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1. 发明专利

JPH11148491A FIBER REINFORCED PLASTIC IMPELLER 失效
公开(公告)号：JPH11148491A
公开(公告)日：1999-06-02
申请号：JP31486597
申请日：1997-11-17
申请人： HITACHI LTD
发明人： HINO SHOJI , MORI YASUSHI
IPC分类号： F04D29/02 , F04D29/28
摘要： PROBLEM TO BE SOLVED: To reduce the stress of a joint part between a blade and a core side plate by determining a content of fiber in FRP forming the blade, high in a joint part between the blade and a core plate and that between the blade and a side plate, and low in an area separated from the joint part. SOLUTION: In the analyzation of the stress generation mechanism on a joint part between a blade and a core side plate where the stress of a FRP centrifugal impeller becomes highest, the stress caused by the centrifugal force of a central part of the blade occupies the largest ratio. Accordingly by lowering a content of fiber in the central part of the blade and reducing the centrigugal force of this part, a bending moment of the joint part with the core side plate is reduced. On the other hand, by increasing the content of the fiber in the joint part with the core side plate and increasing the strength of this part, the strength of the impeller can be totally improved.

2. 发明专利

JPH10160712A INSPECTION APPARATUS FOR IMPELLER 失效
公开(公告)号：JPH10160712A
公开(公告)日：1998-06-19
申请号：JP31588396
申请日：1996-11-27
申请人： HITACHI LTD
发明人： MORI YASUSHI , YAMAGISHI YOSHIKATSU
IPC分类号： G01N29/04 , G01N29/26 , G01N29/10
摘要： PROBLEM TO BE SOLVED: To obtain an inspection apparatus whose inspection efficiency and inspection accuracy are enhanced by a method wherein a sensor is moved in the circumferential direction in such a way that it is moved at a low speed near its bonding part to an impeller and that it is moved at a high speed in a part at a distance from the bonding part. SOLUTION: An ultrasonic beam is impinged, via a sensor 3, on an impeller, to be measured, which is mounted on a positioner 1 which is installed in a water tank 2, and the impeller is inspected. At this time, the relative position of the impeller, to be measured, to the sensor 3 is controlled by an arm 4 at a robot. The sensor 3 is moved at a low speed near its bonding part, to the impeller, in which a stress is high and in which a defect is easy to generate, and a sampling density is increased. The sensor is moved at a high speed in a part, at a distance from the bonding part, in which a stress is low and in which a defect is hard to generate, and a sampling density is lowered. A detected echo signal is changed into a digital signal by an analyzer 5, and the detect of the impeller to be measured is inspected.

3. 发明专利

JPH09325136A AUTOMATIC DEFECT EVALUATING METHOD FOR CENTRIFUGAL TYPE IMPELLER 失效
公开(公告)号：JPH09325136A
公开(公告)日：1997-12-16
申请号：JP14133896
申请日：1996-06-04
申请人： HITACHI LTD
发明人： YAMAGISHI YOSHIKATSU , MORI YASUSHI
IPC分类号： G01N29/04 , G01N29/22 , G01N29/44 , G01N29/10
摘要： PROBLEM TO BE SOLVED: To detect a defect with high precision by storing a stress distribution of an impeller under a used condition in an impeller form storage device, and moving a focus of a beam along a part where the highest stress is generated in the stress distribution in a plate-thickness direction. SOLUTION: A sample impeller 1 and a positioner 2 are provided in a water tank 3, and ultrasonic wave generated by an ultrasonic wave generating device 4 is made incident to the impeller 1 through a probe 5. By controlling an arm 6 of a robot with a robot control device 7, a relative position of the probe 5 to the impeller 1 is controlled, to move a to be probed surface. Dimension, positional relation and stress of each part of the impeller 1 after worked into a normal dimension is inputted in advance to an impeller form storage device 8. A detection signal of the echo is analyzed with an ultrasonic echo analysis device 10, and position and size of a defect are stored. In addition, based on them and magnitude of the stress which is stored in the device 8, a parameter which shows significance of the defect is calculated, and displayed on an analysis result display device 11. Here, in parameter σ×a , σis the stress of the defective part, and (a) is the size of the defect.

