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1. 发明专利

JPS57183582A OPERATIONAL CONTROL METHOD OF PUMP 失效
公开(公告)号：JPS57183582A
公开(公告)日：1982-11-11
申请号：JP6968581
申请日：1981-05-08
申请人： HITACHI SHIPBUILDING ENG CO
发明人： KUWAKI MITSUNOBU , MOROZUMI SOUICHI , ASOGO REIICHIROU , SHIYUUBOU TOSHIAKI , TSUSHIMA SHINYA , TAKAHAMA HIDEMASA , OKAMOTO SHIYOUJI , TACHIKAWA MASAAKI , YOSHIKAWA MASAHIRO , UEMURA TAKUJI
IPC分类号： F04D15/00 , F04B11/00 , F04B49/10
摘要： PURPOSE:To automatically detect occurence of cavitation and air suction and prevent the occurrence, by previously storing a level of sound and vibration, for a pump when causing the cavitation, to a control device and comparing its memory value with a level of sound or vibration actually measured during operation. CONSTITUTION:A control device 12 is operated to continuously measure a generated sound by two measuring units 10, 11 and decide whether cavitation and air suction are caused or not. Decision of the cavitation is performed by comparing a measured value of the measuring unit 10 at the side of a pump 2 with a memory value of sound pressure and quality, while decision of the air suction is performed by a measured value of the measuring unit 11 at the side of a bell 9 and a memory value. At decision of occurrence of the cavitation or air suction, a suction valve 7 or delivery valve 8 is automatically reduced or speed of the pump is decreased.

2. 发明专利

JPS5813190A TRANSFER OF SLURRY BY PUMP 失效
公开(公告)号：JPS5813190A
公开(公告)日：1983-01-25
申请号：JP11108681
申请日：1981-07-15
申请人： HITACHI SHIPBUILDING ENG CO
发明人： NAKAI YASUO , TAKAHAMA HIDEMASA , TACHIKAWA MASAAKI
IPC分类号： B65G53/30 , F04D7/04 , F04D15/00 , G01N9/26 , G01N15/06
摘要： PURPOSE:To prevent coal particles from clogging by measuring a suction pressure and a discharge pressure of a slurry transfer pump and a current of a pump driving motor, computing a concentration or a density of slurry on the basis of the measurements, and supplying fresh water if the computed value exceeds a reference. CONSTITUTION:Pressure gauges 18, 19 and 20, 21 are disposed at suction sides and discharge sides of a suction pump 13 and a transfer pump 16 respectively, and ammeters 22, 23 are mounted to motors (not illustrated) for driving those pumps 13, 16 respectively. Those pressure gauges 18, 19, 20, 21 and ammeters 22, 23 are connected to an arithmetic controller 24 comprising a computer. Fresh water supply pipes 25, 26 open at the bottom of a hold 11 and at the upper part of a slurry storage tank 15, respectively. During transfer of slurry, output signals of the pressure gauges 20, 21 of the transfer pump 16 and the ammeter 23 are sent to the arithmetic controller 24, which computes a density of slurry from the measurements thereof. Based on the result, the controller controls opening or closing of a valve 28 of the fresh water supply pipe 26 of the tank 15 so that coal particles may be prevented from clogging.

3. 发明专利

JPS6122154B2 JPS6122154B2 - 失效
公开(公告)号：JPS6122154B2
公开(公告)日：1986-05-30
申请号：JP11108681
申请日：1981-07-15
申请人： Hitachi Shipbuilding Eng Co
发明人： NAKAI YASUO , TAKAHAMA HIDEMASA , TACHIKAWA MASAAKI
IPC分类号： B65G53/30 , F04D7/04 , F04D15/00 , G01N9/26 , G01N15/06
CPC分类号： B65G53/30

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