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1. 发明专利

JP2002279868A VACUUM VALVE 失效
公开(公告)号：JP2002279868A
公开(公告)日：2002-09-27
申请号：JP2001075372
申请日：2001-03-16
申请人： TOSHIBA IT & CONTROL SYS CORP , TOSHIBA CORP
发明人： TOMOMITSU KOICHI , MIYATA KIYOTAKA , NIWA YOSHIMITSU , YOKOKURA KUNIO , SASAGE KOSUKE , NITTA YOSHIMI
IPC分类号： H01H33/66
摘要： PROBLEM TO BE SOLVED: To provide a vacuum valve with improved breaking current and energization current per size of an electrode in diminished size of itself and the electrode. SOLUTION: Positional relation of a pair of cup-shaped electrodes 1 each having a slit is to be asymmetric against the plane positioned in the middle of the two electrodes. By doing so, driving forces generated by each electrode have a strong and a weak positions, which lessens fluctuation of the driving forces by the two electrodes according to the position of an arc 6.

2. 发明专利

JP2000294086A VACUUM VALVE 失效
公开(公告)号：JP2000294086A
公开(公告)日：2000-10-20
申请号：JP9778299
申请日：1999-04-05
申请人： TOSHIBA F A SYSTEM ENG , TOSHIBA CORP
发明人： TOMOMITSU KOICHI , NITTA YOSHIMI , NIWA YOSHIMITSU , HONMA MITSUTAKA , SOMEI HIROMICHI
IPC分类号： H01H33/66
摘要： PROBLEM TO BE SOLVED: To provide a stable and good cut-off performance with a simple electrode structure, by contactably/separatably facing a fixed electrode to a movable electrode in a vacuum container, and providing a slit only in the lower surface of a bottom flat plate of a cup electrode. SOLUTION: A cup electrode 10 of a vacuum valve is formed in a structure where slits 4 provided in a cylindrical portion 2 and a bottom flat plate 3 for an arc causes a magnetic field to occur orthogonally to the arc, Lorenz force acting to self current flowing on the arc with this magnetic field drives the arc occurring between contacts during current cutoff. At this time, the magnetic field orthogonally to the arc that occurs in facing cup electrodes 10 causes the arc to start rotating on contacts. In this case, because no slit 4 exists in the upper surface 6 of the bottom flat plate of the cup electrode, generated magnetic field is reduced. While, because the slit 4 exists in the lower surface 7 of the bottom flat plate of the cup electrode, the lower surface 7 serves as a part of a coil for generating magnetic field to increase a driving force of the arc.

3. 发明专利

JP2004108247A Fan tunnel of blower 有权
公开(公告)号：JP2004108247A
公开(公告)日：2004-04-08
申请号：JP2002271859
申请日：2002-09-18
申请人： Toshiba Corp , 株式会社東芝
发明人： NODA SHINICHI , MIZUNO SUEYOSHI , NITTA YOSHIMI , KINOSHITA TSUTOMU
IPC分类号： F04D29/42
摘要： PROBLEM TO BE SOLVED: To provide a fan tunnel of a fan for reducing the noise level by reducing the spatial resonance sound without expanding the noise of a noise source or without relying on a sound absorbing material of a muffler, or without using a fan tunnel of a double structure and for preventing the draft characteristic from being impaired.
SOLUTION: In a fan tunnel of a fan with a plurality of blades rotating in the fan tunnel, air is sucked from a center inlet of the fan tunnel, and air is guided by a guide cylinder of the fan tunnel and discharged from an outer outlet. A flat surface is provided on the inner side of the fan tunnel in a range of 0.75 ≤ L ≤ 0.95. By providing the flat surface on the inner side of the fan tunnel, dominant frequencies can be distributed and the noise is effectively reduced.
COPYRIGHT: (C)2004,JPO

4. 发明专利

JP2000164083A VACUUM VALVE 失效
公开(公告)号：JP2000164083A
公开(公告)日：2000-06-16
申请号：JP33711098
申请日：1998-11-27
申请人： TOSHIBA CORP
发明人： NITTA YOSHIMI , NIWA YOSHIMITSU , SOMEI HIROMICHI , HONMA MITSUTAKA
IPC分类号： H01H33/66 , H01H1/06
摘要： PROBLEM TO BE SOLVED: To provide a vacuum valve exerting excellent shutoff performance free of local concentration of arcs generated on a ring-shaped contact and allowing arcs to remain inside the electrodes to result in extinction when the arcs are rotated on the runner face of the ring-shaped contact by the magnetic field directed at a right angle. SOLUTION: On the inside of a vacuum vessel, a stationary electrode and a movable electrode are installed opposingly capable of contacting and separating with/from each other, each 2 being composed of a cylindrical portion 22 and a bottom surface 23, and a slit 4 is formed in at least one of the cylindrical portion 22 and bottom surface 23, and a ring-shaped contact 1 is fixed to the cylindrical portion 22 so that an intended vacuum valve is accomplished, wherein the condition (1/4)D1

