Patents by Inventor Hidetoshi Nishihara
Hidetoshi Nishihara 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: 8226372Abstract: A compressor includes a motor driven by a controller and having a rotor and a stator, a compressing unit driven by the motor in a hermetic container in which refrigerant is filled. Driving the motor at a low rpm, the controller practices a feedback control which determines a timing of turning on/off switching elements based on a signal detecting a position of the rotor, and when the motor is driven at a high rpm, the controller practices an open-loop control which outputs a given frequency and drives the motor synchronizing with the given frequency. This structure achieves a compressor working with a fewer noises in PWM driving.Type: GrantFiled: March 16, 2004Date of Patent: July 24, 2012Assignee: Panasonic CorporationInventors: Koji Hamaoka, Hidetoshi Nishihara, Katsumi Endo, Makoto Katayama, Shuichi Yakushi, Tatsuyuki Iizuka, Yuji Saiki, Hidehisa Tanaka, Tomonori Ouchiyama
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Publication number: 20080298986Abstract: In a method for assembling an electric compressor which contains a rotor having built-in magnets, magnets in a pre-magnetization state are inserted into a plurality of slots of a magnetizing jib made with a nonmagnetic material. After magnetizing the magnets, the magnetizing jib is fitted to the rotor to have the magnets transferred into magnet slots.Type: ApplicationFiled: July 8, 2008Publication date: December 4, 2008Inventors: Tsuyoshi ISHIDA, Yasuhisa TAKAHASHI, Hidetoshi NISHIHARA
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Patent number: 7415756Abstract: In a method for assembling an electric compressor which contains a rotor having built-in magnets, magnets in a pre-magnetization state are inserted into a plurality of slots of a magnetizing jib made with a nonmagnetic material. After magnetizing the magnets, the magnetizing jib is fitted to the rotor to have the magnets transferred into magnet slots. A magnetizing method and an assembly method for implementing high reliability electric compressors at low manufacturing cost is implemented.Type: GrantFiled: February 23, 2004Date of Patent: August 26, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tsuyoshi Ishida, Yasuhisa Takahashi, Hidetoshi Nishihara
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Patent number: 7381032Abstract: In a hermetic compressor in a freezing refrigerating system or an air-conditioning system such as a refrigerator or a showcase, a construction is disclosed for intending to provide a low-noise hermetic compressor by effectively attenuating a pressure pulsation having occurred in a compression chamber with a suction muffler. By this construction, since a muffler cover 20 has a planar simple shape, the deformation upon molding becomes little and it can come into fully close contact with a muffler main body 19. Therefore, the pressure pulsation hardly leaks through the connecting portion between the muffler main body 19 and the muffler cover 20. The full silencing effect that the suction muffler 18 has is obtained and thereby noise can be reduced more effectively.Type: GrantFiled: November 26, 2001Date of Patent: June 3, 2008Assignee: Matsushita Refrigeration CompanyInventors: Masahiko Osaka, Hidetoshi Nishihara, Toshihiko Ota, Akihiko Kubota, Manabu Motegi, Hiroki Awashima, Takeshi Kojima, Kazuhito Noguchi, Ichiro Kita, Masahiro Kakutani
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Patent number: 7244108Abstract: This invention relates to a hermetic compressor used on a refrigerant cycle such as a refrigerator, and discloses a low noise compressor designed to attenuate a resonance sound in a compression chamber and intake pressure pulsing more operatively at a position adjacent to their sources, which intake pressure pulsing occurs at an intake valve port. In the compressor, a resonance space 38 is provided adjacent to the intake valve port 29 that is closer in distance to a noise source. As a result, noise can be reduced more operatively than muffling functions of an intake muffler 31 do. In addition, although acoustic characteristics of the intake muffler 31 amplify noises having specific frequencies, such noises can be attenuated before being amplified.Type: GrantFiled: November 26, 2001Date of Patent: July 17, 2007Assignee: Matsushita Refrigeration CompanyInventors: Akihiko Kubota, Hidetoshi Nishihara, Masahiko Osaka, Toshihiko Ota, Hiroki Awashima, Manabu Motegi, Kazuhito Noguchi, Takeshi Kojima, Masahiro Kakutani
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Publication number: 20070081908Abstract: An oil pump is provided with helical grooves 142 and 142? carved on the outer periphery of the shaft 125, with an approximately cup-shaped sleeve 146 loosely fit to the outer periphery of the shaft such that the bottom part of the shaft and the bottom plate of the above-mentioned sleeve are engaged in relatively rotatable manner, and with a rotation suppression means for suppressing the rotation of the sleeve. Thereby, even at the low rotation rate operation, oil is raised reliably to compressor unit, offering a highly reliable compressor operation.Type: ApplicationFiled: November 11, 2004Publication date: April 12, 2007Inventor: Hidetoshi Nishihara
