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51. 发明专利

JP2000021157A ELECTROSTATIC DISCHARGE BREAKDOWN PROTECTION DEVICE FOR MAGNETIC HEAD AND MAGNETIC STORAGE APPARATUS 失效
公开(公告)号：JP2000021157A
公开(公告)日：2000-01-21
申请号：JP18365898
申请日：1998-06-30
申请人： HITACHI LTD
发明人： KATO YASUHIRO , SUZUKI TOSHIO
IPC分类号： G11B33/14 , G11B5/02
摘要： PROBLEM TO BE SOLVED: To protect a head element from discharge of electrostatic charges by disposing means for ensuring electrical short-circuiting of a terminal section of a recording and reproducing head to be used for connection with an external circuit. SOLUTION: A short-circuiting member 30 is provided at terminals 10 to be used for connection with recording and reproducing channels in a terminal made of an FPC 20. This short-circuiting member 30 is disposed so that its opening is positioned across a terminal section of a head arm, and an end of a support piece 32 is adhered to the lower surface of a head arm support plate 4. Furthermore, a bending process is performed so that a surface of a short-circuiting piece 31 that is to come into contact with the terminals constitutes an outer surface while bent and the peak point 34 in the bending process comes into contact with a slope provided in a connector 10. With such a configuration, it becomes possible to adhere the short-circuiting piece 31 to the terminals 10 with a strong force in a normal condition so as to allow the terminals to be surely short-circuited, and it becomes possible to easily release the terminals from the short-circuited condition when connecting the terminals 10 to the connector.

52. 发明专利

JPH11343808A ROTOR SIDE PASSAGE SHAPE 失效
公开(公告)号：JPH11343808A
公开(公告)日：1999-12-14
申请号：JP15250698
申请日：1998-06-02
申请人： HITACHI LTD
发明人： KISHIBE TADAHARU , KATO YASUHIRO
IPC分类号： F01D11/02
摘要： PROBLEM TO BE SOLVED: To reduce the loss of leakage in a stator blade part by reducing the quantity of leakage in the seal part of a stator blade having a shroud. SOLUTION: The shape of this rotor side passage is formed in such a manner that the front flange 7 of a stator blade shroud 4 is protruded to one of moving blades 1 and 3 located in the front side thereof, i.e., one having a radius larger than the extension line of the rotor side passage surface, the downstream side pressure of the seal part of a stator blade 2 equipped with a shroud is increased by using the dynamic pressure of a main flow, a pressure difference in the stator blade 2 equipped with a shroud is reduced, and the quantity of leakage in the seal part of the stator blade equipped with the shroud is reduced.

53. 发明专利

JPH1113692A AXIAL FLOW COMPRESSOR CASCADE 失效
公开(公告)号：JPH1113692A
公开(公告)日：1999-01-19
申请号：JP16560397
申请日：1997-06-23
申请人： HITACHI LTD
发明人： HAMATAKE HISASHI , KATO YASUHIRO
IPC分类号： F04D29/38
摘要： PROBLEM TO BE SOLVED: To increase the thickness of a blade to ensure reliability on strength at a low cost and to avoid a choke flow by weakening an inter-blade shock wave. SOLUTION: In this cascade, in a range of 5% of a blade height from a moving blade root, a difference between a ratio of a cascade inlet width to the minimum flow passage width 12 of the cascade and a ratio of the minimum flow passage width 12 of the cascade to the inlet flow passage width 11 of the cascade is set to 0.06-0.08. A ratio of a difference between the cascade inlet width 13 and a cascade throat width 14 to the cascade inlet width of the cascade is set to 0.-02-0.04. This constitution suppresses acceleration of a flow on a blade surface on the back side and a blade surface on the belly side and avoids a choke flow by weakening an interblade impact wave.

