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21. 发明专利

JPH05346486A 失效
公开(公告)号：JPH05346486A
公开(公告)日：1993-12-27
申请号：JP15472692
申请日：1992-06-15
申请人： HITACHI LTD
发明人： CHIBA YOSHIAKI , INOUE TOMOAKI , NAKAMURA SHOZO , SHIINA KOJI , UOZUMI HIROTO , ENDO AKIO
IPC分类号： F04D7/08 , G21C15/243
摘要： PURPOSE:To suppress thermal stress generation and thermal expansion by providing vibration prevention part placed on a sleeve with an air path hole and promoting circulation and natural convection of heated air. CONSTITUTION:In the pump nozzle 6 provided on a head plate at the bottom of a reactor pressure vessel, a sleeve 7a of a pump casing 7 is coupled. A vibration prevention part 12 is provided around the sleeve 7a, which contacts the inner surface of bottom end of the pump nozzle 6. The pump nozzle 6 is heated up by reactor water during operation. The heated air in the gap 8 circulates by thermal convection due to the temperature difference between both wall surfaces of the pump nozzle 6 inner surface and sleeve 7a outer surface. It passes through air paths 13a, 13b, 13c and 13d provided in the vibration prevention part 12 and therefore, the heated air in the gap 8 and the exterior air are replaced and thermal convection is promoted. As the both wall surfaces of pump nozzle 6 inner surface and sleeve 7a outer surface are evenly cooled by the circulation of the exterior cool air, ununiformity of temperature distribution is moderated.

22. 发明专利

JPH05141367A SCROLL COMPRESSOR 失效
公开(公告)号：JPH05141367A
公开(公告)日：1993-06-08
申请号：JP30087891
申请日：1991-11-15
申请人： HITACHI LTD
发明人： INOUE TOMOAKI , CHIBA YOSHIAKI
IPC分类号： F04C18/02 , F04C23/00
摘要： PURPOSE:To prevent one-sided collision of a revolving bearing by independently balancing a centrifugal force, exerted on the revolving scroll of a scroll compressor, and a fluid force with each other. CONSTITUTION:Fixed scroll laps 3b and 3c are mounted on the two surfaces of the fixed scroll of a scroll compressor in a state that phases are displaced in a 180 deg. arc from each other and revolving scrolls are arranged vertically in two stages in a manner to combine the revolving scroll therewith. By displacing the phases of the fixed and revolving scrolls, arranged vertically in two stages, by 180 deg. from each other, a fluid force is balanced and one-sided collision of the revolving bearing is prevented from occurring, whereby the speed of the scroll compressor can be increased.

23. 发明专利

JPH0552985A INTERNAL PUMP FOR ATOMIC REACTOR 失效
公开(公告)号：JPH0552985A
公开(公告)日：1993-03-02
申请号：JP21368391
申请日：1991-08-26
申请人： HITACHI LTD
发明人： CHIBA YOSHIAKI , INOUE TOMOAKI , OMORI MOTOTSUGU , NAKAMURA SHOZO , SHIINA KOJI , NAKAHIRA SHIRO , UOZUMI HIROTO
IPC分类号： F04D7/08 , F04D29/04 , F04D29/043 , F04D29/10 , G21C15/243
摘要： PURPOSE:To suppress the instability vibration due to the oscillatory rotation of the pump shaft, increase the seal effect by stabilizing purge water flow and prevent invading of the reactor coolant including crad into the motor part. CONSTITUTION:Around a shaft boss 7, a plurality of axial grooves 11 of which upper end is in the gap 10 between the shaft boss 7 and a diffuser innercylinder 6 and lower end coinsides with the lower end of the shaft boss 7. The hydrofilm pressure vibrating the pump shaft is released, the generation of Tailor eddy is prevented and thus seal effect of the purge water is obtained so that stable pump operation becomes possible.

24. 发明专利

JPH04194786A REACTOR RECIRCULATION PUMP 失效
公开(公告)号：JPH04194786A
公开(公告)日：1992-07-14
申请号：JP32290690
申请日：1990-11-28
申请人： HITACHI LTD
发明人： NAKAMURA SHOZO , SHIINA KOJI , MIZUSHINA YASUO , INOUE TOMOAKI , CHIBA YOSHIAKI , SAGAWA WATARU , TAKEHARA HIDETOSHI , TANAKA MASAAKI
IPC分类号： G21C15/243 , F04D7/08
摘要： PURPOSE:To prevent occurrence of temperature fluctuation due to the flow back of high temperature reactor water and the generation of unsteady thermal stress by forming a shut and a shut cover so that the pressure loss becomes maximum at the outlet of clearance. CONSTITUTION:If a shaft 1 is formed so that the upper gap in the clearance part 11 is smaller than the lower gap and the outer surface of the shaft has an inclination of theta degree to the inner surface of the shaft cover 9, the uppermost end of the clearance part 11, that is, the gap of the outlet of seal purge water A becomes narrowest. By this, the pressure loss at the outlet becomes maximum and the flow of purge water A is limited at the outlet. Therefore, the pressure at each point in the clearance part 11 becomes higher than pressure P0 at the outlet showing positive pressure characteristic and so the flow of the purge water A becomes stable. Thus the backflow of high temperature reactor water B to the clearance part 11 is prevented. As a result, the temperature fluctuation in the clearance part 11 is prevented, the generation of thermal fatigue on the shaft cover 9 surface is prevented and the reliability of the recirculation pump is improved.

25. 发明专利

JPS63254282A GAS GOVERNOR DEVICE 失效
公开(公告)号：JPS63254282A
公开(公告)日：1988-10-20
申请号：JP8713587
申请日：1987-04-10
申请人： HITACHI LTD
发明人： CHIBA YOSHIAKI , INOUE TOMOAKI , WATABIKI MASAYUKI , SONODA SHINJI
IPC分类号： F16K17/30 , F16K31/04
摘要： PURPOSE:To arrange so that interception by a valve at the time of emergency may become sure by arranging a constitution in which the valve is made to operate by introducing the primary side pressure at the time of emergency though ordinarily an inner tube case and the secondary side pressure are connected. CONSTITUTION:A gas governor device is constituted with an outer tube case 1 and an inner tube case 2, and a drive motor 4 is received inside the inner tube case 2, and a valve 9 is fitted on the side opposite to the drive side. Gas flows along a gas flow passage 15 between the outer tube case 1 and the inner tube case 2 in the direction of arrows, and a step motor 4 rotates when the secondary side pressure changes against a setting value, and the valve 9 does the operation of opening/closing by means of a screw mechanism 8, and gas flow quantity is regulated. A solenoid valve 18 is made to operate at the time of emergency and the pressure on the primary side is connected with the inner tube case 2. The spring force of a spring 19 is pre-set smaller than thrust force by the primary pressure, and gas is to be intercepted by means of the valve.

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