公开(公告)号：US20180080442A1

公开(公告)日：2018-03-22

申请号：US15706374

申请日：2017-09-15

Applicant: Wanner Engineering, Inc.

Inventor： Paul Davis ,  Mike Jaworsky

IPC: F04B49/06 ,  F04B17/03

CPC classification number: F04B49/06 ,  F04B17/03 ,  F04B43/02 ,  F04B43/04 ,  F04B43/067 ,  F04B49/065 ,  F04B49/08 ,  F04B2203/0201 ,  F04B2203/0207 ,  F04B2205/05

Abstract: A pump system includes a positive displacement pump, such as a diaphragm pump, an electric motor directly coupled to the positive displacement pump, and a programmable controller configured to maintain a desired current to the electric motor. The programmable controller is adapted to sense the current to the motor and to maintain constant current. It has been found that constant current provides constant torque and constant torque achieves constant fluid discharge pressure from the pump. The programmable controller utilizes an absorbed power formula to determine the correct current to achieve the necessary torque for a desired fluid discharge pressure. The programmable controller includes a power saving mode with minimal current and the pump is “dead headed” with no flow. The system is operated with a method that maintains constant fluid discharge pressure as well as having a power saving mode.