Patents by Inventor Hirokazu Otani
Hirokazu Otani 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: 11387631Abstract: A heat pipe includes an insulating hollow body located inside an outer conductor. The insulating hollow body insulates a portion of the heat pipe on an outer conductor side and a portion of the heat pipe on an inner conductor side from each other. The heat pipe has a plurality of sections each connecting a corresponding one of a plurality of connection conductors to the insulating hollow body. The heat pipe further includes a communication path connecting portions of the heat pipe to each other to cause the plurality of sections to be in communication with each other. Each of the portions is connected to a corresponding one of the plurality of connection conductors.Type: GrantFiled: October 24, 2017Date of Patent: July 12, 2022Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Naoki Iwamoto, Hirokazu Otani, Motohiro Sato
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Publication number: 20200263934Abstract: A heat pipe includes an insulating hollow body located inside an outer conductor. The insulating hollow body insulates a portion of the heat pipe on an outer conductor side and a portion of the heat pipe on an inner conductor side from each other. The heat pipe has a plurality of sections each connecting a corresponding one of a plurality of connection conductors to the insulating hollow body. The heat pipe further includes a communication path connecting portions of the heat pipe to each other to cause the plurality of sections to be in communication with each other. Each of the portions is connected to a corresponding one of the plurality of connection conductors.Type: ApplicationFiled: October 24, 2017Publication date: August 20, 2020Applicant: Mitsubishi Electric CorporationInventors: Naoki IWAMOTO, Hirokazu OTANI, Motohiro SATO
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Patent number: 10535984Abstract: A power device, which includes: an energizing conductor; a power generation unit configured to generate power that is induced by a magnetic flux of a current flowing through the energizing conductor; a power device unit configured to use the power generated in the power generation unit as a power source; a short-circuit switch capable of short-circuiting an output from the power generation unit; and a sealed container in which the energizing conductor, the power generation unit and the power device unit are included, and an insulating fluid is enclosed in the sealed container. This power device is provided as a highly reliable power device, which is used in an AC power system and does not induce an excessive voltage in the power generation unit when the power device unit is stopped in the state where the energized state of the energizing conductor is maintained.Type: GrantFiled: November 29, 2016Date of Patent: January 14, 2020Assignee: Mitsubishi Electric CorporationInventors: Motohiro Sato, Katsuhiko Horinouchi, Hirokazu Otani
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Publication number: 20180358790Abstract: A power device is provided, which includes: an energizing conductor; a power generation unit configured to generate power that is induced by a magnetic flux of a current flowing through the energizing conductor; a power device unit configured to use the power generated in the power generation unit as a power source; a short-circuit switch capable of short-circuiting an output from the power generation unit; and a sealed container in which the energizing conductor, the power generation unit and the power device unit are included, and an insulating fluid is enclosed in the sealed container. This power device is provided as a highly reliable power device, which is used in an AC power system and does not induce an excessive voltage in the power generation unit when the power device unit is stopped in the state where the energized state of the energizing conductor is maintained.Type: ApplicationFiled: November 29, 2016Publication date: December 13, 2018Applicant: Mitsubishi Electric CorporationInventors: Motohiro SATO, Katsuhiko HORINOUCHI, Hirokazu OTANI
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Patent number: 9941035Abstract: An insulating support includes a pillar-shaped portion made of resin, a metal insert buried in one end surface of the pillar-shaped portion in an axial direction, a metal insert buried in the other end surface of the pillar-shaped portion in the axial direction, and one protrusion made of the resin and provided in a ring shape and integrally with the pillar-shaped portion on an outer circumferential surface of the pillar-shaped portion on a side of the metal insert. The metal insert includes a first cylindrical base portion and a first distal end portion. The metal insert includes a second cylindrical base portion and a second distal end portion. A whole of the first distal end portion is disposed within an extended range of the protrusion in the axial direction.Type: GrantFiled: April 4, 2014Date of Patent: April 10, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Hirokazu Otani, Koichi Kaneda, Yuji Yoshitomo, Daisuke Yoshida
