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1. 发明专利

JPH01228516A TREATMENT OF SLUDGE AND APPARATUS THEREFOR 失效
公开(公告)号：JPH01228516A
公开(公告)日：1989-09-12
申请号：JP5150588
申请日：1988-03-07
申请人： HITACHI LTD , YOSHINO YOSHIYA
发明人： MISUMI YOJI , YOSHINO YOSHIYA
IPC分类号： B01D33/06 , B01D24/46 , B01D33/44 , B01D33/58 , B01D37/02 , C02F11/12
摘要： PURPOSE:To enable self-sustained combustion of dehydrated cake formed with sludge by allowing an auxiliary to stick on the surface of a filter drum and allowing sludge to stick on the surface of the auxiliary layer obtained by dehydrating it with vacuum suction and peeling the composite layer of the auxiliary layer and the sludge layer with a blade. CONSTITUTION:Sludge is allowed to stick on a filter drum 1 and a dehydrated sludge layer is formed on the surface of the filter drum by sucking sludge at vacuum and sludge is treated by peeling this sludge layer with a knife 12. In this case, the auxiliary (e.g. pulverized coal) is allowed to stick on the surface of the filter drum and the dehydrated auxiliary layer A is formed by sucking the auxiliary at vacuum to dehydrate the water incorporated therein and thereafter sludge is allowed to stick on the surface of the auxiliary layer A and the dehydrated sludge layer is formed by sucking it at vacuum to dehydrate the water incorporated in sludge and the composite of the auxiliary layer and the sludge layer is peeled with the knife 12. As a result, the calorific value of dehydrated cake formed by sludge is made large: it is made capable of self- sustained combustion and sludge can be easily treated.

2. 发明专利

JPH06241200A NOISE REDUCTION DEVICE FOR TURBO MACHINE 失效
公开(公告)号：JPH06241200A
公开(公告)日：1994-08-30
申请号：JP2649493
申请日：1993-02-16
申请人： HITACHI LTD
发明人： TAKAGI YUKISHI , MISUMI YOJI , UEYAMA TOSHIHARU
IPC分类号： F04D29/66
摘要： PURPOSE:To reduce resonance of noises at a specified rotational speed by providing damping structural bodies in fitting parts of outer and inner casings. CONSTITUTION:A multistage inner casing 3 composing a flow passage of a rotational multistage centrifugal impeller 2 is arranged in a thick outer casing 1. A damping structural body 6 is arranged in a gap in a fitting part of the inner and outer casings 3, 1 in a radial direction. An damping structural body 7 is also arranged in a gap in a fitting part of the inner and outer casings 3, 1 in the axial direction. Similarly, damping structural bodies 8, 9 are arranged on other axial gaps. Noises can be eliminated by the damping structural bodies 6 to 9. As a result, resonance of the inner casing 3 is avoided. Force to be transmitted to the outer casing 1 is decreased, and emitting noises can be reduced.

3. 发明专利

JPH02149796A MAGNET PUMP, MANUFACTURE THEREOF, AND NUCLEAR REACTOR USING MAGNET PUMP 失效
公开(公告)号：JPH02149796A
公开(公告)日：1990-06-08
申请号：JP30050788
申请日：1988-11-30
申请人： HITACHI LTD
发明人： SHIMAGUCHI TAKASHI , YAMADA TOSHIHIRO , NATORI TATSUO , OKADA AKIHISA , MISUMI YOJI
IPC分类号： G21C15/247 , F04D13/02 , G21C15/243 , H02K5/128 , H02K49/10
摘要： PURPOSE:To obtain a large capacity magnet pump having a large maximum energy product by contactedly fitting magnetic pieces on the outer circumferential face of an inner wheel york and on the inner circumferential face of an outer wheel york, covering them with a non-magnetic cylindrical cover, and filling resin in the space parts. CONSTITUTION:A plurality of magnetic pieces 6 are adhered with mutual intervals on the outer circumferential face of an inner wheel york. Hereafter a non-magnetic cylindrical cover such as hastelloy is fitted by plasma welding or the like, between the arranged face with magnetic pieces 6 adhered on the inner wheel york, having space parts 8, and the non-magnetic cylindrical cover 7 is used as substitution of a metal mold. When the magnet 4, 6 are made of neodymium-iron series, temperature rise limit at resin hardening is nearly 80 C. As resin having low temperature rise, for example, silicon rubber and epoxy resin are available. A large capacity magnet pump can be obtained by use of this magnet coupling.

