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1. 发明专利

JPH0483810A SLIDING MEMBER 失效
公开(公告)号：JPH0483810A
公开(公告)日：1992-03-17
申请号：JP19492990
申请日：1990-07-25
申请人： HITACHI LTD
发明人： YOKOTA NORIKATSU , SATO YOSHIHIKO , NEMOTO KIYOMITSU , OZAWA KAZUMASA
IPC分类号： B22F7/04 , B22F5/00 , C23C30/00
摘要： PURPOSE:To improve wear resistance of a sliding member by setting porous raw material on surface of the sliding member and utilizing lubricating effect possessed in liquid. CONSTITUTION:On the surface of sliding member, the porous raw material is set. This raw material is set as multi-layer so that the porosity becomes low toward the member from the surface. On the surface of raw material, used liquid enters the pores. At the time of bringing the member into contact with the other member, the liquid entering in the pores is surrounded on the contact surfaces of the both, and by this method, the lubricating effect is acted, and as direct contact with both members can be prevented, the wear resistance can be improved. Further, by making the porosity low according to coming to the surface of member, stickness between the member and the porous raw material is made satisfactory and detachment of the raw material and the development of crack can be prevented.

2. 发明专利

JPH10319172A METHOD FOR AND DEVICE OF DEFECT MENDING OF STRUCTURE CONTACTING REDUCING ATMOSPHERE 失效
公开(公告)号：JPH10319172A
公开(公告)日：1998-12-04
申请号：JP12527097
申请日：1997-05-15
申请人： HITACHI LTD
发明人： ABE HIDEAKI , YAMAGATA YASUO , OZAWA KAZUMASA
IPC分类号： G21C19/02 , B23K31/00
摘要： PROBLEM TO BE SOLVED: To efficiently mend the defects generated on the surface of structure contacting such reducing atmosphere as sodium. SOLUTION: By using a repairing device 1 wherein a giving means (heating device 5) of compressive stress against a structure (reactor vessel 2) contacting reducing atmosphere (sodium 3) is arranged in 4 directions with angle intervals of 90 degrees, and giving compressive stress 7 to multisite crack type defects (microcrack 9) generated on the surface of the reactor vessel 2 contacting sodium 3 in different direction from each other in the longitudinal direction of the microcrack 9 and rectangular direction in the surface of reactor vessel 2, the microcrack 9 generated in the direction different from each other is simultaneously pressed and erased.

3. 发明专利

JPS6383692A HEAT PIPE TYPE REACTOR 失效
公开(公告)号：JPS6383692A
公开(公告)日：1988-04-14
申请号：JP22815586
申请日：1986-09-29
申请人： HITACHI LTD
发明人： SHIMOYASHIKI SHIGEHIRO , YAMAMOTO HAJIME , SUMIDA ISAO , HIKICHI TAKAYOSHI , NEMOTO KIYOMITSU , OZAWA KAZUMASA , TSUDA KATSU
IPC分类号： G21C15/14

4. 发明专利

JPH09196582A PIPE WITH PROTRUSION 失效
公开(公告)号：JPH09196582A
公开(公告)日：1997-07-31
申请号：JP710496
申请日：1996-01-19
申请人： HITACHI LTD
发明人： YAMAGATA YASUO , YOKOTA NORIKATSU , SHIMOYASHIKI SHIGEHIRO , OZAWA KAZUMASA
IPC分类号： F28F1/16 , F28F1/36
摘要： PROBLEM TO BE SOLVED: To enable preventing of wear-out breakage because of contact with a support metal while improving heat transfer performance by forming a plurality of protrusions made slender and linear or spiral with a circular or semi-circular section along the length of the external surface of a pipe. SOLUTION: Four linear protrusions 2 are formed at an interval of 90 deg. in the circumferential direction on the external surface along the length of a heat exchanger tube 1 and heat transfer surfaces 3 sandwiched between the protrusions 2 are formed. The linear protrusions 2 are made semicircular and the height of the protrusion 2 is determined by a relationship with the total intensity of the heat exchanger tube 1 considering its role of reinforcing the strength of the heat exchanger tube 1. The existence of the protrusion 2 on the surface of the heat exchanger tube 1 keeps a heat transfer surface 3 from directly contacting a support metal and causing wearing thereof thereby allowing reduction in the thickness of the heat transfer surface 3. This achieves higher heat transfer performance and can prevent wear-out breakage under contact with the support metal.

