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1. 发明专利

JPH10259822A BEARING 失效
公开(公告)号：JPH10259822A
公开(公告)日：1998-09-29
申请号：JP6661197
申请日：1997-03-19
申请人： HITACHI LTD
发明人： AKIBA HIDEKI , KIMURA JINJI
IPC分类号： F16C33/24 , F16C27/06
摘要： PROBLEM TO BE SOLVED: To sufficiently prevent the partial wear of a bearing and sufficiently improve durability. SOLUTION: A bearing 100 has a sliding bearing 6 made of ceramics and rotatably supporting a rotary shaft 8, a metallic bearing shell 5 in which the sliding bearing 6 is press-fitted, and a buffer means 10 mounted on the outer periphery of the bearing shell 5. The buffer means 10 is made of, for example, rubber and is provided with a buffering elastic body 2 as a first buffer member for holding the beating shell 5 on the inner peripheral surface and a cylindrical metallic buffer member shell 1 as a second buffer member. In the buffering elastic body 2, thickness t2e in the radial direction at the both ends in the axial direction is larger than thickness t2m in the radial direction at the middle in the axial direction. In the shell 1, thickness t1e in the radial direction at the both ends in the axial direction is smaller than thickness t1m in the radial direction at the middle in the axial direction. Therefore, rigidity in the radial direction at the both ends in the axial direction of the buffer means 10 is smaller than the rigidity in the radial direction at the middle in the axial direction.

2. 发明专利

JPH08296587A PUMP 失效
公开(公告)号：JPH08296587A
公开(公告)日：1996-11-12
申请号：JP9924995
申请日：1995-04-25
申请人： HITACHI LTD
发明人： FUJII TAKUYA , KIMURA JINJI
IPC分类号： F04D29/12 , F04C27/00
摘要： PURPOSE: To depressurize a shaft seal part so as to improve sealing effect, and discharge foreign matter and air simultaneously with water extraction so as to be prevented from being mixed into the shaft seal part by extracting water from a decompression chamber provided rather on the pump interior side than a shaft sealing device. CONSTITUTION: A decompression chamber 1 is provided rather on the pump interior side than a shaft seal part 3 in a no-water injection type shaft sealing device, and water is extracted from the decompression chamber 1 by a water extraction pipe 2, so that the interior of the decompression chamber 1 is decompressed to facilitate shaft seal. At this time, water extracting effect can be improved by forming the decompression chamber 1 in volute structure. In addition, a rotary ring 7 is provided on the rotor side, and centrifugal force by the rotor is used to facilitate water extraction and the discharge of foreign matter and air. Further effect can be obtained by forming the rotary ring 7 into a screw type, and the worsening of water permeability of packing caused by the intermixture of air can be prevented.

3. 发明专利

JP2002161344A SEAWATER-CORROSION RESISTANT AUSTENITIC CAST STAINLESS- STEEL AND PUMP FOR SEAWATER 审中-公开
公开(公告)号：JP2002161344A
公开(公告)日：2002-06-04
申请号：JP2001308148
申请日：2001-10-04
申请人： HITACHI LTD
发明人： KATO TOMOYA , YOKOSUKA TSUNENOBU , HONDA TAKU , KIMURA JINJI
IPC分类号： C22C38/00 , C22C38/40
摘要： PROBLEM TO BE SOLVED: To provide a seawater-corrosion resistant austenitic cast stainless-steel having superior pitting corrosion resistance, a manufacturing method therefor, and a pump for seawater using the steel. SOLUTION: The austenitic cast stainless steel comprises a δferrite phase of 6 vol.% or more, or a cleanliness level of 0.1% or less. The pump for seawater comprises using the material for its casing and/or casing liner.

4. 发明专利

JPH07133798A IMPELLER OF MIXED FLOW PUMP 失效
公开(公告)号：JPH07133798A
公开(公告)日：1995-05-23
申请号：JP27928693
申请日：1993-11-09
申请人： HITACHI LTD
发明人： OKAMURA TOMOYOSHI , SUDO SUMIO , KIMURA JINJI , TERAJIMA MAKOTO
IPC分类号： F04D3/02 , F04D11/00 , F04D29/18
摘要： PURPOSE:To always develop secondary flow or separation in a partial flow territory so as to provide a stable pump head-flow characteristic downward right by providing projecting parts of small radius of curvature of angle on the negative pressure face of the leading edge of the blade of a movable blade impeller. CONSTITUTION:When projecting parts are provided on a movable blade impeller 1, the radius of curvature of the angle on the negative pressure face side of the projecting leading edge is set to be small, so that flow is always separated at the same position of the angle of a leading edge in a partial flow territory even if the blade fitting angle is changed. For example the leading edge of a blade 2 is provided with plate-like ribs 5 of less height than the maximum thickness of the blade instead of a solid projection as a projecting part. The rib 5 of one of several pieces are provided along the leading edge on optional positions of the leading edge part. Because the angle 5a of the rib is formed acute, it is suitable for the movable blade impeller 1 in particular. Hereby against an existing impeller having unstable part in the pump head-flow characteristic (Q-H characteristic), it is suitable for correction stabilizing the Q-H characteristic by additional working.

