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41. 发明专利

JPH11295119A FLOW DETECTING METHOD OF HYDRAULIC MACHINERY 失效
公开(公告)号：JPH11295119A
公开(公告)日：1999-10-29
申请号：JP9916598
申请日：1998-04-10
申请人： HITACHI LTD
发明人： OKAMURA TOMOYOSHI , YAMADA MASAYUKI , SATO YUTAKA
IPC分类号： G01F1/66
摘要： PROBLEM TO BE SOLVED: To perform a high-precision flow detection securely and inexpensively regardless of properties of a liquid to be detected, by improving S/N ratio of ultrasonic received signals. SOLUTION: In this flow detecting method, in which a velocity distribution on a prescribed section in the channel in a rainwater drainage pump is detected by a pulse-Doppler type ultrasonic current meter, and a flow rate Q is calculated by using the detected velocity distribution V(x) and a sectional area of the prescribed section, bubbles 105 are supplied into pumped storage by a particle supply means 102 on the lower part of a suction bell mouth.

42. 发明专利

JPH11223541A CALIBRATION TESTING DEVICE FOR PULSE DOPPLER TYPE ULTRASONIC FLOWMETER 失效
公开(公告)号：JPH11223541A
公开(公告)日：1999-08-17
申请号：JP2418698
申请日：1998-02-05
申请人： HITACHI LTD
发明人： OKAMURA TOMOYOSHI , YAMADA MASAYUKI , SATO YUTAKA
IPC分类号： G01F1/66 , G01F25/00
摘要： PROBLEM TO BE SOLVED: To operate flow measuring test equivalent to a large bore without using any flowing device with a large capacity, to greatly reduce a power necessary for the test, to attain a variety of test, and to attain the optimization and measuring precision improvement of a flowmeter. SOLUTION: A plurality of measuring pipes 5 are provided in a vessel 2 so that liquid can circulate in the measuring pipes 5, and an ultrasonic sensor 1 is provided on the outer wall of the vessel 2 so that flow velocity in the measuring pipes in the vessel can be measured, and a flow rate can be calculated. The flow rate in the measuring pipes 5 can be measured by a flowmeter for calibration provided at the outside part, and both the flow rates are compared so that measuring precision can be obtained.

43. 发明专利

JPH11108721A PULSE DOPPLER ULTRASONIC WAVE FLOW VELOCITY MEASURING EQUIPMENT 失效
公开(公告)号：JPH11108721A
公开(公告)日：1999-04-23
申请号：JP27083797
申请日：1997-10-03
申请人： HITACHI LTD
发明人： OKAMURA TOMOYOSHI , YAMADA MASAYUKI , KATAKURA KAGEYOSHI
IPC分类号： G01F1/66
摘要： PROBLEM TO BE SOLVED: To reduce the attenuation of an ultrasonic wave signal in a flow route wall and to increase the S/N of the signal so as to improve measuring accuracy by directly exposing an ultrasonic wave transmitting/receiving device in the flow route. SOLUTION: An ultrasonic wave transmitting/receiving device 5 is fixed to a flow route wall 1 by a screw or adhesive, the tip surface 5a thereof is exposed in the inner surface of the flow route wall 1 while being prevented from being projected from an inner surface wall 1a and set to a height equal to that of the inner surface wall 1a. A voltage pulse to be measured is outputted from a signal processor 3 according to a flow velocity and a measuring distance, converted into an ultrasonic wave 6 having the same frequency by a piezoelectric element 5b and then transmitted from the transmitting/receiving device end surface 5a. In this case, since the ultrasonic wave 6 is radiated into a fluid without being passed through the flow route wall 1, the attenuation of the ultrasonic wave caused by the flow route wall 1 is prevented, and the strong ultrasonic wave 6 is radiated into the fluid. The pulse-like ultrasonic wave 6 is dispersed and reflected by fine particles 7 in the fluid, and a reflected wave 8 is directly received by the transmitting/receiving device 5 without being attenuated by the flow route wall 1. Thus, S/N during measuring is increased, and flow velocity measuring accuracy is improved.

44. 发明专利

JPH10239127A METHOD AND DEVICE FOR DETECTING FLOW RATE OF FLUID MACHINE 失效
公开(公告)号：JPH10239127A
公开(公告)日：1998-09-11
申请号：JP3922097
申请日：1997-02-24
申请人： HITACHI LTD
发明人： OKAMURA TOMOYOSHI , YAMADA MASAYUKI , KATAKURA KAGEYOSHI , KOGA MASAAKI
IPC分类号： G01F1/66
摘要： PROBLEM TO BE SOLVED: To provide a method and device for detecting the flow rate of fluid machine that can detect the flow rate of an already existing fluid machine with high accuracy at a low cost. SOLUTION: In the method for detecting flow rate of fluid machine, in which the flow rate Q of a fluid in at least one cross section of a flow passage in a fluid machine or flow passages before and after the fluid machine is detected, the acoustic velocity C in the fluid at the objective cross section or its vicinity is detected by means of an ultrasonic current meter 102 for detecting acoustic velocity and the velocity distribution V(x) at the objective cross section is detected by means of a pulse Doppler type ultrasonic current meter for detecting flow velocity. Then, the flow rate Q is calculated by using the velocity distribution V(x) and the cross-sectional area of the objective cross section.

