Patents by Inventor Akio Yagi
Akio Yagi 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: 20210123426Abstract: A hermetic refrigerant compressor (100) includes a sealed container (101) in which lubricating oil (103) having a kinematic viscosity in a range of 1 to 9 mm2/S at 40° C. is stored, the lubricating oil (103) containing a sliding modifier that is either sulfur or a sulfur-containing compound. A compression element (107) includes a shaft part that is a crank shaft (108). In a case where a sliding surface of a main shaft (109) is a single sliding surface, a length of the single sliding surface in an axial direction is a single sliding length L, whereas in a case where the sliding surface is divided into a plurality of sliding surfaces, a length of one of the sliding surfaces in the axial direction, the one sliding surface having the least length in the axial direction among the plurality of sliding surfaces, is the single sliding length L, and a ratio L/D of the single sliding length L to an external diameter D of the main shaft (109) is less than or equal to 0.51.Type: ApplicationFiled: June 25, 2019Publication date: April 29, 2021Applicant: Panasonic Appliances Refrigeration Devices SingaporeInventors: Hiroto HAYASHI, Hirotaka KAWABATA, Terumasa IDE, Hironari AKASHI, Masanobu GONDO, Akio YAGI
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Publication number: 20190285063Abstract: Inside a sealed container (101) of a refrigerant compressor (100), lubricating oil (103) having a kinematic viscosity at 40° C. of 0.1 mm2/S to 5.1 mm2/S is stored, and an electric element (106) and a compression element (107) are accommodated. The compression element (107) is provided with, as a shaft part, a crankshaft (108) comprising a main shaft (109) and an eccentric shaft (110), and as bearing parts, a main bearing (114) that axially supports the main shaft (109) and an eccentric bearing (119) that axially supports the eccentric shaft (110). At least one surface of the main shaft (109) and the eccentric shaft (110) is subjected to a surface treatment, e.g., formation of an oxide film, having a hardness equal to or greater than that of a bearing part (the main bearing (114) or the eccentric bearing (119)). Satisfactory reliability in sliding parts can thereby be achieved even if lubricating oil having lower viscosity is used.Type: ApplicationFiled: November 28, 2017Publication date: September 19, 2019Applicant: Panasonic Appliances Refrigeration Devices SingaporeInventors: Yasushi HAYASHI, Hirotaka KAWABATA, Yoshinori ISHIDA, Shingo OYAGI, Terumasa IDE, Akio YAGI, Hironari AKASHI, Hiroto HAYASHI, Kazuhiro YOKOTA, Hiroki TORIMASU
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Publication number: 20150211507Abstract: A sealed compressor according to the present invention includes: an electric component (110) including a stator (114) and a rotor (116); a compression component (112); and a sealed container (102) configured to accommodate the electric component (110) and the compression component (112) and store lubricating oil (104). The compression component (112) includes: a shaft (118) including a main shaft section (120) and an eccentric shaft section (122); a cylinder block (124); a main bearing (126) provided at the cylinder block (124) and supporting the main shaft section (120); and a thrust rolling bearing (176) provided at a thrust surface (160) of the main bearing (126). The thrust rolling bearing (176) includes: a plurality of rolling elements (166) held by the cage (168); an upper race (164); and a lower race (170). A ring-shaped, flat, thin plate (180) is provided between the lower race (170) and the thrust surface (160) of the main bearing (16).Type: ApplicationFiled: August 29, 2013Publication date: July 30, 2015Inventors: Terumasa Ide, Akio Yagi
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Patent number: 9051937Abstract: A refrigerant compressor comprises an electric element; a compression element; and a sealed container; wherein the compression element includes: a crankpin; a piston pin; and a connecting rod having a large hole portion into which the crankpin is inserted, a small hole portion in which the piston pin is rotatably disposed, and a coupling rod portion; wherein an oil guide hole is provided in the coupling rod portion of the connecting rod such that the large hole portion and the small hole portion are communicated with each other via the oil guide hole; a circular first groove is provided on an outer peripheral surface of the piston pin such that the first groove communicates with the oil guide hole; and a second groove extending in a center axis direction of the piston pin is provided in a first region of the small hole portion of the connecting rod.Type: GrantFiled: November 9, 2012Date of Patent: June 9, 2015Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Akihiko Kubota, Jun Sato, Akio Yagi, Masato Morishima, Yuji Mori
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Patent number: 8651831Abstract: The present invention comprises a suspension spring and snubber arrangement for reducing transmitted noise from a reciprocating compressor at ?-octave frequency band of 500 Hz and preventing the occurrence of resonance frequency during the reciprocating compressor operation, the arrangement comprising: the suspension spring having a plurality of coils and two opposing open ends; at least one snubber for maintaining the integrity and shape of the suspension spring and for preventing displacement of the suspension spring from their intended position; wherein at least one open end of the suspension spring is loosely fitted over the at least one snubber; and further wherein an internal diameter of the suspension spring is larger than a outer diameter of the snubber so that a gap is defined between the suspension spring and the snubber for minimizing physical contact between the suspension spring and the snubber.Type: GrantFiled: June 9, 2005Date of Patent: February 18, 2014Assignee: Panasonic Refrigeration Devices Singapore Pte LtdInventors: Akio Yagi, Kar Hoe Chan, Hideki Kawai, Hiroshi Sasano, Chew Thong Khoo
