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1. 发明专利

JPH09250491A SHAFT SEALING DEVICE OF AXIAL FLOW FAN 失效
公开(公告)号：JPH09250491A
公开(公告)日：1997-09-22
申请号：JP5579096
申请日：1996-03-13
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： YOSHIUMI HIROTO , TAKATSU YASUSHI , NARA TAKAHIDE
IPC分类号： F04D29/08 , F04D19/02
摘要： PROBLEM TO BE SOLVED: To prevent oil leakage from a space in a bearing case into an impeller hub or the like by arranging a labyrinth for oil cutting of a bearing lubricating oil facing an impeller shaft in the vicinity of the root of an impeller hub and injecting an sealing air for shaft sealing in the cylinder of the casing between the impeller hub. SOLUTION: A axial flow fan generates wind for a ventilation face 21 by rotation of an impeller shaft 1, an impeller shaft 2, and a rotor blade 3 due to a driving motor, and at this time a bearing metal 4 supplies lubricating oil continuously to the contact face with the shaft 1. The lubricating oil from the bearing metal 4 flows out from the oil discharge port of a bearing case 7, part of which is prone to flow out to a hub 2 and space 23 and a space 23 in an cylinder. To inhibit this, between a space 24 in the bearing case and a ventilation face 21 is shielded with an oil cutting labyrinth 8 and a pressure control packing 6, and the air beyond the atmospheric pressure is flown into the space 23 in the cylinder and leakage of the lubricating oil into the space 23 in the cylinder and the impeller hub 2 is prevented.

2. 发明专利

JP2000211505A AIR CONDITIONING DEVICE AND MOISTURE REMOVING OPERATION METHOD FOR ROLLING STOCK 失效
公开(公告)号：JP2000211505A
公开(公告)日：2000-08-02
申请号：JP1661199
申请日：1999-01-26
申请人： HITACHI LTD
发明人： HIRAKAWA HARUO , KOBAYASHI KENJI , YOSHIUMI HIROTO
IPC分类号： B61D27/00 , B60H3/00 , F24F11/02 , F25B39/02
摘要： PROBLEM TO BE SOLVED: To condense moisture in the air while restraining a temperature decrease in the air in a vehicle so as to prevent occurrence of over-cooling condition by cooling and removing moisture by a lower heat transmission pipe group at moisture removing operation, and controlling the condition of refrigerant by an electric expansion valve so as to generate no cooling effect in an upper heat transmission pipe group. SOLUTION: A lower and an upper heat transmission groups constitute three refrigerant flow passage, and they are connected such that the refrigerant comming from the left side heat transmission pipe flows into the right side heat transmission pipe. The refrigerant comming out of the last heat transmission pipe at the right end among the lower heat transmission pipes is led to the upper and left side heat transmission pipe through a U shaped intermediate header 12, and is made to flow into the right side heat transmission pipe after passing through three flow passages. At moisture removing operation of an air conditioner 1, the lower heat transmission pipe group is reduced in its opening by an electric expansion valve 8 so that the refrigerant has two phases of liquid and gas while the upper heat transmission pipe group is reduced in its opening thereby so that the refrigerant has a gas area. In the two phase area in the lower part pasing air is cooled for removing moisture by evaporation latent heat of liquidous refrigerant while in the gas area in the upper part only the latent heat is cooled but the air is not cooled.

3. 发明专利

JPH0735089A THRUST ADJUSTING DEVICE 失效
公开(公告)号：JPH0735089A
公开(公告)日：1995-02-03
申请号：JP18366693
申请日：1993-07-26
申请人： HITACHI LTD
发明人： FUKUSHIMA YASUO , YOSHIUMI HIROTO , HIROSHIMA MINORU , TAKAHASHI NAOHIKO
IPC分类号： F04D15/00 , F04D17/08
摘要： PURPOSE:To control thrust pressure which is exerted on a shaft end by sealing the portion of a gas passage past a radial bearing main body, and using a valve for adjusting gas which is discharged from that portion, thus adjusting the pressure on the shaft end from the radial bearing main body. CONSTITUTION:A part of gas allowed out of an impeller 8 thrusts a balance piston 7 axially rightwards with its pressure and is allowed to pass alongside the cylindrical surface of the balance piston 7 and then pass through a radial- bearing armature 2 serving as a radial electromagnetic bearing portion, a radial- bearing annular armature 3, a radial-sensor armature 4 and a radial-sensor annular armature 5 while cooling them, and is collected in a sealed portion 10 downstream of the electromagnetic bearing. A control valve 6 that operates as it detects the amount of axial movement of a rotating shaft adjusts the amount by which the gas collected in the portion 10 is discharged. Therefore, the thrust exerted on the rotating shaft 1 can be adjusted by adjusting the gas pressure of the portion 10 downstream of the electromagnetic bearing that thrusts the end face 9 of the rotating shaft.

