Patents by Inventor Satoru Toyama
Satoru Toyama 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: 20240110119Abstract: A refrigeration cycle device comprises a refrigerant, a compressor that compresses the refrigerant, and a refrigerating machine oil that lubricates a sliding part of the compressor. The refrigerant includes trifluoroiodomethane. The refrigerating machine oil includes a base oil and a quinone additive. The quinone additive is at least one selected from the group consisting of 1,4-benzoquinone, 1,2-benzoquinone, 2-methyl-1,4-benzoquinone, 2-phenyl-1,4-benzoquinone, 2-tert-butyl-1,4-benzoquinone, 1,4-naphthoquinone, 1,2-naphthoquinone, 2,6-naphthoquinone, 2-hydroxy-1,4-naphthoquinone, and 1,4-anthraquinone.Type: ApplicationFiled: February 9, 2021Publication date: April 4, 2024Applicant: Mitsubishi Electric CorporationInventors: Kengo HIRATSUKA, Manami NAKAMURA, Kenji KOJIMA, Satoru TOYAMA
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Publication number: 20230242833Abstract: A refrigeration cycle apparatus including a refrigeration circuit, the refrigeration circuit including a compressor, an outdoor heat exchanger, an indoor heat exchanger, and an expansion valve, wherein a refrigerant is sealed within the refrigeration circuit, the refrigerant contains trifluoroiodomethane, the compressor is filled with a refrigerator oil, and the refrigerator oil contains at least one of a first compound represented by the following chemical formula 1 and a second compound represented by the following chemical formula 2:Type: ApplicationFiled: July 21, 2020Publication date: August 3, 2023Applicant: Mitsubishi Electric CorporationInventors: Kenji KOJIMA, Kengo HIRATSUKA, Satoru TOYAMA, Manami NAKAMURA
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Publication number: 20220349633Abstract: A refrigeration cycle apparatus includes a refrigerant circuit and allows refrigerant containing a halogenated hydrocarbon to circulate in the refrigerant circuit. The halogenated hydrocarbon has at least one of C—I bond, C—Br bond, and C—CI bond and has no double bond, at least one of members constituting the refrigerant circuit is a copper-containing member, and at least a part of a surface of the copper-containing member does not contact the refrigerant.Type: ApplicationFiled: October 2, 2019Publication date: November 3, 2022Applicant: Mitsubishi Electric CorporationInventors: Kengo HIRATSUKA, Satoru TOYAMA, Kenji KOJIMA, Shuhei KOYAMA
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Patent number: 11015987Abstract: A temperature estimation method estimating a temperature of a heat generating site in an oil-immersed electric appliance immersed in insulating oil, the insulating oil being silicone oil or ester oil. The temperature estimation method includes measuring concentrations of two types of thermal decomposition products in the insulating oil and calculating a temperature of the heat generating site in the oil-immersed electric appliance based on a concentration ratio between the two types of thermal decomposition products and a relational expression between the temperature of the heat generating site and the concentration ratio prepared in advance. When the silicone oil is adopted as the insulating oil, at least one of the two types of thermal decomposition products is straight-chain siloxane, alcohol containing silicon, or benzene. When the ester oil is adopted as the insulating oil, the two types of thermal decomposition products are fatty acids.Type: GrantFiled: June 6, 2017Date of Patent: May 25, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kota Mizuno, Satoru Toyama, Ryuichi Nishiura, Tsuyoshi Amimoto, Ryota Kuriyama
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Publication number: 20210033570Abstract: The present invention provides a method of diagnosing an oil-immersed electrical apparatus by an assessment of a state of deterioration of the oil-immersed electrical apparatus including an insulating oil. The insulating oil has been subjected to changing from mineral oil to vegetable oil.Type: ApplicationFiled: April 25, 2018Publication date: February 4, 2021Applicant: Mitsubishi Electric CorporationInventors: Fukutaro Kato, Satoru Toyama
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Publication number: 20200326364Abstract: The present invention is related to a method of diagnosing an oil-immersed electrical apparatus by an assessment of a state of deterioration of the oil-immersed electrical apparatus, in which the oil-immersed electrical apparatus includes an insulating oil and an insulating paper and the insulating paper contains an amine compound. This method includes performing a quantitative analysis of a marker substance contained in the insulating oil and assessing a state of deterioration of the oil-immersed electrical apparatus based on a quantified value of the marker substance obtained by the quantitative analysis. The marker substance is a degradation product of cellulose, and this degradation product of cellulose does not chemically react with a deterioration product of the amine compound.Type: ApplicationFiled: December 9, 2019Publication date: October 15, 2020Applicant: Mitsubishi Electric CorporationInventors: Fukutaro OKAZAKI, Satoru TOYAMA
