Patents by Inventor Hirokatsu Kohsokabe
Hirokatsu Kohsokabe 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: 8585376Abstract: Disclosed is a water-injection type scroll air compressor whose pre-stopping operation time for drying can be reduced while enhancing compressor efficiency. The compressor body 1 includes a water supply line 24 for supplying water to a water feeder 23 connected to an air suction line 2. The water supply line 24 is provided with a control valve 27 that can control a flow rate of the water. A controller 28 conducts driving control of the control valve 27 in a 5×10?5 to 40×10?5 range of an injected-water volume ratio (more specifically, a volume ratio between an intake air flow rate and injected-water flow rate in the water feeder 23 of the suction line 2) and at the same time, in an injected-water volume ratio range of the compressor characterized so that an increase rate of overall adiabatic efficiency of the compressor per 1×10?5 increase rate of the injected-water volume ratio stays less than 2% of an original or initial value.Type: GrantFiled: August 18, 2010Date of Patent: November 19, 2013Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Hirotaka Kameya, Kazuaki Shiinoki, Natsuki Kawabata, Hirokatsu Kohsokabe
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Patent number: 8241021Abstract: In order to make a displacement type compressor be able to reliably start without increasing an outside diameter dimension of the compressor while using a self-start synchronous motor having high energy efficiency, the displacement type compressor according to the invention includes the self-start synchronous motor which starts as an induction-motor and performs synchronous operation by performing synchronization pull-in almost at a synchronous rotational frequency, a compression part having a compression chamber which compresses a working fluid, and a hermetic container which houses the self-start synchronous motor and the compression part. The displacement type compressor is provided with a start load reducing means which reduces a load of the compression part at startup and is placed at the compression part in the hermetic container.Type: GrantFiled: October 4, 2010Date of Patent: August 14, 2012Assignee: Hitachi Appliances, Inc.Inventors: Takeshi Tsuchiya, Yuuichi Yanagase, Kazuyuki Fujimura, Mutsunori Matsunaga, Shigekazu Nozawa, Kenji Tojo, Haruo Koharagi, Satoshi Kikuchi, Hirokatsu Kohsokabe
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Patent number: 8202057Abstract: An oil-free scroll compressor prevents wraps from being broken and provides improved reliability. The oil-free scroll compressor includes an orbiting scroll member and fixed scroll members, and has compression channels into which water is injected each formed between the intake port and exhaust port provided in the fixed scroll member. The oil-free scroll compressor includes temperature sensors each of which detects temperature in the compression channel, regulating valves each of which controls ratio of the amount of the water to be injected into the respective compression channels to the total amount of the water to be injected into the compression channels, and controller which controls the opening degrees of the regulating valves such that a difference between the detected temperatures from the compression channels is small.Type: GrantFiled: August 18, 2009Date of Patent: June 19, 2012Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Hirokatsu Kohsokabe, Hirotaka Kameya, Kazuaki Shiinoki, Toshiaki Yabe
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Publication number: 20110129362Abstract: Disclosed is a water-injection type scroll air compressor whose pre-stopping operation time for drying can be reduced while enhancing compressor efficiency. The compressor body 1 includes a water supply line 24 for supplying water to a water feeder 23 connected to an air suction line 2. The water supply line 24 is provided with a control valve 27 that can control a flow rate of the water. A controller 28 conducts driving control of the control valve 27 in a 5×10?5 to 40×10?5 range of an injected-water volume ratio (more specifically, a volume ratio between an intake air flow rate and injected-water flow rate in the water feeder 23 of the suction line 2) and at the same time, in an injected-water volume ratio range of the compressor characterized so that an increase rate of overall adiabatic efficiency of the compressor per 1×10?5 increase rate of the injected-water volume ratio stays less than 2% of an original or initial value.Type: ApplicationFiled: August 18, 2010Publication date: June 2, 2011Inventors: Hirotaka KAMEYA, Kazuaki Shiinoki, Natsuki Kawabata, Hirokatsu Kohsokabe
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Publication number: 20110020161Abstract: In order to make a displacement type compressor be able to reliably start without increasing an outside diameter dimension of the compressor while using a self-start synchronous motor having high energy efficiency, the displacement type compressor according to the invention includes the self-start synchronous motor which starts as an induction-motor and performs synchronous operation by performing synchronization pull-in almost at a synchronous rotational frequency, a compression part having a compression chamber which compresses a working fluid, and a hermetic container which houses the self-start synchronous motor and the compression part. The displacement type compressor is provided with a start load reducing means which reduces a load of the compression part at startup and is placed at the compression part in the hermetic container.Type: ApplicationFiled: October 4, 2010Publication date: January 27, 2011Applicant: Hitachi Appliances, Inc.Inventors: Takeshi TSUCHIYA, Yuuichi Yanagase, Kazuyuki Fujimura, Mutsunori Matsunaga, Shigekazu Nozawa, Kenji Tojo, Haruo Koharagi, Satoshi Kikuchi, Hirokatsu Kohsokabe