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Patent number: 9929545Abstract: The present invention relates to an insulating support for a power switchgear that insulates and supports the main body of a power switchgear provided in atmospheric air between a generator and a main transformer. The insulating support includes a core part that is molded only from a resin material and has a cylindrical shape; an exterior covering part that is molded only from a rubber material, is attached to an outer peripheral face of the core part, and includes a plurality of pleated parts; an end metal fitting that is attached to one end of the core part and is attached to the main body of the power switchgear; and an end metal fitting that is attached to the other end of the core part and is provided on the ground surface.Type: GrantFiled: September 6, 2013Date of Patent: March 27, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yuji Yoshitomo, Hirokazu Otani, Daisuke Yoshida
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Publication number: 20170117072Abstract: An insulating support includes a pillar-shaped portion made of resin, a metal insert buried in one end surface of the pillar-shaped portion in an axial direction, a metal insert buried in the other end surface of the pillar-shaped portion in the axial direction, and one protrusion made of the resin and provided in a ring shape and integrally with the pillar-shaped portion on an outer circumferential surface of the pillar-shaped portion on a side of the metal insert. The metal insert includes a first cylindrical base portion and a first distal end portion. The metal insert includes a second cylindrical base portion and a second distal end portion. A whole of the first distal end portion is disposed within an extended range of the protrusion in the axial direction.Type: ApplicationFiled: April 4, 2014Publication date: April 27, 2017Applicant: Mitsubishi Electric CorporationInventors: Hirokazu OTANI, Koichi KANEDA, Yuji YOSHITOMO, Daisuke YOSHIDA
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Patent number: 9552942Abstract: A gas circuit breaker includes contact rings formed of an elastically deformable material, a movable contact that moves reciprocally along an axis line direction between a current supply position where the movable contact bridges the contact rings and a current cutoff position where the movable contact is separated from both the contact rings, holding tools formed in an annular shape and respectively attached to the contact rings, a covering member having electrically insulating property, slidably attached to a distal end portion of the holding tool in the axis line direction, and configured to be brought into contact with the contact ring, and a covering member having electrically insulating property, slidably attached to a distal end portion of the holding tool in the axis line direction, and configured to be brought into contact with the contact ring.Type: GrantFiled: March 16, 2012Date of Patent: January 24, 2017Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Toru Yamashita, Daisuke Yoshida, Hirokazu Otani
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Publication number: 20160197458Abstract: The present invention relates to an insulating support for a power switchgear that insulates and supports the main body of a power switchgear provided in atmospheric air between a generator and a main transformer. The insulating support includes a core part that is molded only from a resin material and has a cylindrical shape; an exterior covering part that is molded only from a rubber material, is attached to an outer peripheral face of the core part, and includes a plurality of pleated parts; an end metal fitting that is attached to one end of the core part and is attached to the main body of the power switchgear; and an end metal fitting that is attached to the other end of the core part and is provided on the ground surface.Type: ApplicationFiled: September 6, 2013Publication date: July 7, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yuji YOSHITOMO, Hirokazu OTANI, Daisuke YOSHIDA
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Patent number: 9384924Abstract: Provided are: a hermetically-enclosed tank that is filled with insulating gas; a blocking unit that is provided within the hermetically-enclosed tank and is configured with a movable arc contact and a fixed arc contact opposing each other; a plurality of energizing units, within the hermetically-enclosed tank, that are provided around the blocking unit about its axial line as a center and located away from each other; and a fixed-side auxiliary conductor that is provided between a gas space which stores the energizing units and a gas space on the side of the fixed arc contact. A communication hole is formed on the fixed-side auxiliary conductor so as to communicate the gas space provided between the energizing units with the gas space.Type: GrantFiled: May 22, 2012Date of Patent: July 5, 2016Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Toru Yamashita, Daisuke Yoshida, Hirokazu Otani
