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1. 发明专利

JPS63309824A ABNORMALITY DIAGNOSING METHOD FOR MACHINE 失效
公开(公告)号：JPS63309824A
公开(公告)日：1988-12-16
申请号：JP14527587
申请日：1987-06-12
申请人： HITACHI LTD , HITACHI DENSHI SERVICE KK
发明人： IWASE KOJI , FUJITA HAJIME , MIYATA KOJI , YASUDA HIDEAKI , MACHIDA NAOYOSHI
IPC分类号： G01M99/00 , G01H3/00 , G01H17/00
摘要： PURPOSE:To enable an abnormal position to be decided, to increase deciding ability, and to improve the reliability of diagnosis by finding the effective values of acoustic spectra at respective positions from the detection results of acoustic sensors installed at plural positions inside or outside a machine to be diagnosed, and finding the ratios too a preset reference value. CONSTITUTION:An acoustic sensor 1 set at a reference position detects and amplifies a noise generated by the machine to be diagnosed and a band-pass filter 3 passes a signal in a certain frequency band. Then an effective value circuit 4 finds the effective value of an acoustic spectrum and a microcomputer 6 finds the ratio of the effective value and the reference value of a preset and stored acoustic spectrum. Then it is decided whether the machine is abnormal or not from whether or not the ratio exceeds a certain permissible value. Here, the reference value is set by finding the mean value of acoustic spectrum effective values of many machines.

2. 发明专利

JPS63313022A ABNORMALITY DECIDING DEVICE FOR ROTARY MACHINE 失效
公开(公告)号：JPS63313022A
公开(公告)日：1988-12-21
申请号：JP14903187
申请日：1987-06-17
申请人： HITACHI LTD , HITACHI DENSHI SERVICE KK
发明人： IWASE KOJI , FUJITA HAJIME , MIYATA KOJI , YASUDA HIDEAKI , MACHIDA NAOYOSHI
IPC分类号： G01M99/00 , G01H17/00
摘要： PURPOSE:To reduce the size and weight of a device by providing a band extracting circuit which extracts a necessary band component from an acoustic sensor output signal, a low-frequency component extracting circuit which extracts an envelope signal from the output of the circuit, etc. CONSTITUTION:Acoustic sensors 1 are fitted to many rotary machines of the same type, and the values of A/D conversion 9 of their outputs are measured, their mean value (monitor value) is stored in a storage part 12. Then the signal from the sensor 1 fitted to an object machine to be measured is amplified 2 and a BPF 3 extracts a signal in a frequency band where the influence of noises, etc., is a little. Then the envelope signal of the signal is extracted by an RMS circuit 4. This envelope signal contains a frequency component based upon periodic and impulsive force generated owing to the presence of the waving of the track surface of a bearing, etc. here, the envelope signal is passed through a BPS 5, then averaged by an RMS circuit 8, and A/D converted 9 before being inputted to a microcomputer 10. The microcomputer 10 stores data (measured value) from the converter 9 in the storage part 12, also takes a diagnosis based upon the monitor value and measured value, and displays the diagnostic result on a display part 11.

3. 发明专利

JPS63281025A DIAGNOSING METHOD FOR ABNORMALITY OF MACHINE BODY ACOUSTIC SIGNAL 失效
公开(公告)号：JPS63281025A
公开(公告)日：1988-11-17
申请号：JP11456887
申请日：1987-05-13
申请人： HITACHI LTD , HITACHI DENSHI SERVICE KK
发明人： IWASE KOJI , MIYATA KOJI , YASUDA HIDEAKI , FUJITA HAJIME
IPC分类号： G01M99/00 , G01H3/08 , G01H17/00
摘要： PURPOSE:To apply the same criterion to many machines by detecting the sound pressure of a machine and finding an acoustic spectrum within a specific frequency range according to the detected sound pressure, and correcting it with a variation acoustic spectrum found by performing measurement several times. CONSTITUTION:A sound pressure sensor 1 detects the sound pressure of the object machine to be diagnosed, the output of the sensor 1 is amplified 2, and a signal of specific frequency is passed through a filter 3; and an effective value circuit 5 obtains an effective value, which is A/D-converted 6, inputted to a microcomputer 7, and stored in a memory 9. In this constitution, the acoustic spectrum inputted to the microcomputer 7 is stored in the memory 9 while having a specific sound pressure level SPL(n). Further, the mean value of (m) measured sound pressure level is calculated, its standard deviation SPLsigma(n) is found and corrected as a corrected acoustic spectrum, and then the acoustic spectrum SPLa(n) is found from SPLa(n)=SPL(n)-SPLsigma(n). This spectrum SPLa(n) is reduced in the influence of the sound of the machine and variance in measurement, so the diagnosing ability is improved.

