Patents by Inventor Natsuki Kawabata
Natsuki Kawabata 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: 9944880Abstract: In order to prevent deterioration in performance of an oil-free screw compressor and scuffing caused by rust, surfaces of both male and female rotors are coated with heat-resistance coatings containing a solid lubricant. A coating contains Polyimide resin to which Molybdenum disulfide, as a solid lubricant, and Aluminum oxide and Titanium oxide, as additives, are added. Accordingly, it is possible to realize a coating that is higher in heat resistance and longer in lifetime than a conventional one.Type: GrantFiled: July 7, 2014Date of Patent: April 17, 2018Assignees: HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD., KAWAMURA RESEARCH LABORATORIES, INC.Inventors: Yukiko Ikeda, Kazuaki Shiinoki, Masakatsu Okaya, Natsuki Kawabata, Masahiro Kawamura, Iwao Aoki
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Patent number: 9790943Abstract: A scroll-type fluid machine reduces intrusion of abrasion powders, generated by sliding of a conductor causing an orbiting scroll side and a fixed scroll side to be conducted, into a compression chamber, and improves reliability of a compressor. The scroll-type machine includes a casing, a fixed scroll having a flange surface attached to the casing, and a wrap portion provided at an end plate, an orbiting scroll having a wrap portion provided at the end plate, and provided in an opposed relationship with the fixed scroll, a drive shaft connected through a crank portion to the orbiting scroll, an orbiting bearing, a face seal portion arranged between the orbiting scroll and the fixed scroll, a cooling fan, and an orbiting scroll side conductive brush.Type: GrantFiled: January 29, 2015Date of Patent: October 17, 2017Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Kiminori Iwano, Yoshio Kobayashi, Natsuki Kawabata, Toshikazu Harashima, Shumpei Yamazaki
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Patent number: 9328731Abstract: An oil free compressor includes a cooling fan, a low-pressure stage air-cooled heat exchanger, a high-pressure stage air-cooled heat exchanger, and a lubricating oil air-cooled heat exchanger. The cooling fan is provided independently from each of the low-pressure stage air-cooled heat exchanger, the high-pressure stage air-cooled heat exchanger, and the lubricating oil air-cooled heat exchanger.Type: GrantFiled: June 20, 2012Date of Patent: May 3, 2016Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Toshiaki Yabe, Natsuki Kawabata, Masakatsu Okaya, Kohei Sakai
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Patent number: 9145892Abstract: A high reliability water injected scroll air compressor is provided with an orbiting scroll, a fixed scroll corresponding to the orbiting scroll, a motor that generates driving force for making the orbiting scroll orbit the fixed scroll, a compressing path from a suction port to a discharge port, and a portion for injecting water into the compressing path. The operation is controlled by a switching operation in which water is injected into the compressing path and then no water is injected. Corrosion, failure of activation, and concerns about wrap contact when water is injected into an air end are avoided by switching the operation with water injection and the operation without water injection so as to prevent water from remaining in the air end.Type: GrantFiled: January 30, 2014Date of Patent: September 29, 2015Assignee: Hitachi Industrial Equipment Systems, Co., Ltd.Inventors: Natsuki Kawabata, Kazuaki Shiinoki, Hirotaka Kameya, Masakazu Aoki
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Patent number: 9057374Abstract: An oilless screw compressor incorporating water-cooled cooling units for cooling compressed air discharged from compressor bodies having a pair of male and female screw rotors which can be rotated in a contactless and oilless manner, the cooling units comprising a plate type heat-exchanger, and the amount of cooling water for the plate type heat-exchanger being adjustable. With this configuration, a difference between a temperature during load operation and a temperature upon automatic stopping and during unload operation of the compressor can be reduced, so that the cooling unit can be restrained from being damaged or broken within a short period, thereby it is possible to provide a highly reliable oilless screw compressor.Type: GrantFiled: June 20, 2011Date of Patent: June 16, 2015Assignee: HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD.Inventors: Hideki Fujimoto, Hitoshi Nishimura, Natsuki Kawabata