54. 发明专利

JP2588907B2 失效
公开(公告)号：JP2588907B2
公开(公告)日：1997-03-12
申请号：JP24792587
申请日：1987-10-02
申请人： HITACHI LTD
发明人： SATO NAOKI , KAMO YOSHIHISA , KATO YASUHIRO
IPC分类号： G11B5/09 , G11B20/10

55. 发明专利

JPH06147189A PROPAGATING STALL PREVENTING DEVICE OF COMPRESSOR 失效
公开(公告)号：JPH06147189A
公开(公告)日：1994-05-27
申请号：JP30080392
申请日：1992-11-11
申请人： HITACHI LTD
发明人： ISHII HIROSHI , SASADA TETSUO , KASAHARA MASAYUKI , KATO YASUHIRO , KASHIWABARA YASUNARI
IPC分类号： F04D27/00 , F04D27/02
摘要： PURPOSE:To prevent propagating stall caused at the time of speed-up or speed- down without affecting on the performance of a compressor in a propagating stall preventing device of the compressor. CONSTITUTION:In a compressor including at least an inlet guide blade 6, a rotating moving blade 9 and a stationary blade 7 which are provided in a casing 2, a rotatable straightening blade 5 is disposed upstream of the inlet guide blade 6, an actuator 11 is provided on the straightening blade 5, a sensor 12 for detecting the propagating stall condition in a compressor passage is disposed on the upstream of the straightening blade 5, and a control means 13 is provided for intaking a signal from the sensor 12 and outputting a signal for cancelling the propagating stall condition to the actuator 11.

56. 发明专利

JPH05340385A 失效
公开(公告)号：JPH05340385A
公开(公告)日：1993-12-21
申请号：JP14534092
申请日：1992-06-05
申请人： HITACHI LTD
发明人： ISHII HIROSHI , KASAHARA MASAYUKI , KASHIWABARA YASUNARI , KATO YASUHIRO , SASADA TETSUO
IPC分类号： F04D27/02
摘要： PURPOSE:To improve an unsteady flow field directly to expand a stable action range, and prevent rotating stall of a compressor by changing a flow condition of a compressor flow passage by drive control to a flow fairing blade based on a detection signal of a rotating stall sensor disposed in the compressor flow passage. CONSTITUTION:In a compressor, an inlet guide blade 7, a movable blade 8, a static blade 9, and an outlet guide blade 10 are installed in a casing 11, and a compressor flow passage is formed. In this case, a flow fairing blade 6 is disposed upstream of the inlet guide blade 7, and a rotating stall sensor 1 is disposed upstream thereof. A detection signal of the rotating stall sensor 1 is inputted through an amplifier 2 to a computation device 3, while a computation signal of the computation device 3 is outputted to a motor 5 through a servo amplifier 4. An installation angle of the flow fairing blade 6 is changeably controlled, and a flow condition of the compressor flow passage is regulated to be the optimum. An unsteady flow field is thus directly improved against the rotating stall of the compressor, thereby a stable action range is expanded, with the rotating stall prevented.

57. 发明专利

JPH0586901A GAS TURBINE 失效
公开(公告)号：JPH0586901A
公开(公告)日：1993-04-06
申请号：JP24188391
申请日：1991-09-20
申请人： HITACHI LTD
发明人： SASADA TETSUO , KAWAIKE KAZUHIKO , TORITANI HAJIME , TAKEHARA ISAO , KATO YASUHIRO
IPC分类号： F02C6/06 , F02C7/18
摘要： PURPOSE:To minimize the leakage and enhance the thermal efficiency by installing an air pressure booster in-between an air compressor and a cooling blade and thus minimizing the pressure difference between the pressurized cooling air and the ambient air and recovering leak air in the gas turbine. CONSTITUTION:An air pressure booster 6 is installed in the portion of a compressor outlet 9 between a compressor 1 and a turbine 3. Part of the compressor discharge air is pressurized by rotary power of a wheel shaft 7, and the air is supplied as high-pressure cooling air 10 to a turbine stator blade 4 and a turbine moving blade 5 for their cooling. After cooling the turbine blades 4, 5 part of the cooling air flows into main stream gas from the blades, and part of the same is returned to the compressor outlet portion 9 and flows as combustion air into a combustor. Accordingly, the pressurizing mechanism of cooling air is surrounded by high-pressure compressor discharge air, so that the pressure difference between the pressurized cooling air and the ambient air is a minimum and thus the leakage is a minimum. Consequently, thermal efficiency of a gas turbine can be enhanced.

