Patents by Inventor Katsumi Hirooka
Katsumi Hirooka 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: 7585160Abstract: A hermetic compressor includes a casing, a compression mechanism in the casing, a container member and a pressure reduction device. The casing includes a high pressure chamber, an intake pipe and a discharge pipe. The high pressure chamber contains lubricant oil that is supplied to the compression mechanism. The container member is a separate body from and communicates with a bottom part of the high pressure chamber so as to allow the lubricant oil to flow to and from the container member. The pressure reduction device sucks gas refrigerant in the container member and sends it to the intake pipe for reducing an inside pressure of the container member. The pressure reduction device is in fluid communication with the intake pipe at a location between the outlet of the evaporator and an inlet of compression mechanism. A refrigerator includes the hermetic compressor.Type: GrantFiled: April 9, 2004Date of Patent: September 8, 2009Assignee: Daikin Industries, Ltd.Inventors: Katsumi Hirooka, Takashi Hikawa
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Publication number: 20050175492Abstract: A high pressure chamber in a casing communicates at the bottom thereof with a liquid retainer. A communication pipe is connected at one end thereof to the upper end of the liquid retainer and connected at the other end thereof to an intake pipe. A gas container and first and second solenoid valves are provided in the communication pipe. When the first solenoid valve is closed and the second solenoid valve (37) is opened, the gas container communicates with the intake pipe to reduce the pressure in the gas container. Thereafter, when the first solenoid valve is opened and the second solenoid valve (37) is closed, the gas container communicates with the liquid retainer to reduce the pressure in the liquid retainer. Then, the pressure of lubricant oil in the liquid retainer is lowered to gasify a refrigerant dissolving in the lubricant oil.Type: ApplicationFiled: April 9, 2004Publication date: August 11, 2005Applicant: Daikin Industries, Ltd.Inventors: Katsumi Hirooka, Takeshi Hikawa
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Patent number: 6361296Abstract: The present invention provides a scroll-type compressor that can supply sufficient lubricating oil without the occurrence of seizure of bearing for an orbiting scroll. In this scroll-type compressor, an annular boss 23 extends downward from the orbiting scroll, and an eccentric pin 53 of a rotating shaft 5 fits into the boss 23 via a bearing 73 and an eccentric bush 54. A gap 58 is provided between the eccentric pin 53 and the eccentric bush 54, and an oil supply path 57 is provided between the eccentric bush 54 and the bearing 73. The lubricating oil flows out of an oil supply hole 52 formed in a rotating shaft 5 and the eccentric pin 53, being supplied to the bearing 73, etc. via the oil supply path 57. In order to sufficiently supply the lubricating oil to the oil supply path 57, a portion 54f extending in an arcuate shape from the upper end face of the eccentric bush 54 forms a protrusion extending upward from the other flat portion 54d.Type: GrantFiled: December 17, 1999Date of Patent: March 26, 2002Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Katsumi Hirooka, Hiroyuki Kobayashi, Susumu Matsuda
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Publication number: 20010001638Abstract: A scroll-type compressor is provided in which the same terminal box can be used irrespective of whether or not the earth is necessary.Type: ApplicationFiled: June 23, 1999Publication date: May 24, 2001Inventor: KATSUMI HIROOKA
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Patent number: 6106254Abstract: A closed-type scroll compressor comprising a closed housing (8) formed with a low-pressure chamber (45) and a high-pressure chamber (44), a scroll-type compression mechanism (C) having a swirling scroll (1) and a fixed scroll (2) and disposed in said low-pressure chamber (45), a frame (6) for fixing said fixed scroll (2) provided with a first oil drainage passage (62), a motor (M) for driving said scroll-type compression mechanism (C) made up of a stator (Mb) provided with a second oil drainage passage (84) and a rotor (Ma), a shaft (5) provided in a second oil drainage passage (52) for transmitting a driving force of said motor (M) to said scroll-type compression mechanism (C), characterized by providing a connection oil drainage passage (93) that is formed by a trough (90) and an inner circumferential surface of said closed housing (8) and whose inlet end is located near an outlet of said first oil drainage passage (62) and whose outlet end is located near an inlet of said second oil drainage passage (84).Type: GrantFiled: July 24, 1998Date of Patent: August 22, 2000Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Katsumi Hirooka, Hisao Mizuno
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Patent number: 6012911Abstract: The present invention provides a scroll-type compressor that can supply sufficient lubricating oil without the occurrence of seizure of bearing for an orbiting scroll. In this scroll-type compressor, an annular boss 23 extends downward from the orbiting scroll, and an eccentric pin 53 of a rotating shaft 5 fits into the boss 23 via a bearing 73 and an eccentric bush 54. A gap 58 is provided between the eccentric pin 53 and the eccentric bush 54, and an oil supply path 57 is provided between the eccentric bush 54 and the bearing 73. The lubricating oil flows out of an oil supply hole 52 formed in a rotating shaft 5 and the eccentric pin 53, being supplied to the bearing 73, etc. via the oil supply path 57. In order to sufficiently supply the lubricating oil to the oil supply path 57, a portion 54f extending in an arcuate shape from the upper end face of the eccentric bush 54 forms a protrusion extending upward from the other flat portion 54d.Type: GrantFiled: May 30, 1997Date of Patent: January 11, 2000Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Katsumi Hirooka, Hiroyuki Kobayashi, Susumu Matsuda