5. 发明专利

JPH04291129A DEVICE FOR DETECTING CAVITATION OF ELECTROMAGNETIC PUMP 失效
公开(公告)号：JPH04291129A
公开(公告)日：1992-10-15
申请号：JP5632991
申请日：1991-03-20
申请人： HITACHI LTD
发明人： OZAWA KAZUMASA , YOSHIOKA SENJI , YOKOTA NORIKATSU , SATO YOSHIHIKO
IPC分类号： G01M99/00 , G21C17/003 , H02K44/06
摘要： PURPOSE:To quickly and accurately detect the cavitation of an electromagnetic pump used for fast bleeder reactors, etc. CONSTITUTION:By providing an electrode 10 so that the electrode 10 can be brought into contact with a working fluid 5 through the duct 8 of an electromagnetic pump and connecting a high-frequency signal source 11 to the electrode 10 so that most of a high-frequency current can be made to flow near the interface between the fluid 5 and duct 8, the generation and collapse of a cavitation are detected from changes in electrical admittance. Since the electromagnetic pump can be operated within the extent within which no cavitation is generated by accurately and quickly detecting a generated and collapsing cavitation, the damage to the duct by cavitations can be prevented and the service life of the material used for the duct can be prolonged.

6. 发明专利

JPH11221681A PRESSURE WELDING OF MICRODEFECT IN REDUCING ATMOSPHERE 失效
公开(公告)号：JPH11221681A
公开(公告)日：1999-08-17
申请号：JP2175298
申请日：1998-02-03
申请人： HITACHI LTD
发明人： ABE HIDEAKI , YAMAGATA YASUO , OZAWA KAZUMASA
IPC分类号： B23K20/00
摘要： PROBLEM TO BE SOLVED: To make it possible to safely repair defective parts at a low cost in a short period of time by acting the compressive stresses of the specific constant from a perpendicular direction on the defective surface within a space disposed in an atmosphere having a reducing property to join materials, thereby repairing the defective parts. SOLUTION: A repair device 1 is inserted into the sodium 3 of a furnace vessel 2. While the sodium 3 in the repair device 1 is isolated by blowing an inert shielding gas, such as gaseous argon, into the sodium 3 in the repair device 1, the repair device 1 is moved. The front end of the repair device 1 is brought into tight contact with the inside surface of the furnace vessel 2 and a space is formed by the casing 4 of the repair device 1. The circumference of the microdefects 8 generated on the inside surface of the furnace vessel 2 is heated by a heater 5 from the six directions perpendicular to the defective surface. The heated part thermally expands and the central part of the microdefects 8 shrinks. The compressive stresses 6 act from the six directions perpendicular to the microdefects 8, by which the microdefects 8 are press welded and repaired.

7. 发明专利

JPH02223696A STRUCTURE FOR PART CONTACT PORTION 失效
公开(公告)号：JPH02223696A
公开(公告)日：1990-09-06
申请号：JP30785588
申请日：1988-12-07
申请人： HITACHI LTD , BABCOCK HITACHI KK
发明人： SATO YOSHIHIKO , YAMAGATA YASUO , OZAWA KAZUMASA
IPC分类号： G21D1/00 , C22B26/10 , F04D29/02 , F04D29/20 , F16D1/06 , F28F9/26
摘要： PURPOSE:To improve wear resistance of a portion where parts make contact with each other by a method wherein a contact surface between parts making contact with each other in sodium is covered with a surface curing material, e.g. ceramics containing chrome carbide. CONSTITUTION:At a joint between a heat transfer pipe 5 and a tube plate 4 of an intermediate heat exchanger, ceramics 7 containing Cr carbide is applied on the whole periphery of the outer wall of a heat transfer pipe 5 making contact with the through-hole of a tubesheet 4 throughout length approximately equal to the thickness of the tubesheet 4. A surface curing material, e.g. ceramics containing Cr carbide, has high wear resistance and is favorable in suitability in terms of corrosion resistance to Na, and serves to prevent the occurrence of fusing during contact of metallic parts with each other. This constitution enables reduction of corrosion occurring to a gap produced resulting from contact of the constituting parts of a device, used in Na environment, with each other, fusing of parts to each other, and the damage of a part due to wear occasioned by a non-steady slide action.