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Publication number: 20150147215Abstract: A scroll-type fluid machine reduces intrusion of abrasion powders, generated by sliding of a conductor causing an orbiting scroll side and a fixed scroll side to be conducted, into a compression chamber, and improves reliability of a compressor. The scroll-type machine includes a casing, a fixed scroll having a flange surface attached to the casing, and a wrap portion provided at an end plate, an orbiting scroll having a wrap portion provided at the end plate, and provided in an opposed relationship with the fixed scroll, a drive shaft connected through a crank portion to the orbiting scroll, an orbiting bearing, a face seal portion arranged between the orbiting scroll and the fixed scroll, a cooling fan, and an orbiting scroll side conductive brush.Type: ApplicationFiled: January 29, 2015Publication date: May 28, 2015Inventors: Kiminori IWANO, Yoshio KOBAYASHI, Natsuki KAWABATA, Toshikazu HARASHIMA, Shumpei YAMAZAKI
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Patent number: 8979515Abstract: A scroll-type fluid machine reduces intrusion of abrasion powders, generated by sliding of a conductor causing an orbiting scroll side and a fixed scroll side to be conducted, into a compression chamber, and improves reliability of a compressor. The scroll-type machine includes a casing, a fixed scroll having a flange surface attached to the casing, and a wrap portion provided at an end plate, an orbiting scroll having a wrap portion provided at the end plate, and provided in an opposed relationship with the fixed scroll, a drive shaft connected through a crank portion to the orbiting scroll, an orbiting bearing, a face seal portion arranged between the orbiting scroll and the fixed scroll, a cooling fan, and an orbiting scroll side conductive brush.Type: GrantFiled: January 19, 2012Date of Patent: March 17, 2015Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Kiminori Iwano, Yoshio Kobayashi, Natsuki Kawabata, Toshikazu Harashima, Shumpei Yamazaki
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Publication number: 20140322058Abstract: In order to prevent deterioration in performance of an oil-free screw compressor and scuffing caused by rust, surfaces of both male and female rotors are coated with heat-resistance coatings containing a solid lubricant. A coating contains Polyimide resin to which Molybdenum disulfide, as a solid lubricant, and Aluminium oxide and Titanium oxide, as additives, are added. Accordingly, it is possible to realize a coating that is higher in heat resistance and longer in lifetime than a conventional one.Type: ApplicationFiled: July 7, 2014Publication date: October 30, 2014Inventors: Yukiko IKEDA, Kazuaki SHIINOKI, Masakatsu OKAYA, Natsuki KAWABATA, Masahiro KAWAMURA, Iwao AOKI
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Patent number: 8801412Abstract: In order to prevent deterioration in performance of an oil-free screw compressor and scuffing caused by rust, surfaces of both male and female rotors are coated with heat-resistance coatings containing a solid lubricant. A coating contains Polyimide resin to which Molybdenum disulfide, as a solid lubricant, and Aluminum oxide and Titanium oxide, as additives, are added. Accordingly, it is possible to realize a coating that is higher in heat resistance and longer in lifetime than a conventional one.Type: GrantFiled: September 29, 2011Date of Patent: August 12, 2014Assignees: Hitachi Industrial Equipment Systems Co., Ltd., Kawamura Research Laboratories, Inc.Inventors: Yukiko Ikeda, Kazuaki Shiinoki, Masakatsu Okaya, Natsuki Kawabata, Masahiro Kawamura, Iwao Aoki
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Publication number: 20140147325Abstract: A high reliability water injected scroll air compressor is provided with an orbiting scroll, a fixed scroll corresponding to the orbiting scroll, a motor that generates driving force for making the orbiting scroll orbit the fixed scroll, a compressing path from a suction port to a discharge port, and a portion for injecting water into the compressing path. The operation is controlled by a switching operation in which water is injected into the compressing path and then no water is injected. Corrosion, failure of activation, and concerns about wrap contact when water is injected into an air end are avoided by switching the operation with water injection and the operation without water injection so as to prevent water from remaining in the air end.Type: ApplicationFiled: January 30, 2014Publication date: May 29, 2014Applicant: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Natsuki KAWABATA, Kazuaki SHIINOKI, Hirotaka KAMEYA, Masakazu AOKI