45. 发明专利

JPH1030588A PRECEDING STAND-BY VERTICAL PUMP 失效
公开(公告)号：JPH1030588A
公开(公告)日：1998-02-03
申请号：JP18751996
申请日：1996-07-17
申请人： HITACHI LTD
发明人： YAMAGUCHI AKIRA , YAZAWA SETSUO , YAMADA MASAYUKI , KIMURA JINJI , MATSUI SHIRO
IPC分类号： F04D13/00
摘要： PROBLEM TO BE SOLVED: To discharge water in a pump in an early stage during stand-by operation after pumping is stopped by arranging a first communicating hole on a pumping pipe and the like, and communicating one end of an air vent pipe whose the other end is connected to an air vent hole arranged on the front and rear parts of a discharging valve, with the atmosphere on the upper part of the maximum water level of a discharging tank. SOLUTION: A discharging pipe 7 is connected to a discharging elbow 6 connected to a pumping pipe 5 and an intermediate bearing support 9 through a discharging valve 8. An air vent pipe 16 provided with an opening part 19 is connected to an air vent hole 15 arranged on the rear downstream side of the heights discharging valve 8 of the discharging pipe 7. Openings 10 are arranged as a first opening on the pumping pipe 5 and the intermediate bearing support 9 respectively. When pumping is stopped and stand-by operation is carried out, water in a pump is held in the pumping pipe 5 by rotation of an impeller 1. But air flows from the air vent pipe 16, the inside of the pump is opened to the atmosphere in an earlier stage, and thereby, water held in the pump is rapidly discharged from the openings 10 arranged on the pumping pipe 5 and the intermediate bearing support 9.

46. 发明专利

JPH08284874A VERTICAL SHAFT PUMP AND PUMPING UNIT 失效
公开(公告)号：JPH08284874A
公开(公告)日：1996-10-29
申请号：JP8533595
申请日：1995-04-11
申请人： HITACHI LTD
发明人： YAMAGUCHI AKIRA , YAZAWA SETSUO , YAMADA MASAYUKI
IPC分类号： F04D15/00 , F04D13/00
摘要： PURPOSE: To provide a vertical shaft pump and a pumping unit, eliminating any delay in the start of pumping (discharge), reducing a burden to be imposed on an impeller, and making power consumption during standby operation reducible and capable of restraining a rise in water temperature in a lifting pipe. CONSTITUTION: A vertical shaft pump 20 set up in a pump suction tank 21 opens a drain hole 9 on top of an impeller 1 of a casing runner 2, and it is provided with a drainpipe 10 whose one end is connected to this drain hole 9 and the other end is connected to an on-off device opening or closing in linkage with a water level of the suction tank. In addition, an air vent hole 15 opening to an more upper part than the central line is installed in a horizontal part of a delivery pipe 7 of a pumping plant, and further it is provided with a bypass pipe 16 whose one end is connected to this air vent hole 15 and the other end is opened to an more upper part than a design highest water level DHWL of a delivery water tank.

47. 发明专利

JPH07182361A IMAGE FILING DEVICE 失效
公开(公告)号：JPH07182361A
公开(公告)日：1995-07-21
申请号：JP32370593
申请日：1993-12-22
申请人： HITACHI LTD
发明人： YAMADA MASAYUKI
IPC分类号： G06F17/30
摘要： PURPOSE:To shorten the retrieval time of data as to the electronic filing device which stores image data on a storage medium, and retrieves, displays, and outputs image data required among the stored image data. CONSTITUTION:The same 22 of a station where image data read out of an optical device are stored, the cabinet name 23, file name 24, document name 21, and image ID 25 are added to the image data, which are stored on a magnetic disk device on the system. For a 2nd or succeeding retrieval, the name of a document which is already retrieved from the magnetic disk device and stored is displayed to give an operator a chance to select. Consequently, when the same image data are retrieved again, the time required for the retrieval is shortened.

