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2. 发明专利

JPS62283262A VALVE 失效
公开(公告)号：JPS62283262A
公开(公告)日：1987-12-09
申请号：JP12677786
申请日：1986-05-31
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KAMIKOBAYASHI NOBORU , MIZUNO SADAO
IPC分类号： F16K49/00 , F16K1/00
摘要： PURPOSE:To enable a valve cage flange and a valve cover to be protected from a change of temperature, by arranging a heat shielding plate in the opening upper end of a fluid outlet part and forming a sodium layer in a large thickness. CONSTITUTION:A heat shielding plate 9a protects a valve cage flange 1a and a valve cover 4 of large heat capacity from a thermal influence of internal fluid 12, and the heat shielding plate 9a, which is positioned in the opening upper end of a valve cage fluid outlet part 11, is integrally mounted with a bellows protecting cover 9. Consequently, a sodium layer 10, surrounded by the valve cover 4 and the heat shielding plate 9a, can be formed to a large thickness. Accordingly, the valve cage flange 1a and the valve cover 4 of large heat capacity can be further more effectively protected from a change of temperature of the internal fluid 12.

5. 发明专利

JPS5671798A HEAT EXCHANGER 失效
公开(公告)号：JPS5671798A
公开(公告)日：1981-06-15
申请号：JP14818379
申请日：1979-11-14
申请人： HITACHI LTD
发明人： KAMIKOBAYASHI NOBORU , NAKAGAWA YUKIO , SUMIKAWA MASASHIZU
IPC分类号： F28F9/02 , F28D7/00 , F28D7/16
摘要： PURPOSE:To reduce and uniform the stresses to the joints between the ligament and the rim and between the rim and the shell of the tube plate of a heat exchanger used in a nuclear plant and the like in which a high-temperature thermal medium is treated. CONSTITUTION:Between a ligament 12 and a rim 13, a dummy ligament 15 as a buffer zone is provided. The pitch p and diameter d of the dummy holes are selectively changed according to the ligament 12 to which heat exchanger tubes are welded, in order to make rigidity large or small so that the ligament efficiency and width optimum for the tube plate design conditions can be determined. The dummy holes are provided with caps 14 welded to a tube plate 1 at the boundary between the primary and secondary fluids 9 and 10. This permits the stresses to the joints between the ligament 12 and the rim 13 and between the rim 13 and a shell 4 to be reduced and uniformed.

6. 发明专利

JPS5649894A THERMAL EXPANSION ABSORBER 失效
公开(公告)号：JPS5649894A
公开(公告)日：1981-05-06
申请号：JP12382379
申请日：1979-09-28
申请人： HITACHI LTD
发明人： KAMIKOBAYASHI NOBORU , NAKAGAWA YUKIO
IPC分类号： F22B1/06 , F16L51/02 , F28F9/00 , G21C13/00 , G21D1/00
摘要： PURPOSE:To improve the strength and to facilitate the manufacture, by connecting two members with a step therebetween in a longitudinal direction through bellows having S-shape in cross section thereof. CONSTITUTION:There is a step H between a flange 6 at an upper portion of a drum of a heat exchanger and a tube plate 7, a selected surface of the flange 6 has an intermediate member 16 welded at 18 thereto, a selected surface of the tube plate 7 has an intermediate member 17 welded at 19 thereto and the bellows 20 are welded to the members 16, 17. The thickness of connecting ends 16', 17' of the members 16, 17 is equal to a thickness (t) of the bellows 20. The bellows 20 are formed of a thin steel plate with the thickness (t), and have the first and second arcs 21, 22 with their openings directed oppositely to form an S-shaped cross section thereof. Both the arcs 21, 22 have the same radius R1 (R2). Thus, stress to be induced radially at the weld zone of the attached ends of the bellows can be reduced and therefore this is quite advantageous in view of the strength.

7. 发明专利

JPS54138944A O RING GROOVE CONSTRUCTION 失效
公开(公告)号：JPS54138944A
公开(公告)日：1979-10-27
申请号：JP4533878
申请日：1978-04-19
申请人： HITACHI LTD
发明人： KAMIKOBAYASHI NOBORU , SUGAYA HIDEO
IPC分类号： F16J15/10 , F16J15/06
摘要： PURPOSE:To prevent fluid from staying in an O ring groove by constituting an O ring groove constructon such that fluid which have entered the O ring groove is wholly collected into a fluid collector groove stepped below a seal surfce and is exhausted out of the fluid collector groove. CONSTITUTION:A collector groove for collecting fluid 3 therein is provided on the bottom of an O ring groove which does not serve as a seal surface. Fluid 3 which has entered the O ring groove through a gap between opposing surfces of flanges 2 is sealed between the bottom surface of the groove and the seal surface of the flange 2 by an O ring 1 so that it is after all flowed forcibly into the collector groove 4 formed along a corner of the groove. Since the inside of the collector groove forms a pressure boundary, pressure is constantly applied thereto so that fluid 3 flowed into the collector groove 4 is exhausted from the groove 4 through an exhaust slot 5 communicated to the groove 4. The exhaust slot 5 is bored in a suitable gradient from the fluid collector groove 4 towards the inside or the outside of the machine.

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