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1. 发明专利

JPS627391B2 失效
公开(公告)号：JPS627391B2
公开(公告)日：1987-02-17
申请号：JP8294080
申请日：1980-06-20
申请人： HITACHI LTD
发明人： HISHIDA YASUO , OGIWARA MASASHIGE
IPC分类号： F03B3/02 , F03B3/10

2. 发明专利

JPS61164080A OPERATING METHOD OF VARIABLE-SPEED HYDRAULIC TURBINE GENERATOR 失效
公开(公告)号：JPS61164080A
公开(公告)日：1986-07-24
申请号：JP378985
申请日：1985-01-11
申请人： HITACHI LTD
发明人： HISHIDA YASUO , OGIWARA MASASHIGE
IPC分类号： F03B15/04 , F03B15/00
摘要： PURPOSE:To make stable starting come to fruition, by setting a revolving speed in an induction generator down to the minimum revolving speed in the generator in a head at that point of time after turbine starting, while opening the opening of a turbine's guide vane to the extent of no-load guide vane opening at the said minimum revolving speed mutually and paralleling it in a system for the end. CONSTITUTION:At the time of turbine starting, guide vane opening GVO, which is commensurate to a certain head Hi and equivalent to a minimum revolving speed, is set in advance. And, after turbine starting, first the head Hi is detected, and opening of a guide vane, regulating a water quantity to be fed to a hydraulic turbine, is opened to the extent the said GVO. Next, a revolving speed in an induction generator to be driven by the turbine is controlled to the minimum revolving speed, and it is paralleled in a system in a state that terminal voltage of the induction generator and system voltage are equally synchronized. According to an operating method like this, since the terminal voltage and the system voltage are paralleled in the system at the minimum guide vane opening and the minimum revolving speed, a dead water quantity is minimizable and, what is more, stable starting is realizable.

3. 发明专利

JPS5882077A OPERATION OF WATER TURBINE OR REVERSIBLE PUMP-TURBINE 失效
公开(公告)号：JPS5882077A
公开(公告)日：1983-05-17
申请号：JP17976581
申请日：1981-11-11
申请人： HITACHI LTD
发明人： IKEDA MASAYOSHI , OGIWARA MASASHIGE
IPC分类号： F03B15/04 , F03B11/00
摘要： PURPOSE:To make it possible to prevent the leakage water by a method wherein in case the quantity of leaking water from a main shaft sealing section increases to an excessive degree, compressed air is supplied into a runner chamber so that the level of water in the chamber is lowered. CONSTITUTION:In case where the quantity of the leaking water increases due to the breakage of the water sealing section 1 during the operation of a water turbine or in case where a water level detector 4 detects a rise in the level of water pooled in a pit 3 due to the clogging of drain pipe 2, the water turbine is stopped and the guide vane 5 is closed as a first step. Next, a water level lowering air feed valve 7 directly connected to a compressed air generator 6 is opened to supply the compressed air into the runner chamber so that the level of the water in the chamber is lowered down to the surface A below the runner, to thereby prevent the leakage of the water.

4. 发明专利

JPS5377939A OPERATING METHOD FOR HYDRAULIC MACHINERY 失效
公开(公告)号：JPS5377939A
公开(公告)日：1978-07-10
申请号：JP15341876
申请日：1976-12-22
申请人： HITACHI LTD
发明人： MORIGUCHI KAZUO , OGIWARA MASASHIGE
IPC分类号： F03B15/04 , F03B3/10 , F03B11/00 , F03B15/00
摘要： PURPOSE:To make it possible to prevent the runner from thermal expansion caused by the rise in temperatur during a long operation, by cooling the runner in such a manner that pressured air is adiabatically expanded at around the runner in case of running idle the runner of hydraulic machinery.

5. 发明专利

JPH0248748B2 失效
公开(公告)号：JPH0248748B2
公开(公告)日：1990-10-26
申请号：JP378985
申请日：1985-01-11
申请人： HITACHI LTD
发明人： HISHIDA YASUO , OGIWARA MASASHIGE
IPC分类号： F03B15/04 , F03B15/00

6. 发明专利

JPS6445995A VARIABLE SPEED PUMPING SYSTEM 失效
公开(公告)号：JPS6445995A
公开(公告)日：1989-02-20
申请号：JP20171187
申请日：1987-08-14
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA HISAO , OGIWARA MASASHIGE , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： F04D15/00 , H02P9/00 , H02P9/04
摘要： PURPOSE:To improve the stability in a power system by setting a response speed of each control to a relation where output control > guide vane opening control > speed control, in case of the power system directly connecting a storage pump to a rotary electric motor connected to the power system through a frequency converter. CONSTITUTION:In the case of a power system 1 turning a reversible pump turbine 4 by power generated in a wound-rotor induction motor 2 connecting its primary side to the power system 1 and secondary side to a power converter 3, a comparator 18, which calculates a deviation between the proper rotary speed NOPT from a rotary speed function generator 12 and the actual rotary speed by a rotary speed detector 5, is provided. While providing an adder 19 which obtains the integrated output target signal by adding the above decreased deviation to a power instruction Po, the power converter 3 is controlled being based on an output of the adder 19. While an opening controller 9, which gives an output in accordance with a deviation of the opening target value of a guide vane in the reversible pump turbine 4 from its actual value, is provided. Each control loop sets its response speed to a relation where output control > guide vane opening control > speed control.