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Patent number: 9242875Abstract: In accordance with the present invention, there is provided a calcium removal method capable of reducing operation cost. A solution L2 containing potassium or/and sodium, and calcium is passed through an ion-exchange resin 35 to separate the solution into a solution containing potassium or/and the sodium, and a solution containing calcium. Operation cost can remarkably be decreased since potassium carbonate is not required to remove calcium as before. Timing for changing a calcium-containing water L3 and a salt water L4 discharged from the ion-exchange resin can be performed based on at least one measurement result selected from the group consisting of: a calcium or chlorine concentration; electrical conductivity; and pH of a fluid which is discharged from said ion-exchange resin. The solution may be a filtrate L1 that is obtained by washing a chlorine bypass dust D generated in a cement burning process, or a leachate W of a final disposal site 50.Type: GrantFiled: May 11, 2011Date of Patent: January 26, 2016Assignee: Taiheiyo Cement CorporationInventors: Noritoshi Tamura, Takayuki Suzuki, Hirokazu Otani
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Patent number: 9230750Abstract: An outer peripheral wall surrounds a heating chamber that communicates with an arc chamber through an opening that separates fixed contacts from each other in a circumferential direction. The outer peripheral wall includes a heat-resistive cylindrical heat-flow receiving wall portion that is arranged at a position opposed to the opening in a radial direction, and a cylindrical wall portion that is connected to the heat-flow receiving wall portion in a direction of a center axis and also connected to a fixed-side energizing member at its one end on the opposite side to where the wall portion is connected to the heat-flow receiving wall portion, and is made of an insulating material. With this configuration, the outer peripheral wall surrounding the heating chamber can be protected from damage and heat deterioration due to the influence of hot gas.Type: GrantFiled: October 19, 2011Date of Patent: January 5, 2016Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Toru Yamashita, Daisuke Yoshida, Hirokazu Otani
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Patent number: 9219354Abstract: There is provided a main circuit switchgear that includes a breaker; a leg part that supports the breaker; a disconnector that is connected to the breaker; a leg part that supports the disconnector; a metal container that accommodates therein the breaker and the disconnector and includes a bottom plate in which an opening is provided at a position corresponding to a position of the leg part, where the leg part is fixed onto the bottom plate, and a support frame that includes a top panel on which the bottom plate is placed and a leg part that supports the top panel, where the leg part is fixed onto the top panel via the opening.Type: GrantFiled: September 28, 2011Date of Patent: December 22, 2015Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Manabu Kawakami, Toru Yamashita, Hirokazu Otani, Daisuke Yoshida
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Patent number: 9165732Abstract: A gas circuit breaker includes a sealed tank that includes first and second conductor containers with an insulating tube therebetween and is filled with insulating gas; a fixed arcing contact on the first conductor container side; a movable arcing contact that is provided on the second conductor container side and moves to be able to contact and separate from the fixed arcing contact; a fixed conductive contact on the first conductor container side; a movable conductive contact that moves in accordance with contact and separation of the movable arcing contact and contacts and separates from the fixed conductive contact; and a puffer unit that is provided on the second conductor container side and has a mechanical puffer chamber accommodating the movable conductive contact formed therein, wherein the puffer unit is arranged between the insulating tube and the second conductor container and is exposed to the periphery of the sealed tank.Type: GrantFiled: August 30, 2011Date of Patent: October 20, 2015Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Hirokazu Otani, Toru Yamashita, Daisuke Yoshida, Haruhiko Koyama
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Patent number: 9111697Abstract: Each outermost part of fixed-side connection conductors, fixed-side fixed contacts, movable-side fixed contacts, and movable-side connection conductors are placed outside of an outermost diameter of a fixed-side conductor and a movable-side conductor, as viewed from an axis line of the fixed-side conductor and the movable-side conductor as a center. This arrangement provides a power switchgear that can diminish mutual effects of currents among conduction parts to suppress decrease in a current-carrying capacity for each of the conduction parts and to increase a current-carrying capacity for a total of the conduction parts, without increasing the size of the switchgear.Type: GrantFiled: April 10, 2012Date of Patent: August 18, 2015Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Hirokazu Otani, Toru Yamashita, Daisuke Yoshida
