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71. 发明专利

JP2565438B2 失效
公开(公告)号：JP2565438B2
公开(公告)日：1996-12-18
申请号：JP26878091
申请日：1991-09-20
申请人： HITACHI LTD
发明人： MATSUSHITA OSAMI , TAKAGI YUKISHI , YONEYAMA MITSUHO , SUGAYA TOYOMI
IPC分类号： F16C32/04

72. 发明专利

JPH06288397A NOISE REDUCING DEVICE FOR CENTRIFUGAL COMPRESSOR 失效
公开(公告)号：JPH06288397A
公开(公告)日：1994-10-11
申请号：JP8173993
申请日：1993-04-08
申请人： HITACHI LTD
发明人： YOSHIUMI HIROTO , MATSUSHITA OSAMI
IPC分类号： F04D29/44 , F04D29/66
摘要： PURPOSE:To suppress the generation of a standing wave while keeping the function of a centrifugal compressor, and reduce the generation of vibration or noise by setting a resonance type silencer having a section in the part of a node in the standing wave generated in a diffuser. CONSTITUTION:When a centrifugal compressor is operated, a standing wave 2 by a columnar resonance having the part enclosed by a diffuser vane 1 and a diffuser wall vertical thereto as a resonance tube is internally generated in a diffuser. The noise generated by the standing wave 2 is most influenced by those generated by the sound wave having a half wavelength substantially equal to the diffuser length. Thus, a resonance type silencer 3 having a section is set in the part of a node in the standing wave 2. Namely, the resonance type silencer 3 having a substantially middle radius between the inlet radius and outlet radius of the diffuser vane 1 having a rotating shaft as the center and a circular inlet hole is arranged in the diffuser vane 1. The generation of the standing wave 2 is thus suppressed to reduce the generation of vibration or noise.

73. 发明专利

JPH06147191A MAGNETIC BEARING LOADED CENTRIFUGAL COMPRESSOR AND CENTRIFUGAL FLUID MACHINE DEVICE 失效
公开(公告)号：JPH06147191A
公开(公告)日：1994-05-27
申请号：JP30566492
申请日：1992-11-16
申请人： HITACHI LTD
发明人： HIROSHIMA MINORU , FUKUSHIMA YASUO , MATSUSHITA OSAMI , YONEYAMA MITSUO , SAKANASHI TAKAFUMI , TAKAHASHI NAOHIKO
IPC分类号： F04D29/056 , F04D29/04 , F04D29/05 , F04D29/058
摘要： PURPOSE:To improve the rotor control characteristic and the control accuracy of a magnetic bearing loaded centrifugal compressor. CONSTITUTION:A thrust sensor 24 is installed between a radial magnetic bearing 21a and a thrust magnetic bearing 22a, and mechanical dampers 17a, 17b are installed on both side shaft end areas of a rotor 11. Housings 7a-7d are separately constructed to be individually detached, Thus, it is possible to produce the effects of increasing the rotor natural frequency, improving the detecting sensitivity of a sensor, improving the damping force of a mechanical damper, and easily adjusting the capacity of a mechanical damper.

74. 发明专利

JPH05126152A LOW TEMPERATURE COOLING DEVICE 失效
公开(公告)号：JPH05126152A
公开(公告)日：1993-05-21
申请号：JP28972391
申请日：1991-11-06
申请人： NAT SPACE DEV AGENCY , HITACHI LTD
发明人： SAITOU IKUHIRO , TAKAGI YUKISHI , FUKUDA TAMIO , MATSUSHITA OSAMI , MATSUSHITA TADASHI , FURUKAWA MASAO
IPC分类号： F16C32/04 , F25B9/14
摘要： PURPOSE:To secure a specified stroke and sufficient cooling performance by providing a thrust solenoid bearing which for application of negative attenuation as an auxiliary device of a driving means which reciprocably drives a compressing piston and an expanding member, and executes a cooling cycle through compression and expansion. CONSTITUTION:In a compression part of a low temperature cooling device, for instance, a compressing piston 1 is reciprocably driven by a linear motor 2, and a radial force is controlled vertical a pair of radial linear solenoid bearings 4, 5. Displacement detectors 6, 7 are arranged on at least two positions in directions X and Y per one solenoid bearing, for controlling respective radial linear solenoid bearings 4, 5, so that displacement of the compressing piston 1 is detected. In such a construction, a thrust solenoid bearing 8 is provided on the compressing part. Negative attenuation is applied to the compressing piston 1 in a thrust direction by means of the thrust solenoid bearing 8. Positive attenuation applied from operation fluid is canceled, and a specified stroke is obtained.

