PUMP SYSTEM

• Main Authors: KAMINAGA KAZUHIRO, HADO MAKOTO
• Format: Patent
• Language: English; Japanese
• Published: 20.10.2016
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

PROBLEM TO BE SOLVED: To provide a pump system capable of surely detecting occurrence of cavitation, and capable of eliminating such situations in which cavitation occurs.SOLUTION: A pump system 50 includes a pump 51, a driving motor 52 which transmits driving force to the pump 51 and of which rotation speed is adjusted in accordance with a frequency, a secondary side pressure sensor 56 for detecting a secondary side pressure of the pump 51, and a control section 91 which can control the driving motor 52 by a prescribed set frequency. The control section 91 monitors the secondary side pressure sensor, and controls the driving motor 52 by a frequency lower than the set frequency when amplitude of a pressure exceeding a threshold set on the basis of a pressure in a steady state in which cavitation does not occur is detected. The control section 91 notifies the occurrence of the cavitation via a display section 93 when the frequency is lowered to a lower limit frequency.SELECTED DRAWING: Figure 2 【課題】キャビテーションの発生を確実に検出するとともに、キャビテーションが発生する状態を解消することができるポンプシステムを提供すること。【解決手段】ポンプシステム５０は、ポンプ５１と、ポンプ５１に駆動力を伝達し、周波数によって回転数が調節される駆動モータ５２と、ポンプ５１の二次側の圧力を検出する二次側圧力センサ５６と、駆動モータ５２を所定の設定周波数で制御可能な制御部９１と、を備える。制御部９１は、二次側圧力センサを監視し、キャビテーションが生じていない定常状態の圧力に基づいて設定される閾値を超えた圧力の振れを検出すると、設定周波数よりも低い周波数で駆動モータ５２の制御を行う。そして、下限周波数まで周波数が低下すると、制御部９１は、キャビテーションの発生を表示部９３によって報知する。【選択図】図２