4. 发明专利

JPH07158599A NOISE REDUCING DEVICE FOR TURBOMACHINERY 失效
公开(公告)号：JPH07158599A
公开(公告)日：1995-06-20
申请号：JP30769993
申请日：1993-12-08
申请人： HITACHI LTD
发明人： TAKAGI YUKISHI , IDA DOSHU , MISUMI YOJI , UEYAMA TOSHIHARU
IPC分类号： F04D1/08 , F04D29/66
摘要： PURPOSE:To reduce the occurrence of phenomenon wherein the generation of noise is increased at a specified rotation speed by a method wherein a damping structure is arranged in a gap part in a radial direction between inner and outer casings. CONSTITUTION:A boiler water feed pump is provided with a multistage inner casing 3 having the flow passage of a rotating multistage impeller 2 located in a thick outer casing 1 being called barrel. When high speed fluid is collided with a diffuser, the inner casing 3 is excited. When the frequency of the fluid excitation force coincides with the natural frequency of the structure system of the inner casing 3, the inner casing 3 is resonated and high noise is generated. To prevent the occurrence of the resonance phenomenon, damping structures 10 and 11 formed of a laminate are arranged on an engagement part 4 between the outer and inner casings 1 and 3. This constitution prevents the occurrence of resonance of the inner casing 3 through absorption of energy during vibration of the inner casing 3.

5. 发明专利

JPS61218797A MULTI-STAGE DOUBLE CASING TYPE FLUID MACHINE 失效
公开(公告)号：JPS61218797A
公开(公告)日：1986-09-29
申请号：JP5838985
申请日：1985-03-25
申请人： HITACHI LTD
发明人： MISUMI YOJI
IPC分类号： F04D29/42 , F04D29/58
摘要： PURPOSE:To shorten time necessary for warming by reducing a space between inner and outer casings and providing a passage through which fluid for warming flows stepwise successively so that the flow rate of the fluid increases to increase heat transfer coefficient to the outer casing. CONSTITUTION:Fluid for warming which enters through a warming fluid inlet 7 flows through a narrow space 10 between inner and outer casings 3, 1 in the direction shown by an arrow without separating in the right and left directions. The fluid which reaches a rail 8 is introduced into a next stage through a notched portion 12 to flow in the opposite direction, then the fluid is further introduced into a next stage through a notched portion 12 provided in the same manner. To permit such a flow of the fluid the inner casing 3 has projections 11 disposed at its outer periphery and the notched portion 12 is disposed at the side of the rail 8. Since heat transfer coefficient of fluid to a solid increases in proportion to a flow rate of the fluid to the 0.8th power, an increase in the flow rate of the fluid by such an arrangement permits an increase in its heat transfer coefficient to the outer casing 1 which has the least warming capability and a reduction in warming time.

6. 发明专利

JPS6437000A BEARING DEVICE OF PUMP 失效
公开(公告)号：JPS6437000A
公开(公告)日：1989-02-07
申请号：JP19265087
申请日：1987-08-03
申请人： TOKYO GAS CO LTD , HITACHI LTD
发明人： AOKI NOBUO , SETA AKIO , NAKAJIMA JUNZO , OKADA AKIHISA , MISUMI YOJI , WATANABE TAKAHIRO
IPC分类号： F04D15/00 , F04D29/04 , F04D29/047
摘要： PURPOSE:To improve the pumping-up efficiency by using a portion of the pressurized fluid in the pressure gap part in the thrust balancing device of a shaft, as the pressurized fluid for the static pressure bearings. CONSTITUTION:The pressurized liquid injection holes 19a and 19b of the static pressure bearings 18a and 18b communicate to the intermediate pressure chamber 7 in a balance disc part. A portion of the discharged water leaks into a low pressure chamber 8 through the balance disc intermediate pressure chamber 7. A portion of the liquid which leaks from the balance disc is supplied into the static pressure bearings 18a and 18b through a communication passage 30 by the pressure difference between the intermediate pressure chamber 7 an the pressure chamber 8. Therefore, the need of supplying the discharged liquid into the static pressure bearing part is avoided, and the pumping-up efficiency can be improved.

