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81. 发明专利

JPH11201098A TWO-STAGE CENTRIFUGAL COMPRESSOR 失效
公开(公告)号：JPH11201098A
公开(公告)日：1999-07-27
申请号：JP446598
申请日：1998-01-13
申请人： HITACHI LTD
发明人： FUKUSHIMA YASUO , MIURA HARUO , NISHIDA HIDEO , TAKAHASHI NAOHIKO , TAKAHASHI KAZUKI
IPC分类号： F04D17/12 , F04B39/06 , F04D13/06 , F04D29/04 , F04D29/58
摘要： PROBLEM TO BE SOLVED: To provide a maintenance-free turbo compressor of a compact structure without using cooling water. SOLUTION: A rotor part of a high frequency motor 1 is formed at a center of a rotor 2, a low pressure stage runner 6 and a high pressure stage runner 7 are installed on both axial end parts of the rotor 2 to compose a multi-stage centrifugal compressor, and this rotor 2 is contactlessly held by radial electromagnetic shaft bearings 3, 4 and a thrust electromagnetic shaft bearing 5. The motor 1 is air-cooled, gas discharged from the low pressure stage and the high pressure stage is heat-exchanged with cooling medium liquid by an intermediate cooler 11 and a discharge cooler 12. Cooling medium liquid flowing through both coolers 11, 12 is heat-exchanged with outer air by a radiator 18. A fan 20 is provided close to the radiator 18, and part of outer air sucked by the fan is used for cooling the motor.

82. 发明专利

JPH11125340A SHAFT SEALING DEVICE OF TURBO MACHINE 失效
公开(公告)号：JPH11125340A
公开(公告)日：1999-05-11
申请号：JP29210197
申请日：1997-10-24
申请人： HITACHI LTD
发明人： ISHII EIJI , MIURA HARUO
IPC分类号： F16J15/44 , F16J15/447
摘要： PROBLEM TO BE SOLVED: To prevent shaft vibration by uniformizing the pressure in the circumferential direction of an annular gap by providing a circumferential communicating space on the inside in the radial direction of a rotating part corresponding to the annular space, and communicating the space with the annular gap by a through hole bored in the rotating part. SOLUTION: A fluid enters from the shaft sealing inlet pressure P1 side of an annular gap 15 to go out to the shaft sealing outlet pressure P2 side. A circumferential communicating space 19 is provided inside a sleeve 14 and allowed to communicate with the annular gap 15 by a through hole 18 in the surface of the sleeve 14. As the space 19 is rotated with the rotating shaft, a circumferential current is generated in the interior. The unstable vibration of the shaft is generated because the width of the annular space 15 changes in the circumferential direction due to whirling of the rotating shaft 12 so that the circumferential pressure distribution becomes non-uniform. A fluid is enabled to go in and out between the annular space 15 and the space 19 through the through hole 18 efficiently by utilizing the circumferential current in the space 19, whereby the circumferential pressure distribution can be made uniform. The unstable vibration of the rotating shaft can be prevented.

83. 发明专利

JPH1198728A PERMANENT MAGNET DYNAMO-ELECTRIC MACHINE 失效
公开(公告)号：JPH1198728A
公开(公告)日：1999-04-09
申请号：JP26772797
申请日：1997-09-12
申请人： HITACHI LTD
发明人： TAJIMA FUMIO , MATSUNOBU YUTAKA , SUGAI HIROSHI , MIURA HARUO
IPC分类号： H02K1/16 , H02K1/27 , H02K15/03 , H02K21/14
摘要： PROBLEM TO BE SOLVED: To provide a permanent magnet dynamo-electric machine which is high in rotation efficiency by enabling downsizing, and also suppresses eddy currents. SOLUTION: This permanent magnet dynamo-electric machine possesses a stator 2, which comprises a stator winding 5 and a stator iron core 4 equipped with a slot part 43 having a stator winding and used for accommodation of the stator winding, a stator tooth 41 generating magnetic circuit, and a stator yoke part 42, and a rotor 3, which comprises a rotor iron core 8, a permanent magnet 6 arranged in circular form around it, and a permanent magnet retaining member 7, arranged around the permanent magnet and used for retaining the permanent magnet. In this case, it is made such that hs