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Publication number: 20110176942Abstract: A hermetic compressor includes a cylindrical hole (117) forming a compression space (115) and having a tapered portion (127) so as to increase its inner diameter from the top dead center to the bottom dead center of a piston (123). The piston (123) is reversed in its inclination direction with respect to the axial center of the cylindrical hole (117) in the initial stage of the compression stroke. This reduces the contact between the piston (123) and the cylindrical hole (117) at the time of the reversal, as compared with the case in which the piston (123) is reversed in its inclination direction in the middle or later stage of the compression stroke. As a result, the hermetic compressor is reliable and has low noise level.Type: ApplicationFiled: October 19, 2009Publication date: July 21, 2011Applicant: Panasonic CarporationInventors: Akio Yagi, Ichiro Morita
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Publication number: 20100158711Abstract: Oil sucked by an oil pump and supplied to an opening at an eccentric shaft flows on the top end face of the eccentric shaft to the outer periphery thereof, and splashes from an edge in substantially a radial direction onto the sliding portions of a cylinder and a piston. Thus, the oil can cool the cylinder and piston, form oil film on the sliding portions of the cylinder and piston, restrain metallic contact between the sliding portions, and prevent abrasion between the sliding portions and increasing input into the compressor.Type: ApplicationFiled: November 7, 2007Publication date: June 24, 2010Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventor: Akio Yagi
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Publication number: 20090291007Abstract: In a stopper, by providing, in a position corresponding to a movable end vicinity of a discharge reed, a first regulation part having a predetermined clearance from the movable end vicinity of the discharge reed, since a hermetic compressor has such a two-stage spring characteristic that, until the movable end vicinity of the discharge reed touches the first regulation part, a spring characteristic is weak and, after the touch, the spring characteristic is strong, and there is obtained a discharge valve device which is easy to open and whose closing speed is rapid, it is possible to improve a delay in closing.Type: ApplicationFiled: April 24, 2007Publication date: November 26, 2009Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Masakazu Yamaoka, Akio Yagi, Tsuyoshi Matsumoto
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Publication number: 20090010788Abstract: Stopper contains abutment section at a position that corresponds to arm section so as to keep a clearance from arm section of discharge reed. The structure above allows discharge reed to have two-stage spring characteristics; discharge reed exhibits a weaker springiness until arm section abuts against abutment section, and then exhibits a stronger springiness after the abutment. Employing the discharge reed having the two-stage characteristics allows discharge valve unit to easily open and quickly close without delay. Such structured hermetic compressor enhances energy efficiency, preventing degradation in refrigeration performance.Type: ApplicationFiled: September 20, 2006Publication date: January 8, 2009Inventors: Masakazu Yamaoka, Akio Yagi, Tsuyoshi Matsumoto
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Patent number: 7380774Abstract: A humidifier is superior in terms of hygiene, simple in terms of maintenance, humidity is easily adjusted, and energy consumption is low. The humidifier uses, as a moisture permeable membrane, a moisture-permeable polyurethane obtained by using, as raw materials, at least an isocyanate component, a diol as a chain extender, and polyethylene glycol as a polyol component, and reacting these raw materials.Type: GrantFiled: May 17, 2004Date of Patent: June 3, 2008Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Yasuhiro Akita, Shunichi Hayashi, Hiroshi Mizutani, Norio Miwa, Akio Yagi, Takashi Nitta, Tadao Takahashi, Izumi Tanaka
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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: 7052248Abstract: A hermetic compressor is equipped with a suction muffler including: a muffling space having two rooms; a communication space to communicate these two rooms with each other; a first communication passage to communicate a movable valve with the muffling space and extending to an opening into the muffling space; and a second communication passage to communicate an enclosed container with the muffling space and extending to an opening into the muffling space. The openings into the muffling space from the first and the second communication passages are disposed in one of the two rooms, and the other room of the two rooms forms a resonance muffler whose resonance frequency matches a cavity resonance frequency of the enclosed container. The configuration can provide the hermetic compressor with a reduced noise emission and a high compression efficiency.Type: GrantFiled: December 3, 2002Date of Patent: May 30, 2006Assignee: Matsushita Refrigeration CompanyInventors: Akio Yagi, Ikutomo Umeoka, Tsuyoshi Matsumoto, Yasushi Hayashi, Tomio Maruyama