58. 发明专利

JPH0311105A MOVING BLADE VIBRATION WORKING OUT DEVICE 失效
公开(公告)号：JPH0311105A
公开(公告)日：1991-01-18
申请号：JP14535589
申请日：1989-06-09
申请人： HITACHI LTD
发明人： ISHII HIROSHI , KATO YASUHIRO , NAKAGAWA KOJI , KASHIWABARA YASUNARI
IPC分类号： F01D5/16
摘要： PURPOSE:To make it possible to work out the vibration of a moving blade accurately and high reliably by constituting an arithmetic unit determining the vibration of a moving blade based on electric signals from a picture processing unit and rotation datum signals from a rotation datum detector. CONSTITUTION:Outside a casing 23, a high speed camera 21 is provided to recognize the movements of a moving blade 22 as images. A picture processing unit 26 convert the image information from the camera 21 into electric signals. A magnetic pick-up 25 detects a groove 24, and the detected signals are transmitted to an arithmetic unit 27. The arithmetic unit 27 determines the vibration of the moving blade 22 based on the electric signals from the picture processing unit 26 and the rotation datum signals from the magnetic pick-up 25. This allows to take pictures the movements of the end face of the moving blade 22 clearly and in a short sampling time, and to provide an accurate, high reliable, and practical moving blade vibration working out device without lowering the performance and reliability of a rotary machine.

59. 发明专利

JPH01312787A CONTACT FORCE MEASURING SYSTEM FOR HEAD DISK 失效
公开(公告)号：JPH01312787A
公开(公告)日：1989-12-18
申请号：JP14371288
申请日：1988-06-13
申请人： HITACHI LTD
发明人： HAMAGUCHI TETSUYA , MATSUMOTO MASAAKI , NISHIMURA KOJI , TSUCHIYAMA RYUJI , KATO YASUHIRO
IPC分类号： G01L5/00 , G11B21/21
摘要： PURPOSE:To measure a contact shock between a head and a disk quantitatively during head floating by measuring a shock response waveform at contact and fitting the result or substituting it to a shock response waveform calculated by a dynamic model of the head support system and an external shock given by a proper function. CONSTITUTION:A static capacitance type floating quantity sensor head 4 is used to measure a force in a perpendicular direction (Z direction) to the surface of a disk 5 and a strain gage force sensor 1 is used for the measurement of a force in the tangential direction (X direction) of the disk. The sensor provided at a part of the head support system measures any of displacement/speed/ acceleration/torque of a parallel motion or rotary motion of the part and measures a shock response waveform due to a contact shock. On the other hand, the theoretical shock response waveform is calculated from the head support system dynamic model and a function representing the external shock and the contact shock is obtained quantitatively by fitting the sensor output or substituting the measured value to the function. Thus, the contact shock between the head and disk is measured easily and quantitatively.

60. 发明专利

JPH01211696A DEVICE FOR PREVENTING COMPRESSOR FROM STALLING 失效
公开(公告)号：JPH01211696A
公开(公告)日：1989-08-24
申请号：JP3397888
申请日：1988-02-18
申请人： HITACHI LTD
发明人： ISHII HIROSHI , KASHIWABARA YASUNARI , MATSUURA YUTARO , KATO YASUHIRO , HAGIWARA NORIAKI
IPC分类号： F04D27/00 , F04D27/02
摘要： PURPOSE:To surely prevent a compressor from stalling before hand by inversing a signal code of one of two serge sensors, and by adding both signals so as to control an actuator for a valve for releasing wind. CONSTITUTION:Pressure converters 8a, 8b in a compressor 1 electrically convert pressures from pressure sensors 7a, 8b to output them to filter circuits 9a, 9b. A code inverse circuit 10 inverts a signal code to output a signal. An adding circuit 11 add and integrate signals from the circuit 10 and the filter 9b to output the same to an output judging circuit 12. An actuator 6 works only when a signal is input from the circuit 12 to open a valve for releasing wind 5.

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