公开(公告)号：EP0720693A1

公开(公告)日：1996-07-10

申请号：EP94928220.0

申请日：1994-09-20

申请人： Diversey Corporation

发明人： LIVINGSTON, James, W. ,  HOSKING, Stephen

IPC分类号： D06F39 ,  F04B43 ,  F04B49 ,  G05D7

CPC分类号： G05D7/0682 ,  D06F39/022 ,  F04B43/0081 ,  F04B49/065 ,  F04B2203/0201 ,  F04B2203/0203 ,  F04B2203/0208 ,  F04B2205/05

摘要： The present invention is an improved flow-metered pumping system using an air-backed diaphragm pump with load compensation. A variable motor speed controller is used to compensate for flow rate reduction caused by pressure effects. When the output pressure on the pump increases to a point where the load on the pump motor exceeds a specified threshold, the motor speed controller increases the speed of the motor to compensate for pressure induced diaphragm distortion losses and to achieve a substantially constant flow rate across a range of pump output pressures.