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Patent number: 8721308Abstract: As pressure in a water tank rapidly rises when water inside a compressor is evaporated by the high temperature of compressed air and this situation makes the operation unstable, an object of the present subject matter is to address this problem. A water injected scroll air compressor is provided with: an air end of the scroll air compressor; a driving unit that generates driving force for the air end; a compressing path from a suction port to a discharge port; a portion to inject water into the compressing path; a discharge piping of air discharged from the air end; a tank provided on a path of the discharge piping for storing water separated from the compressed air; and a cooler that is provided on the path of the discharge piping between the tank and the air end and cools the compressed air discharged from the air end.Type: GrantFiled: February 11, 2011Date of Patent: May 13, 2014Assignee: Hitachi Industrial Equipment Sytems Co., Ltd.Inventors: Kazuaki Shiinoki, Natsuki Kawabata, Hirotaka Kameya
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Patent number: 8672647Abstract: A high reliability water injected scroll air compressor is provided with an orbiting scroll, a fixed scroll corresponding to the orbiting scroll, a motor that generates driving force for making the orbiting scroll orbit the fixed scroll, a compressing path from a suction port to a discharge port, and a portion for injecting water into the compressing path. The operation is controlled by a switching operation in which water is injected into the compressing path and then no water is injected. Corrosion, failure of activation, and concerns about wrap contact when water is injected into an air end are avoided by switching the operation with water injection and the operation without water injection so as to prevent water from remaining in the air end.Type: GrantFiled: February 9, 2011Date of Patent: March 18, 2014Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Natsuki Kawabata, Kazuaki Shiinoki, Hirotaka Kameya, Masakazu Aoki
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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: 8459957Abstract: A water-injected compressor, which injects the water inside the separator 3 into the compressor and discharges the water along with compressed air into the separator and then gains condensed and separated water, has the compressor stopping and then, if staying at a stop for a predetermined duration of time without activating, becoming activated and operating for a set duration of time.Type: GrantFiled: August 23, 2007Date of Patent: June 11, 2013Assignee: Hitachi Industrial Equipment Systems, Co., Ltd.Inventors: Fumio Takeda, Hitoshi Nishimura, Natsuki Kawabata, Masakazu Aoki
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Publication number: 20130136643Abstract: Provided are a structure of arranging a compressor main body and a compressor driving motor at a bottom of a package; including a duct on a top side thereof; arranging an inter cooler on a left side surface of the duct; arranging an after cooler on a top surface thereof; arranging an oil cooler on a front surface thereof; arranging a cooling fan inside of the duct; providing an exhaust port on a bottom surface of the duct; and respectively providing exhaust ducts connected to a top surface of the package on downstream sides of the coolers, and a structure of cooling air suctioned by the cooling fan from the suction port to the inside of the duct, passing through the coolers, and discharged upwardly from the package via the exhaust duct, implementing a compact oil free screw compressor with low noise capable of reducing an installation area.Type: ApplicationFiled: June 20, 2012Publication date: May 30, 2013Applicant: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Toshiaki YABE, Natsuki KAWABATA, Masakatsu OKAYA, Kohei SAKAI
