Patents by Inventor Eiji Okumachi
Eiji Okumachi 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: 8770589Abstract: A shaft-seal device for high-temperature fluid including a seal case (2) formed as a metallic cylindrical structure of a single unit and comprised of a main body portion (2a, 2b, 2c), first and second holding portions (2d, 2e), first and second partition portions (2f, 2h), a channel formation portion (2g) forming a minute annular channel (27) with the outer circumference surface of a rotary shaft (1), and an o-ring holding portion (2i). The seal case is installed in an apparatus housing (8) with first and second o-rings (2m, 2n) in between. The intra-seal case region (A1), in which sealing rings (31, 32, 41, 42, 51, 52) of mechanical seals (3, 4, 5) are provided, and the high-temperature fluid region, which is an intra-apparatus housing region (A), are partitioned by a cooling chamber (28) into and from which coolant (82) is supplied and discharged via feed/discharge coolant paths (80, 81).Type: GrantFiled: June 25, 2012Date of Patent: July 8, 2014Assignees: Nippon Pillar Packaging Co., Ltd., Hitachi, Ltd.Inventors: Taiji Hashimoto, Tao Hu, Eiji Okumachi, Masanobu Ninomiya
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Publication number: 20130209777Abstract: A ceramics sliding member for use in ultrapure water or pure water of the present invention is made of a non-continuous-pore SiC sintered body. The non-continuous-pore SiC sintered body includes ?-SiC at a ratio of 20% by weight or more thereto and has an average crystal structure whose aspect ratio is 2 or greater.Type: ApplicationFiled: September 11, 2012Publication date: August 15, 2013Applicants: NIPPON PILLAR PACKING CO., LTD., EBARA CORPORATIONInventors: Hiroshi Nagasaka, Hiroshi Yokota, Junya Kawabata, Hideki Kanno, Kenichi Hoshino, Satoshi Fujiwara, Eiji Okumachi
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Publication number: 20120326394Abstract: A shaft-seal device for high-temperature fluid including a seal case (2) formed as a metallic cylindrical structure of a single unit and comprised of a main body portion (2a, 2b, 2c), first and second holding portions (2d, 2e), first and second partition portions (2f, 2h), a channel formation portion (2g) forming a minute annular channel (27) with the outer circumference surface of a rotary shaft (1), and an o-ring holding portion (2i). The seal case is installed in an apparatus housing (8) with first and second o-rings (2m, 2n) in between. The intra-seal case region (A1), in which sealing rings (31, 32, 41, 42, 51, 52) of mechanical seals (3, 4, 5) are provided, and the high-temperature fluid region, which is an intra-apparatus housing region (A), are partitioned by a cooling chamber (28) into and from which coolant (82) is supplied and discharged via feed/discharge coolant paths (80, 81).Type: ApplicationFiled: June 25, 2012Publication date: December 27, 2012Applicants: Nippon Pillar Packing Co., Ltd., Hitachi Plant Technologies, Ltd.Inventors: Taiji Hashimoto, Tao Hu, Eiji Okumachi, Masanobu Ninomiya
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Publication number: 20100130343Abstract: A ceramics sliding member for use in ultrapure water or pure water of the present invention is made of an SiC sintered body. The SiC sintered body includes ?-SiC at a ratio of 20% or more thereto and has an average crystal structure whose aspect ratio is 2 or greater.Type: ApplicationFiled: April 25, 2008Publication date: May 27, 2010Applicants: EBARA CORPORATION, NIPPON PILLAR PACKING CO., LTD.Inventors: Hiroshi Nagasaka, Hiroshi Yokota, Junya Kawabata, Hideki Kanno, Kenichi Hoshino, Satoshi Fujiwara, Eiji Okumachi
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Patent number: 6431551Abstract: A non-contact-type mechanical seal that keeps a rotary seal ring 6 from vibrating in what is called a pneumatic hammer fashion. For this purpose, an annular space 23 is formed between an outer circumferential surface 21a of the rotary seal ring 6 and an inner circumferential surface 13a of a holder portion 13 of a spring retainer 5. The annular space 23 is sealed by a pair of O rings 22, 22. In addition, seal gas leading passages 24 are provided in the rotary seal ring 6 through which spaces between seal end faces 3a, 6a communicate with the annular space 23. Seal gas 8 is supplied to static pressure generating grooves 15, and led into the annular space 23 through seal gas leading passages 24. The seal gas presses O rings 22, 22 against the outer circumferential surfaces of the rotary seal ring 6 and the inner circumferential surface of the holder portion 13 of the spring retainer 5, thereby firmly holding the rotary seal ring 6.Type: GrantFiled: August 15, 2000Date of Patent: August 13, 2002Assignee: Nippon Pillar Packing Co., Ltd.Inventors: Toshihiko Fuse, Eiji Okumachi
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Publication number: 20010052673Abstract: A shaft sealing apparatus 109 comprising a seal case 1 mounted on a tank shell 102 of rotary equipment, a rotary seal ring 3 fixed to the rotary shaft 106 of the rotary equipment, a stationary seal ring 4 held in the seal case 1 opposite to the rotary seal ring 3 and movable in the axial direction, a coil spring 5 to thrust the stationary seal ring 4 against the rotary seal ring 3, a gas feeding channel 6 formed out of a series of gas passages running through the seal case 1 and the stationary seal ring 4 and opening between the two seal end faces 31, 41 of the two seal rings 3, 4, and a gas jetting mechanism to jet, selectively, a seal gas 71 such as nitrogen and a sterilization gas 72 such as steam through the gas feeding channel 6 into between the seal end faces 31, 41.Type: ApplicationFiled: March 30, 1999Publication date: December 20, 2001Inventors: EIJI OKUMACHI, SATOSHI FUJIWARA, TOSHIHIKO FUSE