4. 发明专利

JPH0559388B2 失效
公开(公告)号：JPH0559388B2
公开(公告)日：1993-08-30
申请号：JP8881187
申请日：1987-04-13
申请人： HITACHI LTD
发明人： FUJITA HAJIME , KOYANO KYOSHI
IPC分类号： H04R17/00 , G01S7/52 , G01S7/521

5. 发明专利

JPH0510814A VISUALIZING APPARATUS OF SOUND SOURCE 失效
公开(公告)号：JPH0510814A
公开(公告)日：1993-01-19
申请号：JP16422791
申请日：1991-07-04
申请人： HITACHI LTD
发明人： IIDA AKIYOSHI , FUJITA HAJIME , TAKANO YASUSHI , AIZAWA ETSUKO
IPC分类号： G01H3/00
摘要： PURPOSE:To obtain a method for investigating and visualizing a sound source inside a flow field, by using the results of measurement of changes in the vorticity and the velocity of the flow field, regarding a method for investigation of a turbulent flow noise source. CONSTITUTION:The title apparatus is constructed of a vorticity sensor 3 for detecting a change in vorticity and a change in velocity in a flow field, a traverse device 2 for moving the sensor, a velocity change detecting device 4 provided at a fixed position in the flow field, a condition extracting device 5 for detecting the condition of the flow field, a phase average processing device 6 which computes a phase space average value of the flow field from data obtained from the vorticity sensor, and a sound source computing device which detects a turbulent flow noise source from the space distribution of the changes in the vorticity and the velocity. It is possible to investigate the source of generation of turbulent flow noise from the measured vorticity of the flow field and to visualize a sound source.

6. 发明专利

JPH04159495A VOLUTE PUMP 失效
公开(公告)号：JPH04159495A
公开(公告)日：1992-06-02
申请号：JP27901590
申请日：1990-10-19
申请人： HITACHI LTD
发明人： YOSHITOMI TOSHIJI , KOBAYASHI KAZUO , FUJIO MASAYUKI , ITO EIICHI , ASABUKI HIROSHI , CHIHARA YUKIO , FUJITA HAJIME
IPC分类号： F04D23/00
摘要： PURPOSE:To facilitate carrying by forming a handle in a silencer casing while increasing its volume to obtain an excellent silencing effect by forming the silencer casing into constitution having a riseup part and a swollen part. CONSTITUTION:A vortex flow blower has a casing constituted by integrally connecting a blower casing 3 serving as an impeller casing, motor housing and a silencer casing 5. Here, a partition 5a in a peripheral surface of the silencer casing 5 is formed into a box shape having a predetermined width 1 in a base surface 5e under the partition 5a, to form a riseup part 5b rising from the inside toward a part having a maximum width L(L>1) of the blower casing 3. A swollen part 5c, swollen to the outer so as to continue to the riseup part 5b along a peripheral surface of an electric motor, is formed in the partition 5a. Accordingly, even when dimension of a mounting leg 5d is formed equal to the maximum diametric dimension L of the blower casing 3, tightening work of bolts and nuts can be performed by inserting a hand to a part of this mounting leg.