84. 发明专利

JPH1113688A LABYRINTH SEAL DEVICE AND FLUID MACHINE HAVING THE DEVICE 失效
公开(公告)号：JPH1113688A
公开(公告)日：1999-01-19
申请号：JP16561797
申请日：1997-06-23
申请人： HITACHI LTD
发明人： KOBAYASHI HIROMI , NISHIDA HIDEO , MIURA HARUO , SAKAENO TAKASHI , TAKAHASHI KAZUKI
IPC分类号： F04D29/10 , F04D29/16 , F16J15/447
摘要： PROBLEM TO BE SOLVED: To operate a labyrinth device and a fluid machine using the device with stable seal performance for a long period. SOLUTION: A centrifugal type fluid machine uses a labyrinth seal for a non-contact seal. Labyrinth fins 2a-2d are formed in a plurality of stages at either the rotation shaft 1 side or the static side containing an inner casing 3, and gap-making work coating 4 is applied on an inner casing 3 positioned facing the labyrinth fins 2c and 2d thereof. Meanwhile, the tip gap δ2 of the inner casing 3 part positioned facing labyrinth fins 2a and 2b is increased in size to a value higher than the tip gap δ1 between the fins 2c and 2d positioned facing the coating 4. This constitution performs, the fins 2a and 2b at a front stage effect labyrinth operation.

85. 发明专利

JPH10252681A TURBO COMPRESSOR 失效
公开(公告)号：JPH10252681A
公开(公告)日：1998-09-22
申请号：JP5904497
申请日：1997-03-13
申请人： HITACHI LTD
发明人： MIURA HARUO , TAKAHASHI KAZUKI , NISHIDA HIDEO , TAKAHASHI NAOHIKO
IPC分类号： F04D17/10 , F04D29/42 , H02K7/14
摘要： PROBLEM TO BE SOLVED: To compact a turbo compressor and to provide structure where an assembly and disassembly work is facilitated. SOLUTION: A turbo compressor is formed such that a motor case 8 to contain a motor 1 forms integral structure in a peripheral direction, a low pressure stage case containing an impeller 6 is divided into upper and lower cases 13a and 13b, and a high pressure stage case containing an impeller 7 is divided into upper and lower cases 14a and 14b. Both the lower cases 13b and 14b are formed integrally with the motor case 8, and also structured integrally with a cooler case 15. Meanwhile, the upper cases 13a and 14b are removablly mounted and during assembly and disassembly, with the upper case removed, a work is executed.

86. 发明专利

JPH09144691A TURBO-COMPRESSOR 失效
公开(公告)号：JPH09144691A
公开(公告)日：1997-06-03
申请号：JP30547695
申请日：1995-11-24
申请人： HITACHI LTD
发明人： MIURA HARUO , HIROSHIMA MINORU , TAKAHASHI NAOHIKO
IPC分类号： F04D29/056 , F04D17/10 , F04D29/04 , F04D29/058 , F16C32/04
摘要： PROBLEM TO BE SOLVED: To form a thrust bearing in a ring structure, facilitate disassembly/ assembly, and improve rotor stiffness by enlarging the inner diameter of a thrust magnetic bearing more than the outer shape of a high speed motor rotor part, in a high speed motor turbo-compressor supported by a magnetic bearing. SOLUTION: A rotor 2 which impellers 12, 13 are arranged on both end driven by a high speed motor in a turbo-compressor, is supported by radial magnetic bearings 3, 4 and a thrust magnetic bearing. The thrust bearing is arranged in the vicinity of the motor, and it is arranged on the inside of the radial bearings 3, 4, and a thrust bearing collar 11 is arranged integratedly with the rotor 2. In the thrust bearing, the inner diameter thereof is formed larger than the outer shape of a motor rotor, and also an inner thrust bearing 10a is formed in a ring structure. The inner thrust bearing 10a is installed on a motor side surface, and the rotor 2 is assembled from an axial direction so as to improve the stiffness of the rotor 2.

87. 发明专利

JPH06288398A CENTRIFUGAL COMPRESSOR 失效
公开(公告)号：JPH06288398A
公开(公告)日：1994-10-11
申请号：JP8035293
申请日：1993-04-07
申请人： HITACHI LTD
发明人： NISHIDA HIDEO , KOBAYASHI HIROMI , MIURA HARUO , TANAKA TEIJI
IPC分类号： F04D29/44 , F04D29/66
摘要： PURPOSE:To improve performance and reduce noise by constituting guide vanes from two kinds of guide vanes equal in front edge radius and different in length, arranging the short guide vane between the adjacent long guide vanes, and setting the total number of guide vanes larger than the vane number of an impeller. CONSTITUTION:A pair of diffusers 4 and a diffuser with vanes consisting of too kinds of guide vanes 5, 6 different in length arranged between them in circular wing line form are set in the radial outside of a centrifugal impeller 2 fixed to a rotating shaft. One guide vane 5 is set longer than the other guide vane 6, and the total number of both the guide vanes 5, 6 is set larger than the vane number of the impeller 2. Both the guide vanes 5, 6 are alternately arranged in the circumferential direction, and the respective front edge radiuses ra are set equal to each other. Further, among two passages between both the adjacent guide vanes 5, 6, a throat 10 is formed on only one. Thus, a high performance centrifugal compressor having a wide operation range and low noise can be provided.