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Patent number: 5988999Abstract: A scroll type fluid machine can suppress an increase of inclining vibrations of an Oldham ring with easier adjustments. A stationary scroll (1) and a swivel scroll (2), in a pair, are engaged with each other, and the swivel scroll (2) is driven to make revolutional motions, while being prevented from rotating, via an Oldham ring (18) disposed between an end plate (6) of the swivel scroll (2) and a frame (10). A distance between the end plate (6) of the swivel scroll (2) and the frame (10) is s and a thickness of a ring portion (19) of the Oldham ring (18) is t, A gap .delta., formed as (s-t) and a radius r of said ring portion (19) of the Oldham ring (18) is set so that .delta./r is 0.01 or less. Thus, by only the ring portion (19) of the Oldham ring (18) being adjusted in its thickness, an increase of inclining vibrations of an Oldham ring (18) can be suppressed.Type: GrantFiled: November 21, 1997Date of Patent: November 23, 1999Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Kazuhiro Sato, Hiroyuki Kobayashi, Katsumi Hirooka
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Patent number: 5584678Abstract: A scroll type fluid machine has a pair of mutually engaged scrolls, one being made of an aluminum material, and the other being made hard. A wear amount of an engaging tip seal and end plate is reduced, and the growth of wear of both elements is equalized. Tip seals (47, 48) are provided at the tips of wraps (12, 16) of the pair of scrolls (10, 14) and are made of a composite plastic material composed of a polyphenylene sulfide as a base material and a carbon fiber, and other materials as filler. The carbon fiber composition rate of the tip seal material of the scroll (10) made of an aluminum material is made higher than the carbon fiber composition rate of the tip seal material of the other scroll (14) made of an aluminum material having a surface treatment or of a ferrous metal or of a ferrous metal having a surface treatment. Thereby the wear amount of each engaging tip seal (47, 48) and end plate (11, 15) is reduced, and simultaneously the growth of wear of both elements is equalized.Type: GrantFiled: September 13, 1995Date of Patent: December 17, 1996Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Katsumi Hirooka, Hiroyuki Kobayashi, Susumu Matsuda
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Patent number: 5316454Abstract: An inexpensive, efficient pump which can supply lubricating oil uses the revolving motion of an orbiting scroll 2. The pump is so constructed that a piston supported by a fixing member 1 is fitted in a cylinder chamber 102 formed in the inner surface of the end plate 21 of an orbiting scroll 2 which revolves while sliding on the fixing member, by which a pump chamber 104 is defined between them. The piston 101 is extended or retracted depending on the revolving motion of orbiting scroll 2, the volume of the pump chamber 104 is increased or decreased, and a fluid suction port 105 and a fluid discharge port 106 are connected to the pump chamber 104 at predetermined time intervals to supply the fluid.Type: GrantFiled: August 11, 1992Date of Patent: May 31, 1994Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Makoto Fujitani, Yukio Nagato, Kimiharu Takeda, Katsumi Hirooka, Tetsuzo Ukai, Toshiyuki Shikanai
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Patent number: 5074761Abstract: A rotary compressor is disclosed which is equipped with a bypass hole for bypassing a fluid under compression to the intake side and the capacity thereof is controlled through opening and closing of the bypass hole with a piston which is operated via a control valve, whereby the bypass hole is opened at or in the vicinity of a discharge port of the compressor and the capacity of the compressor is made to be controllable in the range of one hundred to substantially zero percent. By the application of such a rotary compressor to the compressor for an air conditioner, capacity control in the range of about zero to 100% of discharge quantity can be accomplished so that it becomes possible to obtain cooling capability which is in response to the heat load.Type: GrantFiled: February 4, 1991Date of Patent: December 24, 1991Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Katsumi Hirooka, Takahisa Hirano, Tetsuo Ono, Ryuhei Tanigaki
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Patent number: 5074760Abstract: A rotary compressor is disclosed which is equipped with a bypass hole for bypassing a fluid under compression to the intake side and the capacity thereof is controlled through opening and closing of the bypass hole with a piston which is operated via a control valve, whereby the bypass hole is opened at or in the vicinity of a discharge port of the compressor and the capacity of the compressor is made to be controllable in the range of one hundred to substantially zero percent. By the application of such a rotary compressor to the compressor for an air conditioner, capacity control in the range of about zero to 100% of discharge quantity can be accomplished so that it becomes possible to obtain cooling capability which is in response to the heat load.Type: GrantFiled: July 19, 1989Date of Patent: December 24, 1991Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Katsumi Hirooka, Takahisa Hirano, Tetsuo Ono, Ryuhei Tanigaki