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Publication number: 20120315174Abstract: A scroll-type fluid machine reduces intrusion of abrasion powders, generated by sliding of a conductor causing an orbiting scroll side and a fixed scroll side to be conducted, into a compression chamber, and improves reliability of a compressor. The scroll-type machine includes a casing, a fixed scroll having a flange surface attached to the casing, and a wrap portion provided at an end plate, an orbiting scroll having a wrap portion provided at the end plate, and provided in an opposed relationship with the fixed scroll, a drive shaft connected through a crank portion to the orbiting scroll, an orbiting bearing, a face seal portion arranged between the orbiting scroll and the fixed scroll, a cooling fan, and an orbiting scroll side conductive brush.Type: ApplicationFiled: January 19, 2012Publication date: December 13, 2012Applicant: Hitachi Industrial Equipment Systems Co., LTD.Inventors: Kiminori IWANO, Yoshio Kobayashi, Natsuki Kawabata, Toshikazu Harashima, Shumpei Yamazaki
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Publication number: 20120100029Abstract: In order to prevent deterioration in performance of an oil-free screw compressor and scuffing caused by rust, surfaces of both male and female rotors are coated with heat-resistance coatings containing a solid lubricant. A coating contains Polyimide resin to which Molybdenum disulfide, as a solid lubricant, and Aluminium oxide and Titanium oxide, as additives, are added. Accordingly, it is possible to realize a coating that is higher in heat resistance and longer in lifetime than a conventional one.Type: ApplicationFiled: September 29, 2011Publication date: April 26, 2012Inventors: Yukiko IKEDA, Kazuaki Shiinoki, Masakatsu Okaya, Natsuki Kawabata, Masahiro Kawamura, Iwao Aoki
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Publication number: 20110274574Abstract: As pressure in a water tank rapidly rises when water inside a compressor is evaporated by the high temperature of compressed air and this situation makes the operation unstable, an object of the present subject matter is to address this problem. A water injected scroll air compressor is provided with: an air end of the scroll air compressor; a driving unit that generates driving force for the air end; a compressing path from a suction port to a discharge port; a portion to inject water into the compressing path; a discharge piping of air discharged from the air end; a tank provided on a path of the discharge piping for storing water separated from the compressed air; and a cooler that is provided on the path of the discharge piping between the tank and the air end and cools the compressed air discharged from the air end.Type: ApplicationFiled: February 11, 2011Publication date: November 10, 2011Applicant: Hitachi Industrial Equipment Systems Co., LTD.Inventors: Kazuaki SHIINOKI, Natsuki Kawabata, Hirotaka Kameya
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Publication number: 20110243781Abstract: An oilless screw compressor incorporating water-cooled cooling units for cooling compressed air discharged from compressor bodies having a pair of male and female screw rotors which can be rotated in a contactless and oilless manner, the cooling units comprising a plate type heat-exchanger, and the amount of cooling water for the plate type heat-exchanger being adjustable. With this configuration, a difference between a temperature during load operation and a temperature upon automatic stopping and during unload operation of the compressor can be reduced, so that the cooling unit can be restrained from being damaged or broken within a short period, thereby it is possible to provide a highly reliable oilless screw compressor.Type: ApplicationFiled: June 20, 2011Publication date: October 6, 2011Inventors: Hideki FUJIMOTO, Hitoshi Nishimura, Natsuki Kawabata
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Publication number: 20110194963Abstract: A high reliability water injected scroll air compressor is provided. In the scroll air compressor provided with: an orbiting scroll; a fixed scroll corresponding the orbiting scroll; a motor that generates driving force for making the orbiting scroll orbit the fixed scroll; a compressing path from a suction port to a discharge port; and a portion for injecting water into the compressing path, the operation is controlled by switching operation in which water is injected into the compressing path and operation in which no water is injected. Corrosion, the failure of activation and a touch to the wrap respectively worried when water is injected into an air end are avoided by switching the operation with water injection and the operation without water injection as described above so as to prevent water from remaining in the air end.Type: ApplicationFiled: February 9, 2011Publication date: August 11, 2011Applicant: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Natsuki KAWABATA, Kazuaki SHIINOKI, Hirotaka KAMEYA, Masakazu AOKI