75. 发明专利

JPH0419393B2 失效
公开(公告)号：JPH0419393B2
公开(公告)日：1992-03-30
申请号：JP10051084
申请日：1984-05-21
申请人： HITACHI LTD
发明人： YONEYAMA MITSUHO , MATSUSHITA OSAMI , UEDA SHINJIRO , TSUMAKI NOBUO , KANBARA HIDEAKI
IPC分类号： F04B37/08 , F04B37/16 , F04C23/00 , F04D19/04

76. 发明专利

JPH03209018A BEARING DEVICE FOR GENERATOR ROTOR 失效
公开(公告)号：JPH03209018A
公开(公告)日：1991-09-12
申请号：JP359390
申请日：1990-01-12
申请人： HITACHI LTD
发明人： IDA DOSHU , MATSUSHITA OSAMI , YAGI YASUOMI
IPC分类号： F16C23/02 , F16C27/02
摘要： PURPOSE:To eliminate thermal affection, facilitate center aligning of a rotor, and preclude ill influence of the encapsulated liquid by furnishing a counter-drive side bearing with rolling elements between inner cylindrical shaft and outer cylindrical shaft and a mechanism to hold the rolling elements, providing freedom from the motion in the direction of rotational axis, and reserving possibility of force transmission in the radial and circumferential directions. CONSTITUTION:A counter-drive side bearing is equipped with rolling elements 7 between inner cylindrical shaft 1 and outer cylindrical shaft 2 and a mechanism to hold them (groove 11 and hole 13), and thereby possible affection of thermal expansion in the direction of rotational axis is absorbed by a taper formed on the inner ring 10 to provide freedom, while force transmission is allowed in the radial direction. This eliminates receiving affection of thermal expansion, facilitates center aligning of rotor, eliminates risk of torque application between the inner cylindrical shaft 1 and outer cylindrical shaft 2, liberates a sealing mechanism from ill influence, and nullifies detrimental influence of the encapsulated liquid. Thus a rotor with stable operation is achieved.

77. 发明专利

JPH03124242A LINEAR ELECTROMAGNETIC BEARING CONTROLLER 失效
公开(公告)号：JPH03124242A
公开(公告)日：1991-05-27
申请号：JP26003789
申请日：1989-10-06
申请人： HITACHI LTD
发明人： SAITOU IKUHIRO , MATSUSHITA OSAMI , TAKAGI YUKISHI , TAKAHASHI NAOHIKO
IPC分类号： F16C32/04 , F16C39/06 , H02K7/09
摘要： PURPOSE:To suppress radial vibration of a shaft driven linearly in the thrust direction by arranging a selective extracting means in a servo circuit and additionally inputting signals in X and Y directions to servo circuits in respective directions. CONSTITUTION:Displacement signals (x), (y), detected in X and Y directions, are provided to an extraction filter 6 for extracting the driving frequency components of the shaft with a driving frequency signal (f1) as a reference signal, and integer times components xfN, yfN of the driving frequency are extracted from the radial vibration components of the shaft. These driving frequency components xfN, yfN are then multiplied by alpha and additionally inputted to respective servo circuits. This operation causes stabilization of the driving frequency. By such arrangement, controllability for the driving frequency components xfN, yfN of the radial vibration of the shaft is improved, resulting in the reduction of the magnitude of radial vibration of the shaft reciprocating linearly in the thrust direction.