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Publication number: 20150060411Abstract: Provided are: a hermetically-enclosed tank that is filled with insulating gas; a blocking unit that is provided within the hermetically-enclosed tank and is configured with a movable arc contact and a fixed arc contact opposing each other; a plurality of energizing units, within the hermetically-enclosed tank, that are provided around the blocking unit about its axial line as a center and located away from each other; and a fixed-side auxiliary conductor that is provided between a gas space which stores the energizing units and a gas space on the side of the fixed arc contact. A communication hole is formed on the fixed-side auxiliary conductor so as to communicate the gas space provided between the energizing units with the gas space.Type: ApplicationFiled: May 22, 2012Publication date: March 5, 2015Applicant: Mitsubishi Electric CorporationInventors: Toru Yamashita, Daisuke Yoshida, Hirokazu Otani
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Publication number: 20140360850Abstract: Each outermost part of fixed-side connection conductors, fixed-side fixed contacts, movable-side fixed contacts, and movable-side connection conductors are placed outside of an outermost diameter of a fixed-side conductor and a movable-side conductor, as viewed from an axis line of the fixed-side conductor and the movable-side conductor as a center. This arrangement provides a power switchgear that can diminish mutual effects of currents among conduction parts to suppress decrease in a current-carrying capacity for each of the conduction parts and to increase a current-carrying capacity for a total of the conduction parts, without increasing the size of the switchgear.Type: ApplicationFiled: April 10, 2012Publication date: December 11, 2014Applicant: Mitsubishi Electrict CorporationInventors: Hirokazu Otani, Toru Yamashita, Daisuke Yoshida
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Publication number: 20140299578Abstract: A gas circuit breaker includes contact rings formed of an elastically deformable material, a movable contact that moves reciprocally along an axis line direction between a current supply position where the movable contact bridges the contact rings and a current cutoff position where the movable contact is separated from both the contact rings, holding tools formed in an annular shape and respectively attached to the contact rings, a covering member having electrically insulating property, slidably attached to a distal end portion of the holding tool in the axis line direction, and configured to be brought into contact with the contact ring, and a covering member having electrically insulating property, slidably attached to a distal end portion of the holding tool in the axis line direction, and configured to be brought into contact with the contact ring.Type: ApplicationFiled: March 16, 2012Publication date: October 9, 2014Applicant: Mitsubishi Electric CorporationInventors: Toru Yamashita, Daisuke Yoshida, Hirokazu Otani
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Publication number: 20140202991Abstract: An outer peripheral wall surrounds a heating chamber that communicates with an arc chamber through an opening that separates fixed contacts from each other in a circumferential direction. The outer peripheral wall includes a heat-resistive cylindrical heat-flow receiving wall portion that is arranged at a position opposed to the opening in a radial direction, and a cylindrical wall portion that is connected to the heat-flow receiving wall portion in a direction of a center axis and also connected to a fixed-side energizing member at its one end on the opposite side to where the wall portion is connected to the heat-flow receiving wall portion, and is made of an insulating material. With this configuration, the outer peripheral wall surrounding the heating chamber can be protected from damage and heat deterioration due to the influence of hot gas.Type: ApplicationFiled: October 19, 2011Publication date: July 24, 2014Applicant: Mitsubishi Electric CorporationInventors: Toru Yamashita, Daisuke Yoshida, Hirokazu Otani
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Publication number: 20140198429Abstract: There is provided a main circuit switchgear that includes a breaker; a leg part that supports the breaker; a disconnector that is connected to the breaker; a leg part that supports the disconnector; a metal container that accommodates therein the breaker and the disconnector and includes a bottom plate in which an opening is provided at a position corresponding to a position of the leg part, where the leg part is fixed onto the bottom plate, and a support frame that includes a top panel on which the bottom plate is placed and a leg part that supports the top panel, where the leg part is fixed onto the top panel via the opening.Type: ApplicationFiled: September 28, 2011Publication date: July 17, 2014Applicant: Mitsubishi Electric CorporationInventors: Manabu Kawakami, Toru Yamashita, Hirokazu Otani, Daisuke Yoshida