4. 发明专利

JPH06288397A NOISE REDUCING DEVICE FOR CENTRIFUGAL COMPRESSOR 失效
公开(公告)号：JPH06288397A
公开(公告)日：1994-10-11
申请号：JP8173993
申请日：1993-04-08
申请人： HITACHI LTD
发明人： YOSHIUMI HIROTO , MATSUSHITA OSAMI
IPC分类号： F04D29/44 , F04D29/66
摘要： PURPOSE:To suppress the generation of a standing wave while keeping the function of a centrifugal compressor, and reduce the generation of vibration or noise by setting a resonance type silencer having a section in the part of a node in the standing wave generated in a diffuser. CONSTITUTION:When a centrifugal compressor is operated, a standing wave 2 by a columnar resonance having the part enclosed by a diffuser vane 1 and a diffuser wall vertical thereto as a resonance tube is internally generated in a diffuser. The noise generated by the standing wave 2 is most influenced by those generated by the sound wave having a half wavelength substantially equal to the diffuser length. Thus, a resonance type silencer 3 having a section is set in the part of a node in the standing wave 2. Namely, the resonance type silencer 3 having a substantially middle radius between the inlet radius and outlet radius of the diffuser vane 1 having a rotating shaft as the center and a circular inlet hole is arranged in the diffuser vane 1. The generation of the standing wave 2 is thus suppressed to reduce the generation of vibration or noise.

5. 发明专利

JPH06101698A DEVICE FOR REDUCING NOISE OF CENTRIFUGAL COMPRESSOR 失效
公开(公告)号：JPH06101698A
公开(公告)日：1994-04-12
申请号：JP22121592
申请日：1992-08-20
申请人： HITACHI LTD
发明人： YOSHIUMI HIROTO
IPC分类号： F04D29/44 , F04D29/66
摘要： PURPOSE:To efficiently reduce vibrations and noises of a centrifugal compressor respectively by providing two rows of guide blades of a diffuser in the direction of flow while disposing resonance type silencers between the respective guide blades over the whole circumference centering around a rotary shaft. CONSTITUTION:In operating a centrifugal compressor, a stationary wave 2 caused by columnar resonance in a resonance pipe of a section having guide blades and a diffuser wall perpendicular thereto surrounded is generated in a section of the diffuser with the guide blades. Then, the noise caused by the stationary wave is maximized by the sound wave having half-wave length in the resonance pipe, i.e., having the half-wave length equal to the length of a diffuser vane 1. Thus, the diffuser is halved at the nodal portion of the stationary wave 2 in the direction of flow, Resonance type silencers 3 are disposed between two rows of diffusers over the whole circumference centering around a rotary shaft, so that the vibration and noise of the centrifugal compressor can be efficiently reduced respectively.

6. 发明专利

JP2000346496A AIR CONDITIONER FOR RAILWAY VEHICLE 失效
公开(公告)号：JP2000346496A
公开(公告)日：2000-12-15
申请号：JP16202199
申请日：1999-06-09
申请人： HITACHI LTD
发明人： HIRAKAWA HARUO , INOUE AKINORI , YOSHIUMI HIROTO
IPC分类号： B61D27/00 , B60H1/32 , F25B41/06
摘要： PROBLEM TO BE SOLVED: To prevent an electric leakage accident due to adherence of a condensed water of an evaporator to a motor driven expansion valve and to suppress heating of the valve by installing the valve between an indoor fan and the evaporator, and cooling a coiled portion of the valve with the air cooled by the evaporator. SOLUTION: A compressor chamber is provided at a central portion of the air conditioner, an outdoor unit chamber is provided at its right side, an indoor unit chamber is provided at its left side, an outdoor fan 1 is provided at a center of the outdoor unit chamber, and condensers 2a, 2b are disposed at front and rear side of the fan 1. Compressors 3a, 3b and accumulators 4a, 4b are installed in the compressor chamber. An indoor fan 5 and evaporators 6a, 6b are disposed in the indoor unit chamber, and motor driven expansion valves 7a, 7b are mounted between the fan 5 and the evaporators 6, 6b. A switchboard 9 is installed in a separate chamber isolated by a partition plate of the compressor chamber, and a controller 10 of the expansion valve is mounted at the partition plate of the indoor unit chamber from the compressor chamber.