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Publication number: 20060024175Abstract: The present invention comprises a suspension spring and snubber arrangement for reducing transmitted noise from a reciprocating compressor at ?-octave frequency band of 500 Hz and preventing the occurrence of resonance frequency during the reciprocating compressor operation, the arrangement comprising: the suspension spring having a plurality of coils and two opposing open ends; at least one snubber for maintaining the integrity and shape of the suspension spring and for preventing displacement of the suspension spring from their intended position; wherein at least one open end of the suspension spring is loosely fitted over the at least one snubber; and further wherein an internal diameter of the suspension spring is larger than a outer diameter of the snubber so that a gap is defined between the suspension spring and the snubber for minimizing physical contact between the suspension spring and the snubber.Type: ApplicationFiled: June 9, 2005Publication date: February 2, 2006Inventors: Akio Yagi, Kar Chan, Hideki Kawai, Hiroshi Sasano, Chew Khoo
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Publication number: 20050252982Abstract: There is provided a humidifier superior in terms of hygiene, simple in terms of maintenance, wherein humidity is easily adjusted, and energy consumption is low. The humidifier uses as a moisture permeable membrane, a moisture-permeable polyurethane obtained by using as raw materials, at least an isocyanate component, a diol as a chain extender, and polyethylene glycol as a polyol component, and reacting these raw materials.Type: ApplicationFiled: May 17, 2004Publication date: November 17, 2005Inventors: Yasuhiro Akita, Shunichi Hayashi, Hiroshi Mizutani, Norio Miwa, Akio Yagi, Takashi Nitta, Tadao Takahashi, Izumi Tanaka
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Publication number: 20040241011Abstract: Disclosed is a hermetic compressor equipped with a suction muffler comprising; a muffling space having two rooms; a communication space to communicate these two rooms with each other; a first communication passage to communicate a movable valve with the muffling space and extending to an opening to the muffling space; and a second communication passage to communicate a enclosed container with the muffling space and extending to an opening to the muffling space. The openings to the muffling space from the first and the second communication passages are disposed in one of the two rooms, and the other room of the two rooms forms a resonance muffler whose resonance frequency matches with an cavity resonance frequency of the enclosed container. The configuration can provide the hermetic compressor with a reduced noise emission and a high compression efficiency.Type: ApplicationFiled: March 12, 2004Publication date: December 2, 2004Inventors: Akio Yagi, Ikutomo Umeoka, Tsuyoshi Matsumoto, Yasushi Hayashi, Tomio Maruyama
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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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Patent number: 6152703Abstract: The present invention provides a hermetic-type compressor delivering high refrigeration capability at low noise. The hermetic-type compressor of the present invention is provided with a position adjustment mechanism, a communication/shutoff mechanism, a passage changeover mechanism or the like so as to dispose the opening end of a suction passage, which is provided in an enclosed container and used to communicate the cylinder of its compressor with the enclosed container, on a predetermined plane so that the opening end is aligned with the position of a node of a resonance mode generated in the enclosed container.Type: GrantFiled: May 21, 1998Date of Patent: November 28, 2000Assignee: Matsushita Refrigeration CompanyInventors: Takao Yoshimura, Hironari Akashi, Akio Yagi, Akira Hayashi
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Patent number: 4347903Abstract: A weighing balance to provide an average weight to an object which tends to move while being weighed such as a laboratory animal. The object to be weighed is placed on a receiving pan which provides an electrical analog output signal corresponding to the weight of the object. This signal after passing through an amplifier is converted to a digital electrical signal fed to a data input control means. A level detector setting means allows an output from said control means only when the weight on the balance reaches a predetermined level. The output from the control means is fed to a memory having a plurality of registers which store this information. Coupled on one side to this memory is a comparator which is also coupled on a second side to said control means. Also coupled to said comparator means is an allowable range means, sampling time means, and average calculating means. The average calculating means feeds an output to a printer.Type: GrantFiled: March 10, 1980Date of Patent: September 7, 1982Assignee: Shimadzu CorporationInventors: Shozo Yano, Toshiyuki Miyake, Yasuhiro Fujinaga, Akira Koomoto, Toshio Kawara, Akio Yagi, Tomohiro Tsuji, Tadashi Nagaoka