5. 发明专利

JPH0735085A MOVABLE VANE PUMP 失效
公开(公告)号：JPH0735085A
公开(公告)日：1995-02-03
申请号：JP17961893
申请日：1993-07-21
申请人： HITACHI LTD
发明人： OKAMURA TOMOYOSHI , TAKEURA MASAHIRO , KIMURA JINJI
IPC分类号： F04D11/00 , F04D13/00
摘要： PURPOSE:To restrain the instability of Q-H characteristic (quantity of discharge/ net pump head) resulting from a sudden, substantial separation by installing the pump-suction-side outlet of a balance pipe on the inner surface of a suction casing immediately in front of an impeller. CONSTITUTION:Water that is guided to the outside from behind an impeller 1 via a balance pipe 7 provided inside the thick-blade portion of a diffuser 2 is allowed to flow through a balance pipe 8, a header 9 provided around the outer peripheral portion of a suction casing 3, and a nozzle 10, and is ejected immediately in front of the impeller 1. As a result, a uniform radial distribution of meridional flow rate can be made and a stable pump characteristic can be obtained without instability in Q-H characteristic. Also, since the angle at which a fluid flowing out of the balance pipe 7 collides with a main flow is made smaller, pump efficiency can be enhanced.

6. 发明专利

JPH08200287A MOVABLE BLADE STRUCTURE FOR SEAWATER PUMP AND SEAWATER PUMP AND SEAL STRUCTURE THEREOF 失效
公开(公告)号：JPH08200287A
公开(公告)日：1996-08-06
申请号：JP1365495
申请日：1995-01-31
申请人： HITACHI LTD
发明人： OKADA RYOJI , KIMURA JINJI , TERAJIMA MAKOTO , UEYAMA TOSHIHARU
IPC分类号： F04D29/12 , F04D29/18
摘要： PURPOSE: To provide a movable blade structure for a seawater pump preventing a seawater leak without generating crevice corrosion in a shaft part of a blade slid against a V packing in a bearing side. CONSTITUTION: In a seawater pump in which a movable blade 4 mounted in an impeller hub 3 mounted in the point end of a rotary drive shaft is formed of a blade 4a and a shaft 4b, to fit the shaft 4b into a V packing in a bearing part of the impeller hub 3 turned by a blade drive mechanism provided in the impeller hub 3, so as to change a surface angle of the blade against a flow of water, the shaft 4b, providing a step difference successively from the first shaft part connected to the blade 4a, is constituted of the second/third shaft parts of thin diameter. A peripheral part of the second shaft part is constituted of a sleeve 6 made of high anticorrosive 25 to 30% Cr-3 to 5% Mo-Fe alloy, to slide the sleeve between itself and the V packing, and a rubber sheet 9 fixed by a bonding agent is interposed between one end surface of the sleeve 6 and a step differenced surface of the first shaft part, to press the other end surface of the sleeve 6 supported by a retainer plate 7 mounted in a step differenced surface of the second shaft part.

7. 发明专利

JPH08200286A MOVABLE BLADE PUMP 失效
公开(公告)号：JPH08200286A
公开(公告)日：1996-08-06
申请号：JP875995
申请日：1995-01-24
申请人： HITACHI LTD
发明人： OKAMURA TOMOYOSHI , YAZAWA SETSUO , TERAJIMA MAKOTO , TAKEURA MASAHIRO , KIMURA JINJI
IPC分类号： F04D29/18
摘要： PURPOSE: To attain sufficient stabilization of a Q-H characteristic by providing a blade angle adjusting mechanism giving at least two kinds of blade angles at least partly in a part of a blade angle variable range relating to a plurality of the blades, in a variable blade pump having an impeller provided with a plurality of the blades with a blade angle variable. CONSTITUTION: A movable blade mixed flow pump 100 has a rod 5 displaceable in an axial direction arranged in a hollow pump drive shaft. The pump has a hub 1A formed with an external surface partly as a ball to be fixed to the pump drive shaft and an impeller 1 provided rotatably in this hub 1A to have blades 1a to 1c with a blade angle variable. By displacing the rod 5 in the axial direction, the blade angle is changed through a ball joint 6a and an arm 7a. Here by setting lengths m1a to m1c of the ball joints 6a to 6c to m1b >m1a > m1c and lengths m2a to m2c of the arms 7a to 7c to m2a =m2b =m2c , a blade angle ϕa to ϕc of each blade obtains a relation where ϕb >ϕa >ϕc .