7. 发明专利

JPS627433B2 失效
公开(公告)号：JPS627433B2
公开(公告)日：1987-02-17
申请号：JP8510480
申请日：1980-06-25
申请人： HITACHI LTD
发明人： MIZUMOTO MUNEO , MISUMI YOJI
IPC分类号： F16J15/44

8. 发明专利

JPH06307951A PRODUCTION OF BOURDON TUBE 失效
公开(公告)号：JPH06307951A
公开(公告)日：1994-11-04
申请号：JP9961393
申请日：1993-04-26
申请人： HITACHI LTD
发明人： HAYASHI MAKOTO , HAYASHI YOJIRO , MISUMI YOJI , ENOMOTO KUNIO
IPC分类号： G01L7/04
摘要： PURPOSE:To provide a manufacturing method of a Bourdon tube for Bourdon tube type pressure gauge being installed in a thermal power station, a nuclear power station, a chemical plant, etc., handling high pressure fluid in which fatigue fracture due to pulsation of pressure is prevented. CONSTITUTION:During the production stage of the material 8 for Bourdon tube, flaws on the inner surface are removed by means of a reamer 18 or a grinding wheel 19 after drawing or flaws on the inner surface are inspected by processing the optical microscopic observation image thus producing a Broudon tube only of a material within allowable flaw dimension. In a Broudon tube made only of such material, fatigue fracture due to pulsation of pressure can be prevented.

9. 发明专利

JPH06235389A SECTIONAL TYPE MULTISTAGE WATER FEEDING PUMP 失效
公开(公告)号：JPH06235389A
公开(公告)日：1994-08-23
申请号：JP2237893
申请日：1993-02-10
申请人： HITACHI LTD
发明人： MORINAGA TAKAYUKI , MISUMI YOJI
IPC分类号： F04D1/08
摘要： PURPOSE:To facilitate assembly and disassembly, reduce the dimension of a pump, and improve sealing performance, by forming a groove in a fitted part between the stage in each stage and the stage in the preceding stage and joining the stage in each stage through the fitting with the groove part. CONSTITUTION:As for a pump main body, a flow passage leading from the initial stage to the final stage is formed from an impeller 1, stage 2, and a diffuser 3. Further, a rotary shaft 5 is supported by a bearing 6, and a balance drum 7 is arranged in order to generate the revolution balance of the rotary shaft 5. In this case, a groove is formed at the fitting part between the stage 2 in each stage and the stage 2 in the preceding stage. The stage 2 in each stage is fitted into and joined to the groove part. Accordingly, the stage 2 in each stage is supported by the stage 2 in the preceding stage, and the necessary thickness for holding the high pressure water which flows in the stage 2 is reduced. Further, sealing performance is provided by nipping a sealing member into each groove.

10. 发明专利

JPH02268964A WEAR RESISTING PUMP PARTS AND ITS MANUFACTURE 失效
公开(公告)号：JPH02268964A
公开(公告)日：1990-11-02
申请号：JP9072289
申请日：1989-04-12
申请人： HITACHI LTD
发明人： NATORI TATSUO , YAMADA TOSHIHIRO , MISUMI YOJI , KAMATA KUNIO , HOSHI TAKEHIKO
IPC分类号： B22D27/18 , B22D27/20 , B22F7/04 , C23C30/00
摘要： PURPOSE:To easily obtain a common cast iron article having a special surface characteristic by dispersing CrC2 particles to only a prescribed part of a surface layer. CONSTITUTION:In the upper part of an inner wall of a cavity 4 of an inorganic self-hardening mold of two-division, a prescribed quantity of a PVA aqueous solution (PVA of prescribed concentration) is mixed uniformly in a prescribed quantity of high carbon Fe-Cr powder (Cr of prescribed concentration). This mixture is rammed to prescribed thickness, and thereafter, dried, and a formed body is hardened. Thereafter, an ordinary cast steel molten metal 6 of a prescribed temperature is injected through a gate part 9 from the top part of a mold 3. When the mold 3 is removed after the molten metal 6 is solidified, high hardness parts (wear resistance parts) in which CrC3 particles are dispersed in a part of prescribed thickness under the surface of castings can be obtained. In a cross section layer of a metallic structure, the surface layer consists of a high hardness structure 5, and other part consists of an ordinary iron alloy as a base metal 8.

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