System and method for adjusting pump revolution speed

Abstract

The invention discloses a system and method for adjusting a pump revolution speed, and relates to the technical field of pump revolution speed adjustment. The system comprises a monitoring device, used for monitoring an actual pressure intensity difference between an inlet and an outlet of an adjustment valve in real time; a controller, used for calculating an output frequency according to the actual pressure intensity difference and a set pressure intensity difference P preset in the controller; and a frequency converter, used for adjusting the pump revolution speed according to the output frequency to allow the actual pressure intensity difference to reach the set pressure intensity difference P. The method comprises the following steps: acquiring the actual pressure intensity differencebetween the inlet and the outlet of the adjustment valve on a pipeline communicating with a pump in real time; calculating the output frequency according to the actual pressure intensity difference and a preset pressure intensity difference P; and adjusting the pump revolution speed in real time according to the output frequency to allow the actual pressure intensity difference to reach the set pressure intensity difference P. By monitoring the pressure intensity difference between two sides of the adjustment valve, the system adjusts the pump revolution speed, so that the aperture of the adjustment valve and an output flow rate are in a direct proportion relation.

Description

technical field [0001] The invention relates to the technical field of pump rotation speed adjustment, in particular to a system and method for adjusting pump rotation speed. Background technique [0002] In the automatic control of modern factories, regulating valves play a very important role. The production of many factories depends on the correct distribution and control of fluids. For example, a certain amount of fluid is input into the container by adjusting the opening of the regulating valve. Usually, the regulating valve is arranged on the pipeline, and the inlet of the pipeline is connected with the pump, and the pump rotates to output the fluid. However, when the opening of the regulating valve changes, the cross-sectional area S of the current opening of the regulating valve changes. At this moment, the speed of the pump remains unchanged, and the flow Q of the fluid output by the pump remains unchanged. According to Q=V*S, the flow Q If the cross-sectional area...

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Problems solved by technology

However, when the opening of the regulating valve changes, the cross-sectional area S of the current opening of the regulating valve changes. At this moment, the speed of the pump remains unchanged, and the flow Q of the fluid output by the pump remains unchanged. According to Q=V*S, the flow Q If the cross-sectional area S changes, the cross-sectional area S of the current opening of the regulating valve is not proportional to the flow Q, and the purpose of controlling the flow cannot be achieved by adjusting the opening of the regulating valve.

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