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Publication number: 20100158733Abstract: An oil-free scroll compressor prevents wraps from being broken and provides improved reliability. The oil-free scroll compressor includes an orbiting scroll member and fixed scroll members, and has compression channels into which water is injected each formed between the intake port and exhaust port provided in the fixed scroll member. The oil-free scroll compressor includes temperature sensors each of which detects temperature in the compression channel, regulating valves each of which controls ratio of the amount of the water to be injected into the respective compression channels to the total amount of the water to be injected into the compression channels, and controller which controls the opening degrees of the regulating valves such that a difference between the detected temperatures from the compression channels is small.Type: ApplicationFiled: August 18, 2009Publication date: June 24, 2010Inventors: Hirokatsu Kohsokabe, Hirotaka Kameya, Kazuaki Shinoki, Toshiaki Yabe
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Publication number: 20090010776Abstract: In order to make a displacement type compressor be able to reliably start without increasing an outside diameter dimension of the compressor while using a self-start synchronous motor having high energy efficiency, the displacement type compressor according to the invention includes the self-start synchronous motor which starts as an induction-motor and performs synchronous operation by performing synchronization pull-in almost at a synchronous rotational frequency, a compression part having a compression chamber which compresses a working fluid, and a hermetic container which houses the self-start synchronous motor and the compression part. The displacement type compressor is provided with a start load reducing means which reduces a load of the compression part at startup and is placed at the compression part in the hermetic container.Type: ApplicationFiled: September 10, 2008Publication date: January 8, 2009Applicant: Hitachi Appliances, Inc.Inventors: Takeshi Tsuchiya, Yuuichi Yanagase, Kzuyuki Fujimura, Mutsunori Matsunaga, Shigekazu Nozawa, Kenji Tojo, Haruo Koharagi, Satoshi Kikuchi, Hirokatsu Kohsokabe
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Patent number: 7442017Abstract: In order to make a displacement type compressor be able to reliably start without increasing an outside diameter dimension of the compressor while using a self-start synchronous motor having high energy efficiency, the displacement type compressor according to the invention includes the self-start synchronous motor which starts as an induction-motor and performs synchronous operation by performing synchronization pull-in almost at a synchronous rotational frequency, a compression part having a compression chamber which compresses a working fluid, and a hermetic container which houses the self-start synchronous motor and the compression part. The displacement type compressor is provided with a start load reducing means which reduces a load of the compression part at startup and is-placed at the compression part in the hermetic container.Type: GrantFiled: December 27, 2005Date of Patent: October 28, 2008Assignee: Hitachi Appliances, Inc.Inventors: Takeshi Tsuchiya, Yuuichi Yanagase, Kazuyuki Fujimura, Mutsunori Matsunaga, Shigekazu Nozawa, Kenji Tojo, Haruo Koharagi, Satoshi Kikuchi, Hirokatsu Kohsokabe
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Patent number: 7438539Abstract: A hermetic type scroll compressor according to the invention includes a scroll compressor element in which an end plate of a orbiting scroll and an end plate of a fixed scroll are assembled such that they slide against each other, an electric motor element which drives the scroll compressor element, a hermetic casing housing the scroll compressor element and the electric motor element and holding lubricating oil collected at a bottom thereof, and an oil separator disposed on a discharge side of the scroll compressor element. An interior of the hermetic casing is kept at an intermediate pressure between a suction pressure and a discharge pressure. An oil return mechanism is provided, which intermittently returns lubricating oil from the oil separator to sliding parts of the orbiting scroll end plate and the fixed scroll end plate. The hermetic type scroll compressor 31 can be improved in performance and reliability while promoting cost reduction.Type: GrantFiled: March 24, 2006Date of Patent: October 21, 2008Assignees: Hitachi Air Conditioning Systems Co., Ltd, The Tokyo Electric Power Company, IncorporatedInventors: Hirokatsu Kohsokabe, Kazuto Higa, Kenji Tojo, Daisuke Kuboi
