an evaporator of the refrigerant, and the first operation mode is switched to a second operation mode in which the plurality of heat-source-side heat exchangers are caused to function as evaporators of the refrigerant.Type: GrantFiled: May 20, 2015Date of Patent: April 10, 2018Assignee: Daikin Industries, Ltd.Inventors: Mari Susaki, Masahiro Oka, Ryuuta Ohura
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Publication number: 20180023870Abstract: In an air conditioning device (10) to which an outdoor unit (20) and indoor units (40) are connected, when a flow rate of a gaseous refrigerant in a gas main pipe (72a) is lower than a lower limit flow rate in main pipe, an amount of refrigerating machine oil accumulated in the gas main pipe (72a) is calculated. When gas branch pipes (72b) include a gas branch pipe (72b) having a flow rate lower than a lower limit flow rate in branch pipe even though the flow rate of the gaseous refrigerant in the gas main pipe (72a) is higher than the lower limit flow rate in main pipe, an amount of the machine oil accumulated in the gas branch pipe (72b) is calculated. When the amounts are integrated and the integrated value exceeds a set amount, oil collecting operation is performed.Type: ApplicationFiled: December 17, 2015Publication date: January 25, 2018Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta OHURA, Yuusuke OKA, Junya MINAMI
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Publication number: 20180003419Abstract: A multi-type air conditioning device controls an evaporation temperature and a condensing temperature, depending on required capacity of an indoor unit. The air conditioning device compares a current evaporation temperature or condensing temperature with a reference value, of an evaporation temperature or an condensing temperature, corresponding to a lower limit flow rate, of a gaseous refrigerant, required for refrigerating machine oil not to accumulate in, but to flow through, the gas branch pipes, and calculates an amount of the refrigerating machine oil accumulated in a gas branch pipe which does not satisfy the lower limit flow rate. When the calculated amount exceeds a set amount, the air conditioning device performs oil collecting operation, and controls the oil collecting operation in view of a flow rate of a gaseous refrigerant in gas branch pipes.Type: ApplicationFiled: December 17, 2015Publication date: January 4, 2018Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryuuta OHURA, Yuusuke OKA, Junya MINAMI
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Publication number: 20170198944Abstract: In a refrigeration apparatus, in a first operation mode, a comparison is made between a first liquid pipe temperature, which is a temperature of a refrigerant on a side of a liquid pipe heat exchanger that is near usage-side heat exchangers, and a second liquid pipe temperature, which is a temperature of the refrigerant on a side of the liquid pipe heat exchanger that is near a plurality of heat-source-side heat exchangers, the liquid pipe heat exchanger performing heat exchange with the refrigerant flowing through liquid sides of the heat-source-side heat exchangers. When an evaporation-switch liquid pipe temperature condition is satisfied, the heat-source-side heat exchanger functioning as a radiator of the refrigerant is switched to an evaporator of the refrigerant, and the first operation mode is switched to a second operation mode in which the plurality of heat-source-side heat exchangers are caused to function as evaporators of the refrigerant.Type: ApplicationFiled: May 20, 2015Publication date: July 13, 2017Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Mari SUSAKI, Masahiro OKA, Ryuuta OHURA