78. 发明专利

JPH02246510A CONTROL CIRCUIT WITH PHASE VARIATION TYPE TRACKING FILTER 失效
公开(公告)号：JPH02246510A
公开(公告)日：1990-10-02
申请号：JP6618989
申请日：1989-03-20
申请人： HITACHI LTD
发明人： TAKAGI MICHIYUKI , MATSUSHITA OSAMI , HIRAI HIROTAKE , HIRAI AKIRA , TAKAHASHI NAOHIKO
IPC分类号： H03H17/08 , H03H17/00
摘要： PURPOSE:To enable phase compensation near a desired frequency without providing any new phase compensating circuit by providing the phase variation type tracking filter which has a phase command input. CONSTITUTION:A displacement signal (x) is inputted to a phase compensator 2. Whose arithmetic result is inputted to a power amplifier 5 to supply a control current to an actuator. When the displacement signal (x) is inputted to the phase variation type tracking filter 4, a signal having a phase advance phi among displacement vibration components is obtained in synchronism with alpha frequency (f). This signal is multiplied by proper magnification a and superposed upon the signal of the phase compensator 2 to vary the characteristics of a control system only in a frequency range matching the frequency command (f). Consequently, the circuit constitution is simplified and the gain of specific frequency and phase characteristics can be adjusted optionally.

79. 发明专利

JPH02246202A MAGNETIC LEVITATION DEVICE 失效
公开(公告)号：JPH02246202A
公开(公告)日：1990-10-02
申请号：JP6621189
申请日：1989-03-20
申请人： HITACHI LTD
发明人： OOTAKE SEIJI , OGATA HISANAO , SAHO NORIHIDE , MIZUMOTO MUNEO , MATSUSHITA OSAMI
IPC分类号： H01F6/00 , B60L13/04 , H01L39/00
摘要： PURPOSE:To shorten the time required for reaching a superconducting state and make the superconducting state easier to maintain by suppressing radiation of heat to a low level and prevent humidity as well as adhesion of dust and then obtain stable magnetic levitation by coating the whole surface of a high temperature superconducting material with a non-magnetic material that is superior in thermal conductivity and hold a low coefficient of radiation. CONSTITUTION:The whole surface of a high temperature superconducting material 1 is treated by coating 2 with a non-magnetic material that is superior in thermal conductivity and hold a low coefficient of radiation and a thermal conductive rod that is superior in thermal conductivity is immersed in a cooling medium in order to lead the said coated superconducting material 1 to a low temperature that is up to a critical temperature. The said material 1 which is cooled through the thermal conductive rod 4 is thus cooled efficiently and the time required for reaching a superconducting state is shortened. Then radiation of heat by the said material 1 is suppressed to a low level to avoid humidity of its material. In this way stable magnetic levitation is achieved by obtaining a uniform magnetic repelling force.

80. 发明专利

JPH02131304A CONTACTLESS LEVITATION CARRIER 失效
公开(公告)号：JPH02131304A
公开(公告)日：1990-05-21
申请号：JP28125188
申请日：1988-11-09
申请人： HITACHI LTD
发明人： SAHO NORIHIDE , OGATA HISANAO , OOTAKE IKUJI , MATSUSHITA OSAMI , MIZUMOTO MUNEO
IPC分类号： B65G54/02 , B60L13/04 , B65G43/00
摘要： PURPOSE:To prevent generation of dust from a guide way when a wafer holder is moved by driving the wafer holder through a linear motor mechanism. CONSTITUTION:Permanent magnets 3 are fixed at lower end sections and left/ right end sections of a wafer holder 2. Diamagnetic bodies 5 are arranged at the positions of a guide way 4 corresponding to the permanent magnets 3, and a pipe 6 for cooling the diamagnetic body 5 to a temperature for exhibiting diamagnetism is arranged in the guide way 4. A magnet 7 is arranged in the center of the guide way, and a transmitter 7a comprising a wafer holder position sensing means and a wafer moving direction indicating means is provided. A photo-electric generating means 8 such as a solar cell, a switching means 9, conductive wires 10 and a supporting rod 11 are arranged at the lower section of the wafer holder 2.

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