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Publication number: 20060216182Abstract: A hermetic type scroll compressor according to the invention includes a scroll compressor element in which an end plate of a orbiting scroll and an end plate of a fixed scroll are assembled such that they slide against each other, an electric motor element which drives the scroll compressor element, a hermetic casing housing the scroll compressor element and the electric motor element and holding lubricating oil collected at a bottom thereof, and an oil separator disposed on a discharge side of the scroll compressor element. An interior of the hermetic casing is kept at an intermediate pressure between a suction pressure and a discharge pressure. An oil return mechanism is provided, which intermittently returns lubricating oil from the oil separator to sliding parts of the orbiting scroll end plate and the fixed scroll end plate. The hermetic type scroll compressor 31 can be improved in performance and reliability while promoting cost reduction.Type: ApplicationFiled: March 24, 2006Publication date: September 28, 2006Inventors: Hirokatsu Kohsokabe, Kazuto Higa, Kenji Tojo, Daisuke Kuboi
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Publication number: 20060140792Abstract: In order to make a displacement type compressor be able to reliably start without increasing an outside diameter dimension of the compressor while using a self-start synchronous motor having high energy efficiency, the displacement type compressor according to the invention includes the self-start synchronous motor which starts as an induction-motor and performs synchronous operation by performing synchronization pull-in almost at a synchronous rotational frequency, a compression part having a compression chamber which compresses a working fluid, and a hermetic container which houses the self-start synchronous motor and the compression part. The displacement type compressor is provided with a start load reducing means which reduces a load of the compression part at startup and is-placed at the compression part in the hermetic container.Type: ApplicationFiled: December 27, 2005Publication date: June 29, 2006Applicant: Hitachi Air Conditioning Systems Co., Ltd.Inventors: Takeshi Tsuchiya, Yuuichi Yanagase, Kazuyuki Fujimura, Mutsunori Matsunaga, Shigekazu Nozawa, Kenji Tojo, Haruo Koharagi, Satoshi Kikuchi, Hirokatsu Kohsokabe
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Patent number: 6923016Abstract: In a refrigerant cycle apparatus, an energy-saving operation is performed by using a refrigerant which is used in a supercritical state. A refrigeration cycle apparatus is constituted by a main compressor, an expander, a sub compressor independently placed in an upstream side of the main compressor, a use side heat exchanger, a heat source side heat exchanger and the like. A refrigerant such as a carbon dioxide or the like which is used in a supercritical state is employed as the refrigerant. The sub compressor is driven by utilizing a recovered energy by the expanding device. Further, a refrigerant tank is provided, and properly controls an amount of the refrigerant circulating in the refrigerant cycle.Type: GrantFiled: April 7, 2004Date of Patent: August 2, 2005Inventors: Sunao Funakoshi, Hirokatsu Kohsokabe, Kazuhiro Endoh, Kenji Tojo, Hiroaki Matsushima
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Patent number: 6905318Abstract: A compressor includes a compression chamber for compressing working fluid within an inside thereof, a discharge port, through which the working fluid flows out from the compression chamber, and a discharge valve for opening or closing the discharge port. The discharge valve includes a valve seat portion provided in the discharge port and having a tapered surface, so that a cross-section area of the discharge port comes to be large from a side of the compression chamber. The valve has a projection portion having a tapered surface in contact with the tapered surface of the valve seat portion. A spring is provided on a member formed in one body with the valve seat portion, for positioning the valve to the valve seat portion, wherein clearance volume of the discharge port is reduced, so as to improve the performances thereof.Type: GrantFiled: July 25, 2001Date of Patent: June 14, 2005Assignee: Hitachi, Ltd.Inventors: Takeshi Kouno, Hirokatsu Kohsokabe, Isao Hayase, Kenichi Oshima, Akihiko Ishiyama
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Publication number: 20040200233Abstract: In a refrigerant cycle apparatus, an energy-saving operation is performed by using a refrigerant which is used in a supercritical state. A refrigeration cycle apparatus is constituted by a main compressor, an expander, a sub compressor independently placed in an upstream side of the main compressor, a use side heat exchanger, a heat source side heat exchanger and the like. A refrigerant such as a carbon dioxide or the like which is used in a supercritical state is employed as the refrigerant. The sub compressor is driven by utilizing a recovered energy by the expanding device. Further, a refrigerant tank is provided, and properly controls an amount of the refrigerant circulating in the refrigerant cycle.Type: ApplicationFiled: April 7, 2004Publication date: October 14, 2004Inventors: Sunao Funakoshi, Hirokatsu Kohsokabe, Kazuhiro Endoh, Kenji Tojo, Hiroaki Matsushima