7. 发明专利

JPH09119299A OPENING-CLOSING DEVICE FOR DUCT 失效
公开(公告)号：JPH09119299A
公开(公告)日：1997-05-06
申请号：JP27781695
申请日：1995-10-25
申请人： HITACHI LTD
发明人： YOSHIUMI HIROTO , ASANUMA KUNIHIRO
IPC分类号： E21F1/00 , E21F1/10
摘要： PROBLEM TO BE SOLVED: To facilitate opening and closing by remote control by simple constitution, and to make installation space small-sized. SOLUTION: A plurality of pairs of linear guide mechanisms 33 arranged at regular intervals so as to be mutually faced oppositely are installed onto opposed side faces in a duct 31 constituting a ventilation flue. A plurality of shielding plates 41, 42, 43, to which connecting members 41a, 42a, 42b, 43b separately borne to the linear guide mechanisms 33 movably and capable of being mutually contacted and separated with and from end sections in the direction of movement of the adjacent opposed surfaces are formed, and a hanging wire 38 being wrapped on a wind-up drum 37 and moving the shielding plate 41 along the linear guide mechanism 33 are mounted.

8. 发明专利

JPH06200938A RADIAL ELECTROMAGNETIC BEARING 失效
公开(公告)号：JPH06200938A
公开(公告)日：1994-07-19
申请号：JP34795092
申请日：1992-12-28
申请人： HITACHI LTD
发明人： YOSHIUMI HIROTO , TAKEDA KAZUO
IPC分类号： F16C32/04
摘要： PURPOSE:To prevent abnormal vibrations of a bearing by reducing the heat to be generated in an electromagnetic bearing. CONSTITUTION:Both annular armatures are polished so that the diameter of an annular armature 5 for radial sensor may be smaller than that of an annular armature 3 for radial bearing, and the annular armature 3 for radial bearing is machined after being polished. Thus, the respective silicon steel plates of the annular armature 3 for radial bearing are completely insulated, and the heat to be generated in the annular armature 3 for radial bearing is reduced by the machining of minimum requirement. This constitution reduces the heat to be generated in the electromagnetic bearing by the machining of minimum requirement, and abnormal vibrations of the bearing can be prevented by simple machining.

9. 发明专利

JP2001165527A AIR CONDITIONER 失效
公开(公告)号：JP2001165527A
公开(公告)日：2001-06-22
申请号：JP34834099
申请日：1999-12-08
申请人： HITACHI LTD
发明人： FUKUSHIRO KAZUHIRO , MATSUSHIMA HIROAKI , HIRAKAWA HARUO , YOSHIUMI HIROTO
IPC分类号： B60H3/00 , F25B13/00 , F25B29/00 , F25B39/00
摘要： PROBLEM TO BE SOLVED: To enable a heat exchanging performance of an outdoor heat exchanger during a defrosting operation to be improved and a frosting at the outdoor heat exchanger to be restricted at the time of low temperature of outdoor area for the outdoor heat exchanger in an air conditioner and further enable a dehumidifying operation for energy saving. SOLUTION: Each of outdoor heat exchangers 3a, 3b, 8a, 8b of a plurality of freezing cycles is thermally contacted through a heat transfer fin 3f to form integral outdoor heat exchangers 3, 8 in an air conditioner capable of performing a dehumidifying operation so as to control such that one of plurality of freezing cycles is set to a cooling cycle and at the same time the other is set to a heating cycle to perform a dehumidifying operation.

10. 发明专利

JP2000006801A AIR CONDITIONER FOR RAILWAY ROLLING STOCK 失效
公开(公告)号：JP2000006801A
公开(公告)日：2000-01-11
申请号：JP17074398
申请日：1998-06-18
申请人： HITACHI LTD
发明人： HIRAKAWA HARUO , KOBAYASHI KENJI , YOSHIUMI HIROTO
IPC分类号： B61D27/00 , B60H1/32
摘要： PROBLEM TO BE SOLVED: To prevent intrusion of hydrocarbon into a passenger room even when it leaks, to dilute a leaked coolant by outside air so that it does not explode and to minimize leaked gas quantity on an air conditioner using hydrocarbon as a coolant. SOLUTION: This air conditioner is constituted of a first stage refrigerating cycle A with hydrocarbon as a coolant and a second stage refrigerating cycle B with water as a coolant, and a passenger room 20 is cooled by the second stage refrigerating cycle B. An indoor cabin is isolated from the cabin outside by a partition wall and is frame-structured so that an intermediate heat exchanger room in which an intermediate heat exchanger to exchange heat is arranged is ventilated by air of an outdoor air blower between the first stage and second stage refrigerating cycles. Additionally, a compressor is stopped by detecting gas leakage or detecting temperature rise, and gas leaking quantity is minimized by closing a solenoid valve on the high pressure side.

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