88. 发明专利

JPH04159497A FLUID MACHINE 失效
公开(公告)号：JPH04159497A
公开(公告)日：1992-06-02
申请号：JP27901990
申请日：1990-10-19
申请人： HITACHI LTD
发明人： MIURA HARUO
IPC分类号： F04D29/10 , F04D29/66
摘要： PURPOSE:To give stability characteristics to a labyrinth part by an easy method with a small energy loss by providing a plurality of ribs in a radial directional space between a core plate of an impeller and a stationary wall surface from a stationary wall surface side, and further shifting an internal diametric side point end position of the rib in an opposite direction to a rotational direction of the impeller. CONSTITUTION:In a fluid machine, for instance, compressor, a labyrinth 13 is provided between a final stage impeller 2a of a low pressure stage group and a final stage impeller 2b of a high pressure stage group. Here, a stationary wall 14b, corresponding to an external diameter of the impeller 2b, is extended in an axial direction to provide a space 23. A ring 21, having a rib 22, is mounted to the inside of the space 23. An internal diametric side outlet rear end is shifted in a reverse direction to a rotational direction relating to an external diametric side inlet point end, in the rib 22. In this way, a turning component of flow leakage in a balance labyrinth inlet is set to a reverse direction to the rotation thus to eliminate that a balance labyrinth part acts so as to make shaft vibration unstable.

89. 发明专利

JPH0311199A MIXED FLOW COMPRESSOR 失效
公开(公告)号：JPH0311199A
公开(公告)日：1991-01-18
申请号：JP14538489
申请日：1989-06-09
申请人： HITACHI LTD
发明人： NISHIDA HIDEO , KOBAYASHI HIROMI , MIURA HARUO
IPC分类号： F04D23/00 , F04D29/44
摘要： PURPOSE:To enhance the performance of compressors by forming a guide channel which introduces liquid in a chamber formed by depressing the surface of a channel on the side of a side plate at the bend of a diffuser inlet, into a suction pipe. CONSTITUTION:After a flow is sucked into a mixed flow impeller 1 from a suction pipe 8 and boosted, it is slowed down by a diffuser 6 and led into a casing 7. Since the curvature of the meridional channel of the mixed flow impeller 1 is small, the flow becomes nearly uniform in the cross direction at the outlet of the impeller. The flow came out from the impeller 1 and entered the diffuser 6 is drawn nearer toward the side of a center plate due to the small curvature radius of the bend at the diffuser 6 inlet, and the flow velocity on the side plate side tends to become small. However, a chamber 9 is located at the inlet part of the diffuser 6, and the fluid inside the high pressurized chamber 9 is flown into a suction pipe 8 through a guide channel 10, so that the flow with a low flow velocity on the side plate side is sucked into the chamber 9. As a consequence, the flow at the diffuser's bend terminating part 6b becomes uniform in the cross direction to substantially improve the diffuser performance, i.e., the performance of the mixed flow compressor.

90. 发明专利

JPH02130298A CENTRIFUGAL COMPRESSOR 失效
公开(公告)号：JPH02130298A
公开(公告)日：1990-05-18
申请号：JP28362588
申请日：1988-11-11
申请人： HITACHI LTD
发明人： MIURA HARUO
IPC分类号： F04D29/16 , F04D29/44
摘要： PURPOSE:To prevent the disturbance of the inlet flow at the inlet of a vane wheel by installing a fluid passage from a seal mechanism installed between the vane wheel and a stator part opposed to the side plate of a plurality of vane wheels to the inside of a return channel or the inlet part of the return channel through the stator part. CONSTITUTION:A vane wheel 1 having a side plate 1a is installed onto the rotary shaft 2 of a single axis multistage centrifugal compressor. A return channel 7 is formed by a diaphragm 4 engaged with a casing 5 and a stator part. A labyrinth 8 is installed between the side plate 1a and the diaphragm 4, and an introducing hole 9 is formed between the fins 8a and 8b of the labyrinth 8, and communicates to the inlet part of the return channel 7 through a communication hole 11 and a communication groove 13. Since the leaking fluid (shown by the arrow) which directs from the outlet of the vane wheel to the inlet and a slight portion (shown by the arrow) of the flow at the inlet part of the vane wheel are introduced into the return channel from the center part of the labyrinth through the introducing hole, the stream at the inlet of the vane wheel is not disturbed, and a boundary layer can be removed, and the inside efficiency of the vane wheel can be improved.

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