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Patent number: 6406279Abstract: A displacement type fluid machine has a sliding contact portion between a cylinder 4 and a displacer 5 made into a predetermined section, and the cylinder and the displacer so contoured that when they are made concentric, the normal distance in the sliding contact section between the cylinder contour and the displacer contour may be smaller than that of the remaining section, thereby to decrease the radial gap to lower the internal leakage of the working fluid and to improve the performance and the reliability.Type: GrantFiled: March 16, 2001Date of Patent: June 18, 2002Assignee: Hitachi, Ltd.Inventors: Hirokatsu Kohsokabe, Masahiro Takebayashi, Shunichi Mitsuya, Hiroaki Hata, Yasuhiro Ohshima, Kenji Tojo
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Patent number: 6352418Abstract: A displacement type fluid machine which is easier to machine and assemble than a scroll type fluid machine and has high performance and low cost. A displacer is revolved in a cylinder having an inside wall formed by a curve such that a planar shape is continuous, whereby a working fluid is discharged through a plurality of discharge ports, there is provided a driving unit in which the orbiting radius of the displacer is variable along the shape of a movement line contact portion of the cylinder and the displacer.Type: GrantFiled: March 8, 2000Date of Patent: March 5, 2002Assignee: Hitachi, Ltd.Inventors: Hirokatsu Kohsokabe, Kunihiko Takao, Masahiro Takebayashi, Isao Hayase, Hiroaki Hata, Shigetaroo Tagawa, Kenji Tojo, Takeshi Kouno
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Publication number: 20020012595Abstract: A compressor, comprising: a compression chamber for compressing working fluid within an inside thereof; a discharge port, through which the working fluid flows out from the compression chamber; a valve means for opening or closing the discharge port; a valve seat portion being provided in the discharge port and having a shape of curved surfaces, so that a cross-section area of the discharge port comes to be large from a side of the compression chamber; a valve having a projection portion having a curved surface in contact with the curved surface of the valve seat portion; and a means being provided on a member formed in one body with the valve seat portion, for positioning the valve to the valve seat portion, wherein clearance volume of the discharge port is reduced, so as to improve the performances thereof.Type: ApplicationFiled: July 25, 2001Publication date: January 31, 2002Inventors: Takeshi Kouno, Hirokatsu Kohsokabe, Isao Hayase, Kenichi Oshima, Akihiko Ishiyama
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Patent number: 6332763Abstract: In order to provide a displacement type fluid machine for reducing a fluid loss of a discharge process as much as that of a scroll fluid machine, easily prepared than the scroll fluid machine, in the displacement type fluid machine wherein a shaft is gyrated in a hollow cylinder whose section shape comprises a series of curves so that a working fluid is discharged from a plurality of discharge ports, a shaft angle &thgr;c of a compression process of each working chamber is given by the following algorithm: (((N−1)/N·360°)<&thgr;c≦360° (where, N is the number of threads).Type: GrantFiled: June 13, 2000Date of Patent: December 25, 2001Assignee: Hitachi, Ltd.Inventors: Hirokatsu Kohsokabe, Masahiro Takebayashi, Hiroaki Hata, Koichi Inaba, Isao Hayase, Kenji Tojo
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Patent number: 6332764Abstract: A displacement type fluid machine for reducing a fluid loss of a discharge process as much as that of a scroll fluid machine has a displacer which is provided with at least one through hole for working the outer wall surface of said displacer during manufacture of said displacer, said at least one through hole extending in an axial direction of a rotating shaft.Type: GrantFiled: June 13, 2000Date of Patent: December 25, 2001Assignee: Hitachi, Ltd.Inventors: Hirokatsu Kohsokabe, Masahiro Takebayashi, Hiroaki Hata, Koichi Inaba, Isao Hayase, Kenji Tojo
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Patent number: 6312237Abstract: In a displacement type fluid machine wherein a space is formed by the inner wall surface of a cylinder and the outer wall surface of a displacer when the center of the cylinder is located on the center of the displacer, and a plurality of working chambers is formed when the positional relationship between the displacer and cylinder is for a gyration, the wear is reduced between the cylinder and displacer. Sliding portions between the displacer 5 and a cylinder 4 are fed with a lubricating oil 12 by forming an oil-feeding groove 5c in the surface of the displacer 5 so as to extend from the central portion of the displacer 5 to the vicinity of a suction port 7a, and feeding the lubricating oil 12 from the central portion of the displacer 5, so that the wear can be reduced.Type: GrantFiled: March 6, 2001Date of Patent: November 6, 2001Assignee: Hitachi, Ltd.Inventors: Takeshi Kouno, Hirokatsu Kohsokabe, Masahiro Takebayashi, Shunichi Mitsuya, Shigetaro Tagawa, Yasuhiro Ohshima, Kingo Moriyama