Eddy sink prevention manner and eddy sink prevention device equipped axis of ordinates pump null of axis of ordinates

摘要

PURPOSE: To enable drainage operation down to an area equal to or lower than the conventional operation possible lowest water level LWL (operation possible lowest water level) proper to a vertical shaft pump. ;CONSTITUTION: When a vortex V is generated in a water absorbing tank 1 by operation of a vertical shaft pump P, this vortex V is detected by image recognition of an image pickup device 10 such as a CCD camera, and a vortex detecting signal is outputted to a control means 11 such as a microcomputer, and the control means 11 judges a position of the vortex V by image processing, and selects and determines a pressure water jetting hole 8 closest to the vortex V from pressure water jetting holes 8, 8.... When an 'open' signal is outputted to an opening and closing means 9 interposed between these pressure water jetting holes 8, pressure water whose pressure is increased by an impeller 2 can be jetted toward a vortex V generating part from the pressure water jetting hole 8 opened by the opening and closing means 9.;COPYRIGHT: (C)1994,JPO