4. 发明专利

JPH07229687A PLATE TYPE HEAT EXCHANGER 失效
公开(公告)号：JPH07229687A
公开(公告)日：1995-08-29
申请号：JP1963994
申请日：1994-02-16
申请人： HITACHI LTD
发明人： NISHIKAWA KENJI , NARUSE TAKAO , MORI YASUSHI , URAKI YASUO
IPC分类号： F28D9/00 , F28F3/00 , F28F3/08 , F28F9/02
摘要： PURPOSE:To improve a method for joining an opening part of a heat transfer plate with a fluid inlet-outlet part, to avoid stress concentration in a joining part and to prevent breakdown of a connecting part, mixing of a fluid and a leakage thereof. CONSTITUTION:In a plate type heat exchanger wherein a plurality of heat transfer plates 2 having indentations formed are stacked in a holding vessel 3, a wave-shaped recession 9 is provided in the immediate periphery of an opening part of a heat transfer plate 2' joining with a fluid inlet-outlet piping 7 or a wave-shaped ring is interposed between the holding vessel 3 and the opening part of the heat transfer plate 2' joining with the vessel, so as to give a shape reducing of a thermal stress applied to the joining part of the inlet-outlet piping 7 of a high-temperature or low-temperature fluid or the holding vessel 3 with the opening part of the heat transfer plate. By this structure, the thermal stress in a connecting part of the heat transfer plate with the fluid inlet-outlet part can be reduced sharply and the durability and reliability can be improved by preventing breakdown of the connecting part and liquid junction of the fluid. Besides, the degree of freedom of selection of materials of the heat transfer plate, the fluid inlet-outlet piping and the holding vessel is increased, which is advantageous to practical use.

5. 发明专利

JPS6420429A FATIGUE TESTING MACHINE 失效
公开(公告)号：JPS6420429A
公开(公告)日：1989-01-24
申请号：JP17469787
申请日：1987-07-15
申请人： HITACHI LTD
发明人： MORI YASUSHI
IPC分类号： G01N3/36 , G01N3/00 , G01N13/04
摘要： PURPOSE:To eliminate the need of a load loading mechanism of the outside by forming an axis itself to be sampled as a hollow axis, leading hydraulic pressure into the inside, and generating pressure and stress by itself. CONSTITUTION:As for a axis 1 to be sampled having a hollow structure, a hub 3 is fitted, and to both its ends, end covers 4, 5 are attached through many clamping bolts 6 arranged on a pitch circle. On the inner peripheral surface of the cover 4, a second hollow axis 2 which can slide freely in the axial direction is inserted. On the cover 5, two pairs of holes for supplying and discharging hydraulic pressure to and from the inside of the axis are provided. One pair of them is a port 17 for taking in and out oil between the sample axis 1 and the hollow axis 2. The other is a port 18 for taking in and out oil of the hollow axis 2. In this state, the relative slide quantity at the a strain axis of the axis 1 and the fitting part of the hub 3 is detected, and it is fed back. By controlling independently the hydraulic pressure of two systems, the surface pressure, the axial direction stress and the sliding quantity can be controlled. In such a way, the load loading mechanism of the outside is eliminated.

6. 发明专利

JPS55147329A VIBRATOR FOR IMPELLER 失效
公开(公告)号：JPS55147329A
公开(公告)日：1980-11-17
申请号：JP5422979
申请日：1979-05-04
申请人： HITACHI LTD
发明人： MORI YASUSHI , SAKATA SHIYOUJI
IPC分类号： F04D29/22 , F04B51/00 , G01M7/00 , G01M7/02
摘要： PURPOSE:To cause a strong vibrating force and accurately measure the vibration strength characteristic of an impeller of high rigidity, by providing AC coils of different polarity at the peripheral part of the impeller and overlapping a DC coil with the AC coils. CONSTITUTION:Two magnets 2, 3 are placed near the central plate 11 and side plate 12 of a radial impeller 1. AC coils 5, 6 of different polarity are provided around the ends of the magnets 2, 3. The other ends of the magnets are connected to each other. A DC coil 4 is mounted around the connected ends of the magnets. A strong vibrating force can be caused by the synthesized magnetic flux of the coils out of contact with the impeller.

7. 发明专利

JP2000145691A CENTRIFUGAL IMPELLER 失效
公开(公告)号：JP2000145691A
公开(公告)日：2000-05-26
申请号：JP32166798
申请日：1998-11-12
申请人： HITACHI LTD
发明人： MORI YASUSHI
IPC分类号： F04D29/28 , C21D9/00
摘要： PROBLEM TO BE SOLVED: To secure torque transmission and improve in-plane strength by providing a taper in a part to be an abutment face in fastening a shaft in the internal circumference of a core plate of a vane and by axially pinching an impeller by a fastening bolt or a fastening nut from the opposite side face to fix to a shaft. SOLUTION: This centrifugal impeller is constituted of a core plate 1, a side plate 2, and a vane 3, a taper 5 is provided in a part to be an abutment face in fastening a shaft in the internal circumference of the core plate 11 of the vane 3, and the taper 5 part is case-hardened. Besides, the impeller is axially pinched by a fastening bolt or nut from the opposite face to be fixed to the shaft 2. By this constitution, the internal circumferential part of the core plate can be enlarged by centrifugal stress so as to reduce the plate thickness, and further, since the recess-side taper 5 worked in the shaft 2 is little deformed by the rotation and the taper 5 in the projection part of the impeller restricts the rotation deformation, the torque transmission can be secured and the in-plane strength can be improved.