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Patent number: 6325378Abstract: A shaft sealing apparatus 109 comprising a seal case 1 mounted on a tank shell 102 of rotary equipment, a rotary seal ring 3 fixed to the rotary shaft 106 of the rotary equipment, a stationary seal ring 4 held in the seal case 1 opposite to the rotary seal ring 3 and movable in the axial direction, a coil spring 5 to thrust the stationary seal ring 4 against the rotary seal ring 3, a gas feeding channel 6 formed out of a series of gas passages running through the seal case 1 and the stationary seal ring 4 and opening between the two seal end faces 31, 41 of the two seal rings 3, 4, and a gas jetting mechanism to jet, selectively, a seal gas 71 such as nitrogen and a sterilization gas 72 such as steam through the gas feeding channel 6 into between the seal end faces 31, 41.Type: GrantFiled: March 30, 1999Date of Patent: December 4, 2001Assignee: Nippon Pillar Packing Co., Ltd.Inventors: Eiji Okumachi, Satoshi Fujiwara, Toshihiko Fuse
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Patent number: 5664787Abstract: A non-contacting shaft sealing device comprises an even number of dynamic pressure generating grooves arranged in the peripheral direction on a sealing end face of either the seal case side or the rotary shaft side. Each dynamic pressure generating groove comprises a shallow L-shaped groove of a specific groove width and depth and includes a fluid lead in part extending in the radial direction from a peripheral edge of the high pressure side of the sealing end face and a dynamic pressure generating part extending in the peripheral direction from the end portion thereof. Each groove is symmetrical with respect to one adjacent groove on one side thereof around a first sealing end face diametral line passing between adjacent fluid lead-in parts or symmetrical with respect to a second groove on the other side around a second sealing end face diametral line passing between the dynamic pressure generating grooves. The groove land ratio .theta..sub.1 /.theta..sub.2 in the peripheral direction is 0.5 to 0.Type: GrantFiled: February 23, 1996Date of Patent: September 9, 1997Assignee: Nippon Pillar Packing Co., Ltd.Inventors: Toshihiko Fuse, Eiji Okumachi
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Patent number: 5529318Abstract: A non-contacting shaft sealing device in which an even-number of dynamic pressure generating groove groups are arranged in the peripheral direction thereof on a sealing end face of the seal case side or a sealing end face of the rotary shaft side. Each dynamic pressure generating groove group is composed of one or plural shallow L-shaped grooves of a specific groove width comprising a fluid lead-in part extending in the radial direction from a peripheral edge of high pressure side of said sealing end face and a dynamic pressure generating part extending in the peripheral direction from the end portion thereof. When the dynamic pressure generating groove group is composed of plural L-shaped grooves, those L-shaped grooves are arranged close to each other at an equal pitch without crossing each other such that the end portion of each dynamic pressure generating part is positioned on a fourth sealing end face diametral line.Type: GrantFiled: March 29, 1995Date of Patent: June 25, 1996Assignee: Nippon Pillar Packing Co., Ltd.Inventors: Toshihiko Fuse, Eiji Okumachi
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Patent number: 5501470Abstract: In a non-contacting shaft sealing device of the type wherein a sealing end face of a case seal and a sealing end face of a rotary shaft seal rotate relative to each other in a non-contacting state while being separated by a film of fluid derived from the high pressure region being sealed, one sealing end face is provided with an even number of dynamic pressure generating groove groups arranged in the peripheral direction on the sealing end face. Each dynamic pressure generating groove group has plural approximately L-shaped linear dynamic pressure generating grooves each composed of a fluid lead-in part extending in the radial direction from the peripheral edge of the sealing end face so as to communicate with the high pressure region, and a dynamic pressure generating part extending in the peripheral direction from the end portion of the fluid lead-in part with the dynamic pressure generating grooves not crossing each other and being arranged in the radial direction.Type: GrantFiled: December 2, 1993Date of Patent: March 26, 1996Assignee: Nippon Pillar Packing Co., Ltd.Inventors: Toshihiko Fuse, Eiji Okumachi
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Patent number: 5398943Abstract: A seal device of the non-contact type having seal faces formed by those end faces of a rotating seal ring and a stationary ring which are perpendicular to axes of the two rings, and also having dynamic pressure generating grooves formed in one of the seal faces at a certain interval in the circumferential direction of the seal face each groove having a first spiral groove portion and a second terminal portion being formed continuous from the front end of each of the first spiral groove portions, extending along the circumferential direction of the seal face but across its corresponding first spiral groove portion, and provided with a closed front end. The seal device can be used at high speed and under high pressure and it can correct the tilting of its seal faces, which is caused by pressure and heat added, to prevent them from being contacted with each other.Type: GrantFiled: November 12, 1992Date of Patent: March 21, 1995Assignee: Nippon Pillar Packing Co., Ltd.Inventors: Tadayuki Shimizu, Toshihiko Fuse, Eiji Okumachi