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Patent number: 10359411Abstract: The present invention is a diagnosis method for internal fault of an oil-immersed electric apparatus using a silicone oil as an insulating oil. The method diagnoses an internal fault of the oil-immersed electric apparatus based on a first concentration ratio that is a concentration ratio between two gases selected from an analysis gas group consisting of hydrogen gas, methane gas, ethane gas, and ethylene gas contained in the, silicone oil, and a second concentration ratio that is a concentration ratio between the other two gases selected from the analysis gas group. A combination of the two gases and a combination of the other two gases are a combination of ethylene gas and hydrogen gas, a combination of ethane gas and hydrogen gas, a combination of ethylene gas and methane gas, or a combination of methane gas and ethane gas.Type: GrantFiled: July 17, 2015Date of Patent: July 23, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryota Kuriyama, Fukutaro Kato, Shiki Hayamizu, Satoru Toyama, Kota Mizuno
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Patent number: 10302618Abstract: The method for diagnosing the oil-filled electrical apparatus in the present invention is a method for diagnosing whether or not discharge has occurred inside the oil-filled electrical apparatus. The diagnosing method includes: an in-oil gases analyzing step of analyzing hydrogen gas and a gas selected from the group consisting of methane, ethane, ethylene, acetylene, hydrocarbon having a carbon number of 3 or 4, carbon monoxide, carbon dioxide, oxygen, and nitrogen, contained in an insulating oil used inside the oil-filled electrical apparatus; a step of analyzing a causative substance serving as a cause of generation of hydrogen in the insulating oil irrespective of whether or not the discharge has occurred; and a step of diagnosing whether or not the discharge has occurred based on an analysis result of the in-oil gases analyzing step and an analysis result of the step of analyzing the causative substance.Type: GrantFiled: August 27, 2014Date of Patent: May 28, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryota Kuriyama, Fukutaro Kato, Ryuichi Nishiura, Satoru Toyama, Kota Mizuno
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Publication number: 20190128749Abstract: A temperature estimation method estimating a temperature of a heat generating site in an oil-immersed electric appliance immersed in insulating oil, the insulating oil being silicone oil or ester oil. The temperature estimation method includes measuring concentrations of two types of thermal decomposition products in the insulating oil and calculating a temperature of the heat generating site in the oil-immersed electric appliance based on a concentration ratio between the two types of thermal decomposition products and a relational expression between the temperature of the heat generating site and the concentration ratio prepared in advance. When the silicone oil is adopted as the insulating oil, at least one of the two types of thermal decomposition products is straight-chain siloxane, alcohol containing silicon, or benzene. When the ester oil is adopted as the insulating oil, the two types of thermal decomposition products are fatty acids.Type: ApplicationFiled: June 6, 2017Publication date: May 2, 2019Applicant: Mitsubishi Electric CorporationInventors: Kota MIZUNO, Satoru TOYAMA, Ryuichi NISHIURA, Tsuyoshi AMIMOTO, Ryota KURIYAMA
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Publication number: 20180335467Abstract: A testing method of the present invention is a testing method for examining a degree of deterioration, due to oxygen, of an object material constituting an oil-filled electrical apparatus. The oil-filled electrical apparatus is an open-type oil-filled electrical apparatus including an insulating oil, an insulator, and a conductor, the insulating oil being contained as being in contact with the atmosphere. The object material is at least any of the insulating oil, the insulator, and the conductor. The testing method includes putting the insulating oil and the object material into a testing tank, keeping a state where dry air is continuously supplied to the upper space in the testing tank, and subsequently performing measurement of an index of deterioration of the object material due to oxygen.Type: ApplicationFiled: October 11, 2017Publication date: November 22, 2018Applicant: Mitsubishi Electric CorporationInventors: Fukutaro KATO, Tsuyoshi AMIMOTO, Ryota KURIYAMA, Ryuichi NISHIURA, Satoru TOYAMA, Kota MIZUNO