7. 发明专利

JPS62150079A FRANCIS TYPE RUNNER 失效
公开(公告)号：JPS62150079A
公开(公告)日：1987-07-04
申请号：JP28923685
申请日：1985-12-24
申请人： HITACHI LTD
发明人： TOSHIMA MASAMI , TANABE SEIICHI , YAMABE MASAHIRO , OGIWARA MASASHIGE
IPC分类号： F03B3/12 , F03B3/02
摘要： PURPOSE:To reduce noise and vibration of a water turbine to aim at enhancing the efficiency and output power thereof, by specifying the relationship among the outer diameter of runner vanes, the inner diameter of a shroud, the rotational speed and flow rate of the water turbine so that the stepped characteristic of the turbine during running thereof is removed. CONSTITUTION:Occurrence of the stepped characteristic of a water turbine is caused by the relationship among the rotational speed and flow rate of the water turbine and the inner diameter of a shroud. It is estimated that the rotational speed of the water turbine at the maximum efficiency of the turbine including the runner in which the outer diameter of runner blades is D, and the inner diameter of a shroud 2 is D2, is N1T, and the flow rate of the water turbine is Q1T. Further, these values are selected so that the relationship among the values satisfies the formula I.

8. 发明专利

JPS56115867A MULTISTAGE HYDRAULIC MACHINE 失效
公开(公告)号：JPS56115867A
公开(公告)日：1981-09-11
申请号：JP1783180
申请日：1980-02-18
申请人： HITACHI LTD
发明人： HISHIDA YASUO , OGIWARA MASASHIGE
IPC分类号： F03B3/10 , F03B3/12
摘要： PURPOSE:To improve reliability in coupling of runners and a main shaft and to raise the efficiency of operation in assembling and disassembling the runners and the main shaft, by forming the runners integrally with their shaft couplings, and fixing these shaft couplings to the main shaft. CONSTITUTION:Runners 2, 3 are formed integrally with their shaft couplings 2A, 3A which are respectively formed with holes for receiving bolts 10, 11, and these shaft cuplings 2A, 3A are fixed to a main shaft 1. A lower shaft 14 and the runner 3 are coupled together by bolts 11, and an intermediate shaft 12 and the runner 3 are coupled together by bolts (not shown) at a flange portion 13 formed at the lower end of the shaft 12. Further, the shaft 12 and the runner 2 are coupled together by bolts 10, and the main shaft 1 and the runner 2 are coupled together by bolts (not shown) at a flange portion 9 formed at the lower end of the main shaft 1. With such an arrangement, it is enabled to raise the efficiency of operation in assembling and disassembling the runners 2, 3 to and from the main shaft 1 and to facilitate machining and other operation since the shafts 12, 14 are designed to be detachable.

9. 发明专利

JPS56107969A MULTISTAGE HYDRAULIC MACHINERY 失效
公开(公告)号：JPS56107969A
公开(公告)日：1981-08-27
申请号：JP1007280
申请日：1980-02-01
申请人： HITACHI LTD
发明人： HISHIDA YASUO , OGIWARA MASASHIGE
IPC分类号： F03B3/10 , F03B11/04
摘要： PURPOSE:To reduce the thrust of a hydaulic shaft by sending pressurized oil to the terminal face of a main shaft on the side of the generation of hydraulic thrust for generating a reverse thrust. CONSTITUTION:A pressure-oil enclosing mechanism 8, a pressure-oil introducing pipeline 9, and a main shaft lower end receiving face 10 are provided at the lower end of a main shaft 1 of a two-stage pump water turbine. A desired amount of oil is leaked from the pressure-oil enclosing mechanism 8 to be used for the lubrication of a lower main bearing 3. In this construction, pressure oil is sent to the terminal face of the main shaft on the side of the generation of hydraulic thrust, and a reverse thrust is generated for reducing the thrust of a hydraulic shaft.

10. 发明专利

JPS5517604A METHOD OF AND DEVICE FOR OPERATING HYDRAULIC TURBINE OR PUMP HYDRAULIC TURBINE 失效
公开(公告)号：JPS5517604A
公开(公告)日：1980-02-07
申请号：JP8840178
申请日：1978-07-21
申请人： HITACHI LTD , HITACHI SERVICE ENG
发明人： OGIWARA MASASHIGE , KAWADA MINORU , ASHITA TEIJI
IPC分类号： F03B15/04 , F03B15/00
摘要： PURPOSE:To enable a hydraulic turbine from safely and stably idling by controlling the opening timing of a leakage drain valve to thereby restrict the elevationally varying water level to rise. CONSTITUTION:In a method of operating a hydraulic turbine having the steps of starting the turbine, shutting off the pressure water, supplying compressed air into a runner chamber to lower the water level toward the runner, and exhausting the water retained at the outer periphery of the runner from a leakage water drain tube 10, an inlet valve opening detector 31 for detecting the opening of an inlet valve 15 provided at the water channel side of a casing 14 is installed at the valve 15 to transmit the output therefrom through a timer 32 to a leakage drain valve controller 33. The detector 31 detects the time when the valve 15 is closed to thereby operate the controller 33 after lapse of predetermined time so as to open a leakage drain valve 11. Thus, it can exactly lower the water level in the runner chamber to thereby enhance the safety in the operating state of the turbine.

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