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Patent number: 7134847Abstract: The present invention provides an hermetic electric compressor capable of stably supplying oil to a compression chamber with a low noise level. The hermetic electric compressor has a closed vessel, an electric element, a compressing element that is disposed over the electric element and driven by the electric element, and an oil reservoir. The hermetic electric compressor also has an oil supply mechanism for supplying the oil from the oil reservoir to the compressing element in the closed vessel, and a suction muffler that communicates with a refrigerant suction part for sucking a refrigerant into the compressing element and is formed of a box body having a predetermined spatial volume. The suction muffler is positioned below the position where the oil is supplied into the closed vessel, and the box body has at least one oil suction port used for sucking a predetermined amount of oil.Type: GrantFiled: April 26, 2002Date of Patent: November 14, 2006Assignee: Matsushita Refrigeration CompanyInventors: Hidetoshi Nishihara, Yasushi Hayashi, Tomio Maruyama, Tsuyoshi Matsumoto, Ikutomo Umeoka, Akio Yagi
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Patent number: 7021425Abstract: A sealed electric compressor for use in, for example, an electric refrigerator, generates a little noise and can feed any moving part of its compressing element with refrigerator lubricant. An oil pickup tube is joined by insertion to the lowermost end of a crank shaft and includes a first centrifugal pumping portion and a second centrifugal pumping portion provided continuously and arranged at a smaller angle than that of the first centrifugal pumping portion. The second centrifugal pumping portion arranged at a smaller angle can spin in a pool of the refrigerator lubricant.Type: GrantFiled: May 30, 2001Date of Patent: April 4, 2006Assignee: Matsushita Refrigeration CompanyInventors: Kazuhito Noguchi, Akihiko Kubota, Masahiko Osaka, Manabu Motegi, Hidetoshi Nishihara
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Publication number: 20060039807Abstract: A compressor includes a motor driven by a controller and having a rotor and a stator, a compressing unit driven by the motor in a hermetic container in which refrigerant is filled. Driving the motor at a low rpm, the controller practices a feedback control which determines a timing of turning on/off switching elements based on a signal detecting a position of the rotor, and when the motor is driven at a high rpm, the controller practices an open-loop control which outputs a given frequency and drives the motor synchronizing with the given frequency. This structure achieves a compressor working with a fewer noises in PWM driving.Type: ApplicationFiled: March 16, 2004Publication date: February 23, 2006Inventors: Koji Hamaoka, Hidetoshi Nishihara, Katsumi Endo, Makoto Katayama, Shuichi Yakushi, Tatsuyuki Iizuka, Yuji Saiki, Hidehisa Tanaka, Tomonori Ouchiyama
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Publication number: 20060013706Abstract: A compressor which is inexpensive and highly reliable and capable of efficiently and securely drawing up oil in a stable manner even at the time of low-revolution driving is provided. Also, a compressor which is highly reliable and capable of maintaining the structure of a viscous pump in a stable condition for a long period is provided. The compressor has a closed container which stores oil and accommodates a compressing element for compressing gas. The compressing element includes a shaft which vertically extends and rotates and a viscous pump which communicates with oil.Type: ApplicationFiled: March 15, 2004Publication date: January 19, 2006Inventors: Yoshinori Ishida, Hidetoshi Nishihara
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Patent number: 6957951Abstract: In a hermetic compressor for use on an air-conditioning unit as well as a refrigerating unit such as a refrigerator and a showcase, there is disclosed a constitution designed to provide a silently operated hermetic compressor that has an intake muffler readily assembled thereon. The hermetic compressor including a substantially disk-like elastic member disposed between the intake muffler at an outlet thereof and a cylinder head is provided, in which an outlet orifice of the intake muffler constantly remains pressed against an intake valve port through a gasket.Type: GrantFiled: December 20, 2001Date of Patent: October 25, 2005Assignee: Matsushita Refrigeration CompanyInventors: Toshihiko Ota, Hidetoshi Nishihara, Akihiko Kubota, Masahiko Osaka, Manabu Motegi, Kazuhito Noguchi, Takeshi Kojima
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Publication number: 20050210663Abstract: A method for assembling an electric compressor which contains a rotor having built-in magnets. The present invention offers a magnetizing method and an assembly method for implementing high reliability electric compressors at low manufacturing cost. Magnet (130) at pre-magnetization state is inserted into a plurality of slots (104) of magnetizing jig (100) made with a nonmagnetic material. After magnetizing the magnets, magnetizing jig (100) is coupled fitted to the rotor to have the magnets (130) transferred into magnet slots.Type: ApplicationFiled: February 23, 2004Publication date: September 29, 2005Inventors: Tsuyoshi Ishida, Yasuhisa Takahashi, Hidetoshi Nishihara
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Publication number: 20050207920Abstract: In the present invention, resonance chamber (128) is isolated from the inside of the hermetic container due to a seal portion having flange (118) disposed at suction muffler (110) and groove (129) formed in cylinder head (123), and the suction pressure pulsation hardly leaks into the hermetic container, thereby enabling the reduction of noise.Type: ApplicationFiled: February 16, 2004Publication date: September 22, 2005Inventors: Terumasa Ide, Hidetoshi Nishihara, Masahiko Osaka, Tsuyoshi Matsumoto, Kazuhiko Ohno
