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1. 发明专利

JPH11101630A METHOD AND APPARATUS FOR MEASURING POSITION OF BOUNDARY OF DIFFERENT SUBSTANCES BY ULTRASONIC WAVE 失效
公开(公告)号：JPH11101630A
公开(公告)日：1999-04-13
申请号：JP26324097
申请日：1997-09-29
申请人： HITACHI LTD , HITACHI NUCLEAR ENG
发明人： WATANABE ATSUSHI , NAGASHIMA YOSHIAKI , TAKAHASHI FUMINOBU , SASAKI TSUKASA , NOMURA KEIICHI , KIKUCHI TOSHIICHI
IPC分类号： G01B17/00 , G01N29/00 , G01S7/526 , G01N29/18
摘要： PROBLEM TO BE SOLVED: To provide a boundary position measuring method for measuring the distance to the boundary of different types of substances, from the time taken by propagation of ultrasonic waves reflected from the boundary of different types of substances and the acoustic velocity of ultrasonic waves corrected corresponding to the degree of deterioration of a medium, in the ultrasonic waves propagating in the medium. SOLUTION: The propagation time of longitudinal and transverse ultrasonic waves in a surface-reformed layer 4a is obtained by a part 6 for measuring the time taken to propagate reflected waves received by an ultrasonic sensor 1. The acoustic velocity corrected corresponding to the degree of deterioration is calculated by an acoustic velocity correcting apparatus 7 based on the correlation of the degree of the deterioration of a corrected data recording part 8a and the acoustic velocity ratio. The position of the boundary is calculated by the boundary position calculating apparatus 9, which calculates the boundary position from the corrected acoustic velocity and the propagation time.

2. 发明专利

JPH0694628A EQUIPMENT AND SYSTEM FOR FLAW DETECTION OF DOUBLE TUBE STRUCTURE 失效
公开(公告)号：JPH0694628A
公开(公告)日：1994-04-08
申请号：JP24293192
申请日：1992-09-11
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NOMURA KEIICHI , KOMURO HIDETAKA
IPC分类号： G01B11/30 , G01N21/88 , G01N21/954 , G21C17/003
摘要： PURPOSE:To obtain equipment and a system for flaw detection of a double tube structure which enable the flaw detection of a welded part of an inner tube of the double tube structure through a gap between the inner tube and an outer tube. CONSTITUTION:A rotary ring 7 is rotated by a motor 9 for rotation and a flexible arm 14 equipped with a PT head 15 and an observing head 18 is also rotated in a narrow part 4. The PT head 15 and the observing head 18 move vertically, being driven by a motor 33 for a vertical motion. Thereby the PT head 15 and the observing head 18 are positioned at arbitrary positions. Thereafter a penetrant, a washing liquid, a developer and warm air sent by a pressure supply header 17 are jetted for flaw detection onto the rear side of a welded part from a PT nozzle provided in the PT head 15, and a signal of an image of the rear side of the welded part picked up by a small-sized camera 26 of the observing head 18 is received for observation by an observing device 21 through a camera cable 20.

3. 发明专利

JPH05209737A RADIATION-PENETRATION TESTING APPARATUS FOR DOUBLE-TUBE STRUCTURE 失效
公开(公告)号：JPH05209737A
公开(公告)日：1993-08-20
申请号：JP1681992
申请日：1992-01-31
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NOMURA KEIICHI , KOMURO HIDETAKA
IPC分类号： B23K31/00 , G01B15/04 , G21C17/003
摘要： PURPOSE:To obtain a radiation-penetration testing apparatus, wherein the position of a focal point can be accurately determined at the inner side of an inner tube, and an annular film can be accurately positioned at the gap between an outer tube and the inner tube, when a double-tube structure is inspected using a panoramic X-ray generator. CONSTITUTION:A radiation-source positioning device 50 is constituted of an X-ray-generating-device holding support 7 and a guide member 7A, which determine a position 6 of a focal point of a panoramic X-ray generator on the central axis of an inner tube, and an X-ray-generating-device during mechanism 8, which determines the position 6 of the focal point on the plate formed of the welding center axis. An annular film holder 14 can assembled and disassembled. A roll film 16 is formed in an annular shape at the outside of the inner-tube welding part at the gap between an outer tube and the inner tube through an opening part 4 of accessing. An assembling arm 13 determines the position of the roll film 16 in the axial direction of the tube. An assembling-type supporting ring 12 determines the position in the circumferential direction. A film positioning device 51 is composed of these parts.