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Publication number: 20180143176Abstract: The present invention is a diagnosis method for internal fault of an oil-immersed electric apparatus using a silicone oil as an insulating oil. The method diagnoses an internal fault of the oil-immersed electric apparatus based on a first concentration ratio that is a concentration ratio between two gases selected from an analysis gas group consisting of hydrogen gas, methane gas, ethane gas, and ethylene gas contained in the, silicone oil, and a second concentration ratio that is a concentration ratio between the other two gases selected from the analysis gas group. A combination of the two gases and a combination of the other two gases are a combination of ethylene gas and hydrogen gas, a combination of ethane gas and hydrogen gas, a combination of ethylene gas and methane gas, or a combination of methane gas and ethane gas.Type: ApplicationFiled: July 17, 2015Publication date: May 24, 2018Applicant: Mitsubishi Electric CorporationInventors: Ryota KURIYAMA, Fukutaro KATO, Shiki HAYAMIZU, Kota MIZUNO, Satoru TOYAMA
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Patent number: 9915465Abstract: An insulating material that tends not to hydrolyze is used to thereby provide a heat pump apparatus having long-term reliability. An electric motor of a compressor is fixed to a sealed container and includes a stator around which a winding wire is wound through intermediation of an insulating material, and a rotor surrounded by the stator. The insulating material is a wholly aromatic liquid crystal polyester (LCP) having a molecular main chain constituted by a monomer including p-hydroxybenzoic acid (PHB) as an essential monomer and a monomer solely including benzene-ring as another monomer via an ester bond. The refrigerating machine oil has a saturated water content of 2% or less at 40 degrees C., a relative humidity of 80%, for 24 Hr. To suppress the explosive decomposition reaction of ethylene-based fluorohydrocarbon, a flame retardant is used to generate chemical species that complement active radicals that cause the decomposition reaction.Type: GrantFiled: March 6, 2015Date of Patent: March 13, 2018Assignee: Mitsubishi Electric CorporationInventors: Noriaki Matsunaga, Shinobu Ogasawara, Takeharu Kageyama, Satoru Toyama, Kota Mizuno, Yutaka Hirakawa
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Publication number: 20170199170Abstract: The method for diagnosing the oil-filled electrical apparatus in the present invention is a method for diagnosing whether or not discharge has occurred inside the oil-filled electrical apparatus. The diagnosing method includes: an in-oil gases analyzing step of analyzing hydrogen gas and a gas selected from the group consisting of methane, ethane, ethylene, acetylene, hydrocarbon having a carbon number of 3 or 4, carbon monoxide, carbon dioxide, oxygen, and nitrogen, contained in an insulating oil used inside the oil-filled electrical apparatus; a step of analyzing a causative substance serving as a cause of generation of hydrogen in the insulating oil irrespective of whether or not the discharge has occurred; and a step of diagnosing whether or not the discharge has occurred based on an analysis result of the in-oil gases analyzing step and an analysis result of the step of analyzing the causative substance.Type: ApplicationFiled: August 27, 2014Publication date: July 13, 2017Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryota KURIYAMA, Fukutaro KATO, Ryuichi NISHIURA, Satoru TOYAMA, Kota MIZUNO
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Publication number: 20170146284Abstract: An insulating material that tends not to hydrolyze is used to thereby provide a heat pump apparatus having long-term reliability. An electric motor of a compressor is fixed to a sealed container and includes a stator around which a winding wire is wound through intermediation of an insulating material, and a rotor surrounded by the stator. The insulating material is a wholly aromatic liquid crystal polyester (LCP) having a molecular main chain constituted by a monomer including p-hydroxybenzoic acid (PHB) as an essential monomer and a monomer solely including benzene-ring as another monomer via an ester bond. The refrigerating machine oil has a saturated water content of 2% or less at 40 degrees C., a relative humidity of 80%, for 24 Hr. To suppress the explosive decomposition reaction of ethylene-based fluorohydrocarbon, a flame retardant is used to generate chemical species that complement active radicals that cause the decomposition reaction.Type: ApplicationFiled: March 6, 2015Publication date: May 25, 2017Inventors: Noriaki MATSUNAGA, Shinobu OGASAWARA, Takeharu KAGEYAMA, Satoru TOYAMA, Kota MIZUNO, Yutaka HIRAKAWA
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Patent number: 9396835Abstract: The present invention is a method for preventing copper sulfide generation in oil-filled electrical equipment having an inhibitor of copper sulfide generation in insulating oil, and the method is characterized in monitoring characteristics of the insulating oil and performing re-addition of the inhibitor at an appropriate moment in accordance with a result of the monitoring.Type: GrantFiled: November 30, 2011Date of Patent: July 19, 2016Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Fukutaro Kato, Eiichi Nagao, Tsuyoshi Amimoto, Satoru Toyama, Kota Mizuno