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Publication number: 20050100456Abstract: In a hermetic compressor in a freezing refrigerating system or an air-conditioning system such as a refrigerator or a showcase, a construction is disclosed for intending to provide a low-noise hermetic compressor by effectively attenuating a pressure pulsation having occurred in a compression chamber with a suction muffler. By this construction, since a muffler cover 20 has a planar simple shape, the deformation upon molding becomes little and it can come into fully close contact with a muffler main body 19. Therefore, the pressure pulsation hardly leaks through the connecting portion between the muffler main body 19 and the muffler cover 20. The full silencing effect that the suction muffler 18 has is obtained and thereby noise can be reduced more effectively.Type: ApplicationFiled: November 26, 2001Publication date: May 12, 2005Inventors: Masahiko Osaka, Hidetoshi Nishihara, Toshihiko Ota, Akihiko Kubota, Manabu Motegi, Hiroki Awashima, Takeshi Kojima, Kazuhito Noguchi, Ichiro Kita, Masahiro Kakutani
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Publication number: 20040120832Abstract: The present invention provides an hermetic electric compressor capable of stably supplying oil to a compression chamber with a low noise level. The hermetic electric compressor has a closed vessel, an electric element, a compressing element that is disposed over the electric element and driven by the electric element, and an oil reservoir. The hermetic electric compressor also has an oil supply mechanism for supplying the oil from the oil reservoir to the compressing element in the closed vessel, and a suction muffler that communicates with a refrigerant suction part for sucking a refrigerant into the compressing element and is formed of a box body having a predetermined spatial volume. The suction muffler is positioned below the position where the oil is supplied into the closed vessel, and the box body has at least one oil suction port used for sucking a predetermined amount of oil.Type: ApplicationFiled: December 18, 2003Publication date: June 24, 2004Inventors: Hidetoshi Nishihara, Yasushi Hayashi, Tomio Maruyama, Tsuyoshi Matsumoto, Ikutomo Umeoka, Akio Yagi
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Publication number: 20040052653Abstract: This invention relates to a hermetic compressor used on a refrigerant cycle such as a refrigerator, and discloses a low noise compressor designed to attenuate a resonance sound in a compression chamber and intake pressure pulsing more operatively at a position adjacent to their sources, which intake pressure pulsing occurs at an intake valve port. In the compressor, a resonance space 38 is provided adjacent to the intake valve port 29 that is closer in distance to a noise source. As a result, noise can be reduced more operatively than muffling functions of an intake muffler 31 do. In addition, although acoustic characteristics of the intake muffler 31 amplify noises having specific frequencies, such noises can be attenuated before being amplified.Type: ApplicationFiled: September 25, 2003Publication date: March 18, 2004Inventors: Akihiko Kubota, Hidetoshi Nishihara, Masahiko Osaka, Hiroki Awashima, Manabu Motegi, Manabu Motegi, Kazuhito Noguchi, Takeshi Kojima, Masahiro Kakutani
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Publication number: 20040037712Abstract: In a hermetic compressor for use on an air-conditioning unit as well as a refrigerating unit such as a refrigerator and a showcase, there is disclosed a constitution designed to provide a silently operated hermetic compressor that has an intake muffler readily assembled thereon. The hermetic compressor including a substantially disk-like elastic member disposed between the intake muffler at an outlet thereof and a cylinder head is provided, in which an outlet orifice of the intake muffler constantly remains pressed against an intake valve port through a gasket.Type: ApplicationFiled: June 5, 2003Publication date: February 26, 2004Inventors: Toshihiko Ota, Hidetoshi Nishihara, Akihiko Kubota, Masahiko Osaka, Manabu Motegi, Kazuhito Noguchi, Takeshi Kojima
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Publication number: 20030161741Abstract: A sealed electric compressor for use in, for example, an electric refrigerator, generates a little noise and can feed any moving part of its compressing element with refrigerator lubricant. An oil pickup tube is joined by insertion to the lowermost end of a crank shaft and includes a first centrifugal pumping portion and a second centrifugal pumping portion provided continuously and arranged at a smaller angle than that of the first centrifugal pumping portion. The second centrifugal pumping portion arranged at a smaller angle can spin in a pool of the refrigerator lubricant.Type: ApplicationFiled: March 27, 2003Publication date: August 28, 2003Inventors: Kazuhito Noguchi, Akihiko Kubota, Masahiko Osaka, Manabu Motegi, Hidetoshi Nishihara
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Patent number: 4531894Abstract: A sealed type motor compressor includes a motor section, a compressor section, a sealed enclosure for resiliently supporting therein the motor section and the compressor section, a suction pipe extending through the sealed enclosure, a suction muffler mounted on the compressor section, an insert pipe received at its one end in an inlet port with a slight clearance therebetween, and a closely coiled spring in the form of a cylinder for interposing between the suction pipe and the insert pipe. A communication pipe is adapted to extend through an aperture formed in the muffler and to be forcedly fitted into a suction port formed in a cylinder head, thereby serving to connect the muffler to the cylinder head.Type: GrantFiled: April 27, 1984Date of Patent: July 30, 1985Assignee: Matsushita Reika Co., Ltd.Inventors: Hideki Kawai, Hidetoshi Nishihara, Seishi Nakaoka, Koushi Hamada