8. 发明专利

JP2000018192A CENTRIFUGAL IMPELLER 失效
公开(公告)号：JP2000018192A
公开(公告)日：2000-01-18
申请号：JP18857398
申请日：1998-07-03
申请人： HITACHI LTD
发明人： IWATA ATSUSHI , MORI YASUSHI
IPC分类号： F04D29/30
摘要： PROBLEM TO BE SOLVED: To relieve the centrifugal stress during the operation of the impeller and improve the strength thereof, by heating the entire impeller and then quickly cooling only the circumferential portion of the core plate, generating local elastic deformation in the inner peripheral portion by the heat stress which is generated during the quick cooling, thereby generating residual stress of compression. SOLUTION: In a device that applies residual stress, an inner peripheral portion of an impeller comprising a core plate 1 and a vane 2 is cooled by cooling water passed by a piping 3 inserted therein. A jig 4 is mounted near the outer peripheral portion of the core plate 1 for heating it with a high frequency current, and a jig 5 is mounted near the vane 2 for heating it with a high frequency current. When the inner peripheral portion of the impeller is cooled and the outer peripheral portion is heated with this device, temperature difference occurs between the inside and outside of the impeller. As results, a tensile stress is generated in the inner peripheral portion, while a thermal stress of compression stress is generated in the outer peripheral portion. With increased difference in temperature, the tensile stress in the inner peripheral portion exceeds the yield point, and an elastic deformation occurs. If the temperature is lowered to the ordinary temperature in this state, a residual stress of compression remains in the inner peripheral portion.

9. 发明专利

JPH11148885A ROTATION STRENGTH TESTING APPARATUS 失效
公开(公告)号：JPH11148885A
公开(公告)日：1999-06-02
申请号：JP31486697
申请日：1997-11-17
申请人： HITACHI LTD
发明人： YAMAGISHI YOSHIKATSU , MORI YASUSHI
IPC分类号： G01B11/00 , F01D25/00 , F02C7/00 , G01M13/00
摘要： PROBLEM TO BE SOLVED: To separate influence by a vibration from that by a thermal expansion by detecting by two optical position detectors a position change in a radial direction of a concentric light-shade pattern of an outer circumferential part of a sample impeller, obtaining a difference of the position changes and measuring the temperature in a noncontact manner. SOLUTION: A concentric light-shade pattern is plotted on a surface of a core plate of a sample impeller 7, and the change in a boundary position between the light and shade is detected by optical detectors 4, 5 set symmetrically with respect to the center of a rotary shaft. A difference of detected amounts by the optical detectors 4, 5 becomes a change amount of a diameter from which influences of a vibration are offset. A temperature change ΔT of the sample impeller 7 is measured by a noncontact thermometer 6, and a change amount ΔT×α×d because of the temperature change is calculated with the use of a diameter (d) of the boundary position of the light and shade and a coefficient of linear expansion α, so that the change amount is offset. Accordingly the change in an outer shape of the sample impeller 7 can be measured in real time during a rotation test, and a rotational frequency when a plastic deformation is brought about can be easily detected.

10. 发明专利

JPH09325135A AUTOMATIC DEFECT EVALUATING METHOD 失效
公开(公告)号：JPH09325135A
公开(公告)日：1997-12-16
申请号：JP14133796
申请日：1996-06-04
申请人： HITACHI LTD
发明人： YAMAGISHI YOSHIKATSU , MORI YASUSHI
IPC分类号： G01N29/04 , G01N29/22 , G01N29/44 , G01N29/10
摘要： PROBLEM TO BE SOLVED: To decide whether allowable or not by causing an impeller to generate a stress similar to an actual using condition in the middle of an ultrasonic flaw detection inspection, inspecting a growth condition of a defect before and after it, and calculating signs of growth. SOLUTION: A sample impeller 1 and a positioner 2 are provided in a water tank 3, and ultrasonic wave from an ultrasonic wave generating device 4 is made incident to the impeller 1 through a probe 5, with an arm 6 of a robot controlled by a robot control device 7, a relative position of the probe 5 to the impeller 1 is controlled to move a to be probed surface. Based on a detection signal of the echo, position and size are recorded with an analysis device 10. To a load applying device 11 which is inserted between vanes of the impeller 1, operating oil is supplied from a hydraulic power source 14 through a piping 12 and a servo valve 13. The load is controlled with a load control device 15. After loading specified repeated load, position and size of a defect of the same place are recorded again with the device 10. By comparing them with the last one, it is confirmed whether the defect have grown or not.

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