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Patent number: 9228992Abstract: The present invention relates to an electric insulating oil inspection method for determining whether or not an inhibitor-consuming substance is present in an electric insulating oil. The inhibitor-consuming substance is such a substance that causes to decrease over time a concentration of an inhibitor which is added to the electric insulating oil to inhibit copper sulfide from being generated on an insulating paper immersed in the electric insulating oil. The electric insulting oil inspection method includes steps of: preserving the electric insulating oil at a predetermined condition, measuring a concentration of the inhibitor, and determining that the inhibitor-consuming substance is present upon condition that a decrement of the concentration of the inhibitor relative to an initial concentration of the inhibitor becomes not less than a specified amount within a predetermined period.Type: GrantFiled: December 13, 2010Date of Patent: January 5, 2016Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Fukutaro Kato, Eiichi Nagao, Tsuyoshi Amimoto, Satoru Toyama, Kota Mizuno
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Publication number: 20150192559Abstract: A diagnosis method for oil-filled electrical equipment, for diagnosing a risk of occurrence of an abnormality caused by generation of copper sulfide on insulating paper, wherein a step 1 of conducting sulfidation corrosion evaluation of insulating oil in the oil-filled electrical equipment is performed, any one of a step 2A-1 of analyzing the insulating oil for presence of dibenzyldisulfide and an oxidative degradation preventing agent, a step 2A-2 of analyzing the insulating oil for presence of a copper sulfide generation inhibitor, and a step 2B of checking presence of oxygen in an atmosphere of the insulating oil is performed, a step 3 of analyzing the insulating oil for presence of a byproduct derived when copper sulfide is generated from dibenzyldisulfide is performed, and a step 4 of diagnosing the risk of occurrence of an abnormality based on results of the steps 1, 2A-1, 2A-2, and 3 is performed.Type: ApplicationFiled: November 20, 2012Publication date: July 9, 2015Applicant: Mitsubishi Electric CorporationInventors: Fukutaro Kato, Tsuyoshi Amimoto, Ryuichi Nishiura, Satoru Toyama, Kota Mizuno
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Patent number: 8912274Abstract: To obtain water-dispersible varnish used in an alternative refrigerant/refrigerating machine oil refrigerant system or a natural refrigerant/refrigerating machine oil refrigerant system, the water-dispersible varnish being capable of solving two problems, namely, reducing the volatile components and the like during thermal curing and resistance of the cured varnish to the refrigerant system, wherein the water-dispersible varnish has a specific thermosetting resin as base polymer, a specific vinyl monomer as reactive diluent, organic peroxide as reaction initiator, and water mixed therein.Type: GrantFiled: August 3, 2009Date of Patent: December 16, 2014Assignees: Mitsubishi Electric Corporation, Ryoden Kasei Co., Ltd.Inventors: Shigeyuki Yamamoto, Yoshinori Shirafuji, Toshifumi Kanri, Satoru Toyama, Nobuyuki Kamegawa, Yukio Hidaka
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Patent number: 8854068Abstract: An object of the invention is to provide a diagnostic method for an oil-filled electrical device that considers a temperature distribution in the oil-filled electrical device and enables accurate diagnosis to be conducted even when the method is applied to diagnosis of an actually operating device, and further provide a method with which such diagnosis of an oil-filled electrical device can be conducted from a component analysis value of an insulating oil in the oil-filled electrical device. The invention is a diagnostic method for an oil-filled electrical device including in an insulating oil a metal part wrapped with insulating paper, and determines that a time when a surface resistivity of a maximum precipitation site where metal sulfide is most precipitated on the insulating paper reaches a preset surface resistivity management value is a time of occurrence of an abnormality.Type: GrantFiled: August 18, 2008Date of Patent: October 7, 2014Assignee: Mitsubishi Electric CorporationInventors: Eiichi Nagao, Kentaro Taninouchi, Noboru Hosokawa, Tsuyoshi Amimoto, Kozo Tachibana, Hirotaka Muto, Junji Tanimura, Satoru Toyama
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Publication number: 20140231726Abstract: The present invention is a method for preventing copper sulfide generation in oil-filled electrical equipment having an inhibitor of copper sulfide generation in insulating oil, and the method is characterized in monitoring characteristics of said insulating oil and performing re-addition of said inhibitor at an appropriate moment in accordance with a result of said monitoring.Type: ApplicationFiled: November 30, 2011Publication date: August 21, 2014Applicant: Mitsubishi Electric CorporationInventors: Fukutaro Kato, Eiichi Nagao, Tsuyoshi Amimoto, Satoru Toyama, Kota Mizuno