8. 发明专利

JPH07217599A MOVABLE VANE MIXED FLOW PUMP 失效
公开(公告)号：JPH07217599A
公开(公告)日：1995-08-15
申请号：JP1029694
申请日：1994-02-01
申请人： HITACHI LTD
发明人： OKAMURA TOMOYOSHI , KIMURA JINJI , TERAJIMA MAKOTO
IPC分类号： F04D29/38 , F04D29/56
摘要： PURPOSE:To provide stable characteristics at all blade angles by a method wherein a gap size between the tip of the blade shroud of a movable vane impeller and a casing liner and a gap size between the tip of a blade hub and an impeller hub are variable according to a blade angle. CONSTITUTION:In a movable vane mixed flow pump wherein the blade 1a of an impeller 1 is set to an arbitrary blade angle by a moving mechanism 3a, a mechanism 6 to axially move a casing liner 5 is arranged at the outer flange of a diffuser 2 positioned facing the flange of the casing liner 5. The moving mechanism 6 has a feed screw rotated by a control motor and the feed screw is joined in a screwed-in state with a female screw formed in a flange on the liner 5 side, and the liner 5 is axially moved by the faucet part thereof serving as a guide. A control motor 6a is controlled by a controller based on a pressure signal from a pump delivery pressure detector 8 and a blade angle signal generated by a blade operation mechanism.

9. 发明专利

JPH05288192A 失效
公开(公告)号：JPH05288192A
公开(公告)日：1993-11-02
申请号：JP8362292
申请日：1992-04-06
申请人： HITACHI LTD
发明人： KIMURA JINJI
IPC分类号： F04D29/08 , F04D29/36
摘要： PURPOSE:To prevent the lowering of sealing performance caused by the corrosion of an impeller vane and facilitate a countermeasure in the case of corrosion being developed by making the sealing direction of the impeller vane and packing the same as the axial direction of a vane. CONSTITUTION:The impeller vane 1 of a movable vane vertical shaft pump is fitted to an impeller hub 2, and the vane angle of the vane 1 is changed according to the operating state of the pump. An I-packing 3 is put between the sliding parts of the vane 1 and hub 2 so as to prevent the infiltration of seal water into the hub 2. Because of being expanded in the axial direction of the vane 1, the I-packing 3 is expanded even in the case of the sliding face of the vane 1 being corroded, so that sealing performance is not lowered. In the case of the corrosion of the impeller vane 1 being advanced, the corrosion part is removed by machining up to the position graduated previously on the vane 1, and the I-packing 3 is replaced with the one higher in height by one stage. The sealing performance can be thereby recovered to the same degree as the initial state.

10. 发明专利

JP2015052273A 立軸ポンプ用軸受装置及び立軸ポンプ有权
标题翻译：用于垂直轴泵和垂直轴泵的轴承装置
公开(公告)号：JP2015052273A
公开(公告)日：2015-03-19
申请号：JP2013183843
申请日：2013-09-05
申请人：株式会社日立製作所 , Hitachi Ltd
发明人： MITSUHASHI YUKI , KIMURA JINJI
IPC分类号： F04D29/046 , F04D13/00
摘要：【課題】空転運転時に、軸受とスリーブが摺動することによって発生する摩擦熱で軸受およびスリーブが膨張し、クリアランスが狭くなり抱きつくことを長時間にわたり防止する。【解決手段】揚水を潤滑液とし立軸ポンプの主軸を回転支持する立軸ポンプ用軸受装置において、主軸の外周面に対向して配置される軸受摺動部材と、この軸受摺動部材を保持する軸受ケースを有し、軸受摺動部材は金属製であるとともに軸受ケースに固定されており、軸受摺動部材の外周側と前記軸受ケースの内周側との間に隙間を設けたことを特徴とする。前記隙間は、前記軸受摺動部材の外周側と前記軸受ケースの内周側の間に環状に形成されたことを特徴とする。【選択図】図2
摘要翻译：要解决的问题：为了防止轴承和套筒在延长的时间内通过减小轴承和套筒之间的间隙而相互附着，这是由于轴承和套筒由于由在空转运转期间，在轴承和套筒之间滑动。解决方案：一种垂直轴泵的轴承装置，其使用抽水作为润滑液体可旋转地支撑竖轴泵的主轴，包括：轴承滑动构件，其布置成面向主轴的外周面; 以及用于保持轴承滑动构件的轴承箱，其中所述轴承滑动构件由金属制成并固定到所述轴承箱; 在轴承滑动构件的外周侧和轴承箱的内周侧之间设置间隙; 并且在轴承滑动部件的外周侧与轴承箱的内周侧之间形成有间隙。

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