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1. 发明专利

JPH02216091A INTERNAL PUMP 失效
公开(公告)号：JPH02216091A
公开(公告)日：1990-08-28
申请号：JP3490189
申请日：1989-02-16
申请人： TOSHIBA CORP
发明人： OMIDA HIDEO
IPC分类号： G21C15/243 , F04D7/08 , F04D29/10
摘要： PURPOSE:To intend shortening of a required time for disassembling and reassembling of an internal pump by uniting a seal mechanism and stretch tube nuts and by performing an attaching and detaching work by using a single handling tool. CONSTITUTION:A seal mechanism 15 and a stretch tube nut 14 are united through a thrust bearing 22 placed inbetween, and a ring pipe 29 is positioned so that an interval between nail tips 28a and 28b of a handling tool 28 may be the same interval between groove parts 26 and 27. Then, the handling tool 28 is inserted from a downmost opening of a motor casing 10 and is made to be engaged to corresponding groove parts 26 and 27 by protruding the nail tips 28a and 28b. After that, when the ring pipe 29 is rotated, the nut 14 is separated from the stretch tube 13. Meanwhile, by just reverse procedures, the stretch tube nut 14 and the seal mechanism can be attached at the same time.

2. 发明专利

JPH03158791A INTERNAL PUMP 失效
公开(公告)号：JPH03158791A
公开(公告)日：1991-07-08
申请号：JP29743289
申请日：1989-11-17
申请人： TOSHIBA CORP
发明人： USU MASAJI , OMIDA HIDEO , TOGASAWA YUTAKA , SAITO NOBORU , TAKAHASHI HIDEAKI , YAMAMOTO TETSUZO , ENDO TAKIO
IPC分类号： G21C15/243 , F04D7/08
摘要： PURPOSE:To decrease components which has possibility of becoming loose and to shorten the attachment and detachment time by fitting a diffuser directly to a boss part in a nuclear reactor pressure vessel without using any stretch tube. CONSTITUTION:Plural boss parts 2 penetrate the bottom part of the nuclear reactor pressure vessel 1 at equal intervals in the circumferential direction. The casing 5 of the motor part 4 of the internal pump 3 is fixed to each boss part 2. The lower end outside of the sleeve 14 of the pump 3 and the upper end outside of the boss part 2 of the vessel 1 have cuts 23 and 24 as welding margins over the entire circumference and those parts are welded 25 to fit the diffuser directly to the vessel 1. Consequently, no stretch tube is used for the fixation of the diffuser, so any dedicated jig, etc., is not required to reduce the possibility of loose parts, thereby shortening the attachment and detachment time.

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