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1. 发明专利

JPH09303297A FLOW CONTROLLER FOR CENTRIFUGAL COMPRESSOR OR CENTRIFUGAL BLOWER 失效
公开(公告)号：JPH09303297A
公开(公告)日：1997-11-25
申请号：JP12346496
申请日：1996-05-17
申请人： HITACHI LTD
发明人： NAKAGAWA KOJI , TERASAKI MASATOSHI , KEMI YUICHI , URAKI YASUO , KUWABARA KENICHI
IPC分类号： F04D27/00 , F04D29/46
摘要： PROBLEM TO BE SOLVED: To reduce energy loss, noise and vibration in time of the small flow operation of a centrifugal compressor or centrifugal blower by a suction damper through a simple structure. SOLUTION: Two flow regulating plates 6A and 6B being rotatable in the reverse direction with each other are installed in a suction passage installed upstream in an impeller eye, while this suction passage is halved by a flow regulating plate or split plate 7 locked to this suction passage, whereby a swirl flow is produced upstream in an impeller in an intermediate opening state of these flow regulating plates 6A and 6B. With this constitution, as compared with a suction damper having one movable flow regulating plate at the upstream side of the impeller eye, noise and vibration attributable to watt consumption in time of small flow operation and an ununiformed flow are sharply reducible.

2. 发明专利

JP2573292B2 失效
公开(公告)号：JP2573292B2
公开(公告)日：1997-01-22
申请号：JP7414788
申请日：1988-03-28
申请人： HITACHI LTD
发明人： NAKAGAWA KOJI , TAKAGI TAKEO , KANEKO JUNICHI , ABE YOSHIAKI , SAKAI HARUKI
IPC分类号： F04D29/44

3. 发明专利

JPH08296598A FAN 失效
公开(公告)号：JPH08296598A
公开(公告)日：1996-11-12
申请号：JP9924695
申请日：1995-04-25
申请人： HITACHI LTD
发明人： SHINTANI TAKASHI , NAGANO TSUKASA , TAKATSU YASUSHI , NAKAGAWA KOJI
IPC分类号： F04D29/00 , F04D19/02 , F04D29/66
摘要： PURPOSE: To reduce noise without influencing the performance of a fan by providing sound absorbing structure at a member or a protruding structure provided at the fluid passage face of a suction casing, a suction duct or a suction passage pipe. CONSTITUTION: Sound absorbing material 31 or sound insulating material and a protecting member 41 are fitted, in shape with fluid flow taken in account, to a member, a protruding structure, a stream lining plate 10 or a vane provided at the fluid passage face of a fan suction casing 1, a suction duct or a suction passage pipe. With noise reducing effect thus provided, the fan suction casing 1 is formed into noise reducing structure so as not to influence the performance of a fan, and noise can be reduced in a place as close as possible to the generated place of interference noise generated by a rotor blade, a stator blade, members, and the like and noise generated by vortex flow caused by the change or the like of fluid passage area and a passage.

4. 发明专利

JPH05337064A 失效
公开(公告)号：JPH05337064A
公开(公告)日：1993-12-21
申请号：JP14533492
申请日：1992-06-05
申请人： HITACHI LTD
发明人： SATO SHIGENORI , YAMAZAKI SUSUMU , NAKAGAWA KOJI , SUNAKAWA MASARO , MIKAMI KATSUMASA
IPC分类号： A47L9/04
摘要： PURPOSE:To improve the torque characteristic of an air turbine without generating the uncomfortable air current sound by setting the diameter of both end face wall sides of the air turbine smaller than the diameter of the center section of the air turbine. CONSTITUTION:A runner 4R and a runner 4L have eight adjacent right and left blades respectively, they are staggeringly arranged in turn, the end face wall 19R of the runner 4R and the end face wall 19L of the runner 4L have a curvature at the center section, the diameter of the end face walls 19R, 19L is made smaller than the diameter of the center section of a turbine 4, and the outer periphery side faces 44R, 44L of the runners 4R, 4L are inclined. The sucked air current collides with the runners 4R, 4L of the turbine 4 after passing through a nozzle 30 then flows toward the outer periphery of the turbine 4 along the curvature of the center section of the end face walls 19R, 19L. A sufficient air quantity can be secured for the sucked air current to flow between the runners 4R, 4L, and the torque is not reduced. The air current colliding with the end face walls 19R, 19L is mitigated, and the noises generated when the air current is disturbed are reduced.

5. 发明专利

JPH05202824A ELECTROMAGNETIC FUEL INJECTION VALVE AND COMBINED AIR-INTAKE TYPE ENGINE USING THE SAME 失效
公开(公告)号：JPH05202824A
公开(公告)日：1993-08-10
申请号：JP1472792
申请日：1992-01-30
申请人： HITACHI LTD
发明人： OKAMOTO YOSHIO , KANAMARU NAONOBU , MAEDA HARUTOSHI , SUZUKI SATOSHI , ISHIKAWA TORU , KOSUGE TOKUO , AMO KIYOSHI , OKI HIROSHI , NAKAGAWA KOJI , TANABE YOSHIYUKI , YOKOYAMA MIZUHO
IPC分类号： F02M51/06 , F02M51/08 , F02M61/18 , F02M69/00
摘要： PURPOSE:To provide an electromagnetic fuel injection valve which may effectively distribute sprayed fuel from a fuel injection hole and which has a valve structure facilitates the machining of a nozzle part. CONSTITUTION:A spherical body attached to the front end part of a ball valve 10 is movably held in a fuel swivel element 18 which exerts swirl force to fuel. Further, a fuel injection hole 13 is formed in the valve shaft part of a valve guide 11 having a seat surface 12 which cooperates with the ball valve 10 so as to measure the fuel. Further, a protrusion 1 is provided coaxially with the fuel injection hole 13 in the valve guide 11, downstream of the fuel injection hole 13.