4. 发明专利

JPS63154963A CIRCULAR ARRAY PROBE 失效
公开(公告)号：JPS63154963A
公开(公告)日：1988-06-28
申请号：JP30127786
申请日：1986-12-19
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： HIGUCHI SHINICHI , YOSHIDA YOJI , MIURA SHIRO , NOMURA KEIICHI
IPC分类号： G01N29/24 , G01N29/04
摘要： PURPOSE:To facilitate an ultrasonic flaw detection test over the entire circumference of a small-calibre tube, by forming an ultrasonic vibrator as a circular assembly to perform an ultrasonic scanning thereof. CONSTITUTION:Numerous ultrasonic vibrators 2 are arranged circularly in several rows inside a dividable doughnut-shaped body 1 and as many pin connectors 3 as the vibrators 2 are arranged on the circumference of the body 1. The vibrators 2 are linked to the connectors 3 respectively through a lead 4. In the assembly of such a circular vibrator 2, the transmission and reception of ultrasonic waves are switched sequentially utilizing an external phase control type ultrasonic flaw detection tester. This enables ultrasonic flaw detection in the circumferential direction of a tube by electronic scanning.

5. 发明专利

JPS6321497A HEAT TRANSFER PIPE SHIELDING DEVICE FOR STRAIGHT PIPE TYPE HEAT EXCHANGER 失效
公开(公告)号：JPS6321497A
公开(公告)日：1988-01-29
申请号：JP16365286
申请日：1986-07-14
申请人： HITACHI LTD
发明人： YANOHARA KATSUO , UCHIYAMA YOSHIO , KAWASAKI YOJI , NOMURA KEIICHI
IPC分类号： F28F11/04
摘要： PURPOSE:To make the kinds of parts small in number and not to give any change in the composition of a heat transfer pipe by machining suitable threads on both ends of a round rod stock material and providing cap nuts to the respective ends and embedding an elastic ring and back-up ring into the cap nut. CONSTITUTION:At one end of a bolt 5 provided with threads on both sides a cap nut 6, back-up ring 8 and elastic ring 7 are beforehand provided and this bolt is inserted into a heat transfer pipe 4 from its one end. When the end of the bolt 5 is observed at the other end of the heat transfer pipe 4, it is closed by applying to the end of the bolt an elastic ring, back-up ring, and cap nut in this order, and lastly the cap nut is tightened. The materials used for the bolt, cap nut, and back-up ring are selected with consideration given to temperature and pressure. As for the elastic ring, a ring which is worked in the shape of an O-ring is used and it is deformed when the cap nut is tightened so that it can close the heat transfer pipe.

6. 发明专利

JPS6268501A WASTE LIQUID CONCENTRATING APPARATUS OF EXTERNAL-HEATING FORCED-CIRCULATION TYPE 失效
公开(公告)号：JPS6268501A
公开(公告)日：1987-03-28
申请号：JP20651085
申请日：1985-09-20
申请人： HITACHI LTD
发明人： YANOHARA KATSUO , UCHIYAMA YOSHIO , NOMURA KEIICHI , OTANI ISAO
IPC分类号： C02F1/04 , B01D1/12 , C02F1/06 , G21F9/00 , G21F9/08
摘要： PURPOSE:To reduce the number of component parts within an evaporator, by introducing waste liquid of a concentrating apparatus of waste liquid into the central part of the evaporator, distributing and discharging said waste liquid by means of a header, a plurality of discharge holes being provided on the side and on the lower part of said header. CONSTITUTION:Waste liquid flows into an evaporator 13, where flash evaporation of said liquid occurs in an evaporating chamber 20, vapors being discharged from said evaporator through a vapor outlet 11 to the outside, waste liquid to be recirculated being discharged from a hopper for retaining liquid 21 to a recirculation pipe 16. A header for discharging liquid 22 is provided on the end, inside the evaporator 13, of an inlet pipe for heated waste liquid 10, a plurality of discharge holes 23 being provided on said header. Waste liquid fed through said inlet pipe for heated waste liquid 10 flows into the header 22 to be distributed into the evaporator 13 through the discharge holes 23. Since a plurality of discharge holes for waste liquid 23 are provided on a level with the center line of said header and thereunder, discharged waste liquid does not spout out upward.