8. 发明专利

JPH11304765A VOID DETECTION APPARATUS 失效
公开(公告)号：JPH11304765A
公开(公告)日：1999-11-05
申请号：JP11302498
申请日：1998-04-23
申请人： HITACHI LTD
发明人： IWASHIGE KENGO , HIRANUMA TAKESHI , GOTO TADASHI , OZAWA KAZUMASA
IPC分类号： G01N27/74 , G21C17/02
摘要： PROBLEM TO BE SOLVED: To shut noises from outside, reduce influences of noises even when an aperture of a piping increases and detect air bubbles in a conductive fluid, by surrounding a magnetic detection apparatus arranged in the outer periphery of the piping with a magnetism-shielding structure comprising a ferromagnetic core and a layer material. SOLUTION: A magnetic excitation apparatus is set which has two E-shaped cores 10 arranged in the outer periphery of a piping 2 where a fluid 1 is to be introduced and via an orthogonal face to a flow direction of the fluid 1, and an excitation coil 3 surrounding the cores 10. Detection coils 4, 5 are arranged not to overlap with the excitation coil 3, which are surrounded by the E-shaped cores 10. A unit of the coils 4, 5 are set in pairs in the flow direction of the piping and a plurality of the units are disposed in a circumferential direction of the piping 2. A sine wave of several tens to several thousands Hz of a constant current is supplied by a constant current type a.c. power source device to the coil 3. A magnetic flux generated at this time is introduced into the cores 10 to generate a magnetic flux in the piping 2. A magnetic flux change in the outer periphery of the piping 2 because of the presence of air bubbles 9 is measured. The magnetic flux is outputted and detected as an induced electromotive force of the detection coils 4, 5.

9. 发明专利

JPH11173489A PRESSURE-CONTACT IN REDUCING ATMOSPHERE 失效
公开(公告)号：JPH11173489A
公开(公告)日：1999-06-29
申请号：JP34103197
申请日：1997-12-11
申请人： HITACHI LTD
发明人： YAMAGATA YASUO , ABE HIDEAKI , OZAWA KAZUMASA
IPC分类号： F16L57/00
摘要： PROBLEM TO BE SOLVED: To repair a defect safely in a short time by generating a difference in thermal expansion between a pipe and a support structural member provided in the longitudinal direction of outer periphery of the pipe in a condition in which defects of a piping material of which inside is in contact with reducing atmosphere and a material are in contact with the atmosphere and letting compression stress act on a defective face to join them. SOLUTION: When a pipe 1 in contact with sodium 5 is repaired, a support structural material 2 which has a smaller coefficient of thermal expansion than that of the pipe 1 and is divided into two parts is provided in an outer peripheral surface part of the pipe 1, and flanges 3 at both ends thereof are closely joined by spot-welding on an outer surface of the pipe 1. When both materials are heated at substantially same temperature by a heating device 7, the elongation of the pipe 1 in the longitudinal direction due to thermal expansion is blocked because thermal expansion of the support structural material 2 is small, and a compression stress 6 acts on a defective face of a defect 4 occurred on an inner surface of the pipe 1. Consequently, an amount of opening of the defective part 4 is reduced gradually, the defective part 4 is repaired, and oxide films on the surfaces of the materials are removed due to the reduction property of sodium 5, and clean surfaces of the materials are obtained.

10. 发明专利

JPH06168A METHOD AND DEVICE FOR MEASURING ELECTRIC IMPEDANCE DISTRIBUTION 失效
公开(公告)号：JPH06168A
公开(公告)日：1994-01-11
申请号：JP16281692
申请日：1992-06-22
申请人： HITACHI LTD
发明人： YOSHIOKA SENJI , OZAWA KAZUMASA , YOKOTA NORIKATSU , SUZUKI HIROAKI
IPC分类号： A61B5/05
摘要： PURPOSE:To enhance the accuracy for a reconstitution image by collecting at a high speed potential distribution data used for an electric impedance CT method. CONSTITUTION:In the periphery of a measuring object 5, many electrodes 4a-4h are arranged, and from a multi-signal simultaneous supply device 1, electric signals of each different frequency are applied simultaneously to each electrode. A multi-signal simultaneous measuring device 2 measures simultaneously the peripheral potential of the measuring object 5, and a tomographic image reconstituting device 3 executes a frequency analysis of the measured potential, and derives a measured value of a potential distribution in the periphery of the measuring object 5 to each frequency. Subsequently, a tomographic image of an electric impedance distribution for showing an internal state of the measuring object 5 is reconstituted by a numerical calculation.

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