7. 发明专利

JPH03175196A VORTEX FLOW BLOWER 失效
公开(公告)号：JPH03175196A
公开(公告)日：1991-07-30
申请号：JP4927090
申请日：1990-03-02
申请人： HITACHI LTD
发明人： YAMAZAKI SUSUMU , ITO EIICHI , FUJIO MASAYUKI , FUJITA HAJIME , ASABUKI HIROSHI , KOBAYASHI KAZUO
IPC分类号： F04D23/00
摘要： PURPOSE:To remarkably improve aerodynamic performance and reduce noise by forming a blade form from the inner circumferential end of the blade to the center part into a curved face so that the entrance angle in the axial direction of the inner circumferential edge and the front edge of the blade of the center part are formed in a prescribed range. CONSTITUTION:When entrance angles in the axial direction of the front edge of a blade 5 at the inner circumferential end 5b and the center part 5c are respectively instituted gammai, gammac, the blade form at least from the inner circumferential end 5b to the center part 5c is formed into a curved face so that both the gammai, gammac are smaller than 90 degree and gammai>gammac. Hereby, at least on the inner circumferential side, the entrance angle in the axial direction at the front edge of the blade 5 is decided so that the air flow coincides with the composite vector of the speed vector along an annular flow passage and the speed vector crossing the direction of the rotor axis in the annular flow passage, further the entrance angle in the circumferential direction is decided, and the blade form is three-dimensionally molded. Therefore, generation of turbulence of inner flow such as air vortex flowing in the inner circumferential side and stagnation is remarkably reduced, and aerodynamic performance is drastically improved compared with conventional one.

8. 发明专利

JPH0264300A BLADE FOR FAN 失效
公开(公告)号：JPH0264300A
公开(公告)日：1990-03-05
申请号：JP21500488
申请日：1988-08-31
申请人： HITACHI LTD
发明人： TAKADA YOSHIHIRO , FUJITA HAJIME
IPC分类号： F04D29/30 , F04D29/68
摘要： PURPOSE:To remarkably reduce turbulence noise by using so-called corrugated blades and arranging plates which serve as pressure faces and have curvature near the blade rear edge. CONSTITUTION:A blade 3 is formed in a corrugate shape with irregularities in the span direction. A plate 4 with curvature serves as a pressure face and is fitted from one portion of the protruded portion on the pressure face side to the rear edge section. A fluid on the pressure face side can be blown out from the pressure face to the blade rear edge section which is a negative pressure face through corrugated passages. The growth of turbulences from the free turbulence shear flow at the blade near edge serving as the main sound source of turbulence noise is reduced, thereby turbulence noise can be remarkably reduced.

9. 发明专利

JPH01167494A CROSSFLOW FAN 失效
公开(公告)号：JPH01167494A
公开(公告)日：1989-07-03
申请号：JP32401287
申请日：1987-12-23
申请人： HITACHI LTD
发明人： TAKADA YOSHIHIRO , SEKINE YOJI , FUJITA HAJIME , KASHIWAZAKI SUSUMU , UNEYAMA YOSHIHISA
IPC分类号： F04D17/04 , F04D29/66
摘要： PURPOSE:To obtain a crossflow fan of high output and of low noise by providing a vane projecting toward the bottom end of a fan body, on the nose part. CONSTITUTION:A nose part 2 provided close to a peripheral side face of a fan body 3 and an inner wall of a casing 1 form a discharge opening 4 for air. A projecting part 5 is provided on inner corner portion of the nose part 2 for the purpose of making a gap between the fan body 3 and the nose part 2 small. A vane 6 fixing position of vortex, guiding vortex going toward the discharge opening 4 and recovering static pressure is provided still more on the projecting part 5 toward tangential direction on the bottom end of the fan body 3.

10. 发明专利

JPS6484037A OUTDOOR UNIT FOR AIR CONDITIONER 失效
公开(公告)号：JPS6484037A
公开(公告)日：1989-03-29
申请号：JP24073987
申请日：1987-09-28
申请人： HITACHI LTD
发明人： TAKADA YOSHIHIRO , SEKINE YOJI , FUJITA HAJIME
IPC分类号： F24F5/00
摘要： PURPOSE:To reinforce the structure and improve the riser for drain processing so as to reduce the noise level by forming the air inlet configuration of the upstream side unit for a heat exchanger in a recess in the same direction as the fan shroud when viewed from the upstream side, and aligning its imaginary center nearly with the propeller fan shaft. CONSTITUTION:The outdoor fan unit has a heat exchanger 4 ahead of a propeller fan 7, and the propeller fan inlet passage is formed by its rear panel 6, side plate 5, unit top 1, unit bottom 2 and compressor separator 8. Air inlets in the unit top and bottom 1, 2 are aligned nearly with the axis of the propeller fan 7, and their risers are formed in recessed shape 3, 4 in the same direction as the blade circumference. Therefore, the noise level can be reduced without losing the effect of riser which serves as reinforcement in the past and without modifying the past manufacturing method.

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