6. 发明专利

JPH04203779A ARTIFICIAL SNOW FALLING DEVICE 失效
公开(公告)号：JPH04203779A
公开(公告)日：1992-07-24
申请号：JP32912890
申请日：1990-11-30
申请人： HITACHI LTD , TOYOTA MOTOR CORP
发明人： ISODA YUKIO , FUNATO KENICHIRO , HAGIWARA TERUAKI , NAKAGAWA KOJI , YOSHIHIRO WAHEI , MORI AKIO , KUNIEDA HIROMI
IPC分类号： F25C3/04
摘要： PURPOSE:To make a uniform distribution of blown snow concentration in a vertical direction at a nozzle blowing port by a method wherein an opening or closing deflector having a plurality of slit-like aeration ports formed in a direction crossing with such a direction as one in which one end of an auxiliary deflector is moved up or down and for making a variable width of each of the aeration ports is installed at a lower part of a snow scraping shooter. CONSTITUTION:As a gear motor 6 is rotated in a direction indicated by an arrow, each of wires 7 is moved in a direction indicated by an arrow. As a result, each of deflectors is moved in the same direction as that of the wire and a deflector 3 is operated in a direction to close. If the gear motor 6 is rotated in a reverse direction, the deflector 3 is moved to open. The auxiliary deflector 4 is operated such that a gear-rack 5 performs a vertical movement with the gear motor 6 and the deflector 3 performs the vertical movement in a slant direction. In this way, it is possible to set a degree of opening of the opening or closing deflector 3 to any optional position, so that even if an amount of blown snow or an air speed is varied, the most appropriate degree of opening is selected to enable a uniform distribution of concentration of blown snow.

7. 发明专利

JPH01247798A HIGH SPEED CENTRIFUGAL COMPRESSOR 失效
公开(公告)号：JPH01247798A
公开(公告)日：1989-10-03
申请号：JP7414788
申请日：1988-03-28
申请人： HITACHI LTD
发明人： NAKAGAWA KOJI , TAKAGI TAKEO , KANEKO JUNICHI , ABE YOSHIAKI , SAKAI HARUKI
IPC分类号： F04D29/44
摘要： PURPOSE:To expand a working range on a small flow side and improve capacity control greatly by a method wherein a side plate of a stator blade of a diffuser is extended from a core plate toward an impeller so that the front rim of the stator blade is formed so that it is tilted from the core plate toward the side plate. CONSTITUTION:A front rim 5 on the side of a side plate of a stator blade 4 of a diffuser is located near an exit of an impeller 1. On the other hand, the front rim on the side of a core plate is located farther than the side plate part 5 from the impeller 1. Though velocity vector is close to a tangential direction 8 of the impeller, it is led toward a direction along the stator blade 4 by the front rim which extends to the vicinity of the impeller 1. Since backstreaming of a flow flowing out of the impeller can be thus controlled, the working range of a compressor on the side of a small flow rate can be expanded and capacity control can be greatly improved.

8. 发明专利

JPS62108124A ENVIRONMENTAL WIND TUNNEL FOR AUTOMOBILE 失效
公开(公告)号：JPS62108124A
公开(公告)日：1987-05-19
申请号：JP24701285
申请日：1985-11-06
申请人： HITACHI LTD
发明人： NAKAGAWA KOJI , KOBAYASHI AKIMINE , FUKAZAWA HIROSHIGE
IPC分类号： G01M9/00 , G01M9/04 , G01M17/00 , G01M17/007
摘要： PURPOSE:To perform wind tunnel tests with a small air-current cross section, by forming the wall surface of a wind tunnel in such a streamline shape that can simulate the running state of a test car or the running state of another test car which is very similar to the first mentioned test car in shape and dimensions. CONSTITUTION:The streamline shape of a curved-surface cover 3 is previously approximated to a streamline 3' which is formed in the course of a wind tunnel test which can accurately simulate the running state of a test car 1 and by flow analysis, etc. Moreover, the shape of the curved surface of the cover 3 is formed so that the curved surface can follow the streamline three-dimensionally. Therefore, a state where the test car 1 is put in a uniform air flow can be realized, even when the cross section of the air flow 2 flowing into a measuring section is almost the same as that of the test car 1. If another test car 1' is similar to the test car 1 in shape and dimensions as shown in the figure, no much difference can be found between the shape of the streamline formed when the test car 1 is put in a uniform air current and the shape of the streamline formed when the test car 1' is put in the uniform air current. Therefore, the curved-surface cover 3 which is manufactured in accordance with the test car 1 can be used for the test car 1'. Accordingly, wind tunnel tests can be carried out with a small air-current cross section.

9. 发明专利

JPS6147999B2 失效
公开(公告)号：JPS6147999B2
公开(公告)日：1986-10-22
申请号：JP20017481
申请日：1981-12-14
申请人： HITACHI LTD
发明人： YOSHINAGA YOICHI , NAKAGAWA KOJI
IPC分类号： F04D29/28 , F04D29/44

10. 发明专利

JPS6045287B2 失效
公开(公告)号：JPS6045287B2
公开(公告)日：1985-10-08
申请号：JP928678
申请日：1978-02-01
申请人： HITACHI LTD
发明人： NAKAGAWA KOJI
IPC分类号： F01D11/08 , F01D1/08 , F01D11/00

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