7. 发明专利

JPH05107385A ULTRASONIC FLAW DETECTION DEVICE 失效
公开(公告)号：JPH05107385A
公开(公告)日：1993-04-27
申请号：JP27068391
申请日：1991-10-18
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NOMURA KEIICHI , KUROSAWA KOICHI , YOKOYAMA MINORU
IPC分类号： G01N29/26 , G21C17/003
摘要： PURPOSE:To perform a test without human approaching the lower portion of the inside of a nuclear reactor by installing a flaw detection device under water from above the nuclear reactor to perform flaw detection in order to inspect an access hole cover, and achieving processes up to removal of the device through remote control. CONSTITUTION:To make sure the sanity of an access hole cover 1 mounted to a ring-shaped buffle plate 6 a welding portion 3, a flaw detection device 13 is passed through the hole of a guide block 7 and mounted on the cover 1. Remote control is performed from a fuel exchange truck 10 and the device 13 is set in a predetermined position from the truck 10 using a winch 11 and the device 13 is controlled by a controller 14. Rotary scanning by a probe 26 is done by a motor 15 for rotation and radial scanning is done by a piston 22 and ultrasonic signals of scanning are transmitted to a flaw detector on the truck 10 through a flaw detection cable 27. The motor 15 is controlled by the controller 14 via a control cable 32. The piston 22 is remote controlled by a water hose 23. Thus flaw detection can be performed wholly by remote control.

8. 发明专利

JPH03189543A INSPECTION DEVICE FOR INTERNAL SURFACE OF SMALL-DIAMETER TUBE 失效
公开(公告)号：JPH03189543A
公开(公告)日：1991-08-19
申请号：JP32847289
申请日：1989-12-20
申请人： HITACHI LTD
发明人： NOMURA KEIICHI , OGURI TADAKAZU , MIURA SHIRO
IPC分类号： G01N21/88 , F17D5/06 , G01N21/954 , G01N27/90 , G21C17/003
摘要： PURPOSE:To inspect the internal surface of the small-diameter tube remotely and automatically by a visual test and an eddy current flaw detection test by fitting a small-sized television camera and an eddy current flaw detection coil to the same flaw detection head and thus constituting an integrated flaw detection head, and arranging the eddy current flaw detection coil in the visual field of the camera. CONSTITUTION:The small-sized television camera 6 and eddy current flaw detection coil 7 are fitted to the same flaw detection head 8. The flaw detection head 8 inspects the internal surface of a neutron flux detector housing 3 by the visual test and eddy current flaw detection test at the same time. Further, the flaw detection head 8 is coupled with a driving device 10 through a rod 9 and the driving device 10 is controlled by a controller 12 to inspect the internal surface of the neutron flux detector housing 8 remotely and automatically. Further, a position signal is inputted from the controller 12 to an eddy current flaw detection recording device 15 connected to an eddy current flaw detector 14 to generate eddy current flaw detection records including inspection position information.

9. 发明专利

JPH01153956A ULTRASONIC PROBE FOR PIPING 失效
公开(公告)号：JPH01153956A
公开(公告)日：1989-06-16
申请号：JP31199687
申请日：1987-12-11
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NOMURA KEIICHI , KANDA TETSUO , HIGUCHI SHINICHI , MIURA SHIRO , KOJIMA SHINSAKU
IPC分类号： G01N29/04 , G01N29/24
摘要： PURPOSE:To perform flaw detection under the best conditions by fitting a holder where the ultrasonic probe is fixed to a scanner head by using springs and directing the ultrasonic probe accurately to the center of the piping. CONSTITUTION:The holder 2 where the ultrasonic probe 1 is fixed is fitted to the scanner head 3 by using the coil springs 4. Then when the probe 1 is pressed slantingly against the piping 5, one spring 4 contracts and the other expands, but the probe 1 is directed to the center of the piping 5 automatically with the restoring force of the expanded spring 4. Consequently, the flaw detection is performed under the best conditions.

10. 发明专利

JPH05209864A ULTRASONIC FLAW DETECTOR 失效
公开(公告)号：JPH05209864A
公开(公告)日：1993-08-20
申请号：JP1593692
申请日：1992-01-31
申请人： HITACHI LTD
发明人： NOMURA KEIICHI , HIGUCHI SHINICHI
IPC分类号： G01N29/04 , G01N29/26 , G21C17/003
摘要： PURPOSE:To improve reliability of inspection by a method wherein a flaw detector is compressed when it is inserted into a hollow frustum of cone and opens until it is extended against an inner face of the structure by remote control in the vicinity of the bottom. CONSTITUTION:A slider 18 provided on a pole 8 is positioned downward when it is inserted from a top opening of a structure, while a movable arm 16 and a rim 17 stay hung downward. After the insertion, the slider 18 is pulled up by pulling up a rope 19 so that the arm 16 coupled to it is pulled up to be extended against an inner face of the structure. That is, a rotation center axis of a probe 14 and an axis of the structure are made to match each other, so that distances from the probes 14 to structure bottom welded portions 6, 7 can be kept constant. Ultrasonic waves generated from the probes 14 propagate in the water to be incident from inside the structure. One of the probes 14 is a normal type which searches for a signal from cracking or the like produced at the welded portions 6, 7 or their vicinity while the other is a high frequency probe which searches for a noise signal from the welded portions 6, 7.

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