5. 发明专利

JP2003123600A VACUUM VALVE 审中-公开
公开(公告)号：JP2003123600A
公开(公告)日：2003-04-25
申请号：JP2001318887
申请日：2001-10-17
申请人： TOSHIBA CORP
发明人： NITTA YOSHIMI , NIWA YOSHIMITSU , SASAGE KOSUKE
IPC分类号： H01H33/66 , H01H33/18
摘要： PROBLEM TO BE SOLVED: To provide a vacuum valve capable of stably providing the disconnecting performance with a simple electrode structure. SOLUTION: A pair of electrodes 15 are mounted inside of a vacuum container in a state of being abutted on and separated from each other, and comprise contacts 1 opposite to each other, and recessed cup-type electrodes 2 respectively adhered to a rear face of the contact 1, and formed by a cylindrical part having plural slits 4 and a bottom flat part. An electrode shaft 5 is fixed to the bottom flat part of the cup-type electrode 2. A cylindrical reinforcement member 6 coaxial inserted into the electrode shaft 5 is joined to the bottom flat part of the cup-type electrode 2 and the electrode shaft 5 to prevent the crushing of the slits 4 by the impact in opening and closing.

6. 发明专利

JP2002304937A VACUUM VALVE 失效
公开(公告)号：JP2002304937A
公开(公告)日：2002-10-18
申请号：JP2001106566
申请日：2001-04-05
申请人： TOSHIBA CORP
发明人： YOKOKURA KUNIO , NITTA YOSHIMI , NIWA YOSHIMITSU , SASAGE KOSUKE
IPC分类号： H01H33/66 , H01H33/18
摘要： PROBLEM TO BE SOLVED: To break high current even in a high voltage circuit by utilizing permanent magnets and appropriately rotating an arc in the peripheral direction of a contact to prevent the accumulation of the arc in the specific portion. SOLUTION: Permanent magnets 21a, 21b are arranged on the back side of a fixed side contact, 19 so as to locate a fixed side power supply shaft 15 between them, and permanent magnets 22a, 22b are arranged on the back side of a moving side contact 20, so as to locate a moving side power supply shaft 16 between them. Magnetic poles of the permanent magnets 21a, 21b, 22a, 22b are arranged so as to form N poles on the outer circumferential side and S poles on the center side, for example, so that the outside in the diameter direction of the fixed side contact 19 or the moving side contact 20 coincides with the center part side, and a magnetic flux along the diameter direction is generated between the contacts.

7. 发明专利

JP2000208009A VACUUM VALVE 失效
公开(公告)号：JP2000208009A
公开(公告)日：2000-07-28
申请号：JP544499
申请日：1999-01-12
申请人： TOSHIBA CORP
发明人： YOKOKURA KUNIO , NIWA YOSHIMITSU , FUNABASHI TAKUMI , NITTA YOSHIMI , HONMA MITSUTAKA , SOMEI HIROMICHI
IPC分类号： H01H33/66 , H01H1/06
摘要： PROBLEM TO BE SOLVED: To miniaturize electrodes and a vacuum valve by providing a first electrode having a slit with its axis inclined to a bottom part surface and a second electrode having a slit with its axis inclined at a angle decreased an angle of the slit of the first electrode from nearly 180 degrees to the bottom part surface on an internally cylindrical body so as to oppose to each other in a vacuum container. SOLUTION: An arc current generated between contacts 312 opposed to each other is synthesized by a current that flows along a slit 316 and a current that flows along a slit 2, and electromagnetic force acts on an arc by a magnetic field generated by each current in a vertical direction to an arc column. Drive force by the current which flows along the slit 2 acts on the arc when the arc approaches a central side between the contacts 312, and drive force by the current which flows along the slit 316 acts on the arc when the arc approaches the outside of the contacts 312. Therefore, the drive force of the arc can be obtained to suppress localized heating of the arc, and cutoff performance to a heavy-current region can be obtained and electrodes are miniaturized.

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