48. 发明专利

JPH0763196A VERTICAL SHAFT PUMP PROVIDED WITH DOUBLE VOLUTE CASING 失效
公开(公告)号：JPH0763196A
公开(公告)日：1995-03-07
申请号：JP20625893
申请日：1993-08-20
申请人： HITACHI LTD
发明人： AKIBA HIDEKI , YAZAWA SETSUO , TAKADA KUNIO , NAGASAWA SHIGENOBU , YAMADA MASAYUKI
IPC分类号： F04D5/00 , F04D29/44
摘要： PURPOSE:To reduce a required installation space and to smooth water flow by forming a partition wall, which is situated between two passages in a casing and separates them from each other, of steel material. CONSTITUTION:A double volute casing is provided with two passages, in which water flows setting a shaft center of a pump as the center, and these two passages are separated from each other by a partition wall 1 spirally extending from one point on the outside of an impeller. A passage outlet part of the casing consists of an upper partition wall supporting plate 2 and a lower partition wall supporting plate 3, each of which individually extends from the upper end or the lower end of the partition wall 1 to both of right and left sides, and an outside passage wall 4 and an inside passage wall 5, both of which are formed into U-shapes, while setting the steel thick partition wall 1 as the center. The outside passage wall 4 and the inside passage wall 5 consist of steel plates which is considerably thinner than the partition wall 1. Therefore, the thickness of the partition wall 1 can be reduced in comparison with a concrete wall, and the size of the casing can be reduced by this thinned portion. On the other hand, a change in flow velocity of water in the tip part of the partition wall 1 splitting the water flow is reduced, so that a loss in a pump head can be reduced.

49. 发明专利

JPH0693407A BEARING DEVICE AND DRAINAGE PUMP AND HYDRAULIC TURBINE WITH THE SAME AND MANUFACTURE OF BEARING DEVICE 失效
公开(公告)号：JPH0693407A
公开(公告)日：1994-04-05
申请号：JP8113693
申请日：1993-03-17
申请人： HITACHI LTD
发明人： OKADA RYOJI , YAMADA MASAYUKI , TAKADA KUNIO , OTANI KENJI , AIZAWA KOJI , HANEDA MITSUAKI , YAMADA TOSHIHIRO
IPC分类号： C23C4/10 , F16C33/12
摘要： PURPOSE:To manufacture a bearing part excellent in wear resistance and assembling properties by thermal-spraying a thermally sprayed film consisting essentially of WC or Cr3, C2, thereafter heating it in specified conditions and forming pores with specified density on the surface of the thermally sprayed film. CONSTITUTION:The sliding face of a bearing or a sleeve is coated with the thermally sprayed film consisting essentially of WC and contg. a binder of Ni, Cr and Co. Or, it is applied with the thermally sprayed film consisting essentially of Cr3 C2 and contg. a binder of NiCr. The applied thermally sprayed film is heated at about 300 to 550 deg.C for about >=1hr to regulate its coating hardness to >=1000 in Vickers hardness. Furthermore, the density of pores having >=20mum dimension formed on the surface of the thermally sprayed film is regulated to . Thus, ductility is imparted to the coating, its resistance to impact is increased and the fracture and peeling of the film are reduced. As for a drainage pump using this bearing device, operation in a lubricant free state is permitted even if it is used as the one for advance standby operation.

50. 发明专利

JPH05202892A VERTICAL SHAFT STORAGE PUMP 失效
公开(公告)号：JPH05202892A
公开(公告)日：1993-08-10
申请号：JP1368892
申请日：1992-01-29
申请人： HITACHI LTD
发明人： AIZAWA KOJI , ARAI KATSUTOSHI , OKADA RYOJI , YAMADA MASAYUKI , TAKADA KUNIO
IPC分类号： C10M103/00 , C10M173/00 , C10N40/02 , F04B53/00 , F04D13/00 , F04D29/046 , F04D29/06 , F16C17/14 , F16C33/24
摘要： PURPOSE:To carry out stable repetitive running for a lone period by accommodating a bearing at the pumping passage of a pump, placing a rotary lubricating oil tank which is provided with an opening part communicating with the pumping passage, and using its fluid to be pumped as lubricating fluid without feeding lubricating fluid from the outside of the pump. CONSTITUTION:In this pump, a rotating shaft 3 where a blade is fixed is overhung and supported by a ceramic bearing device. Besides, the bearing device is provided with a ceramic bearing 6 which slidably-supports a sleeve 5 fixed at, the rotating shaft 3 and a bearing easing 9 elastically-jointed with a bearing case 7 where the ceramic bearing 6 is installed by an elastic member 8. With this constitution, a fluid reservoir layer 10 is disposed at the outer peripheral side of the rotating shaft 3 so as to surround the lower edge surface and the outer peripheral side of the bearing casing 9. Moreover, lubricating fluid is fed in the fluid reservoir layer 10 which is assembled before its installation. Then the lifting pump is driven by its lifting fluid in itself. It is thus possible to slide the ceramic bearing 6, being submerged in lubricating fluid constant.

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