A constant pressure automatic operation control method for a variable speed electric pump

Abstract

The invention relates to a constant-pressure automatic operation control method for a variable speed electric pump. A flow controller necessary in a conventional constant-pressure automatic operation control method is cancelled. The method comprises the steps of: adopting a characteristic curve of an actually measured pump and writing the characteristic curve into a controller program of a microprocessing chip, collecting an operation pressure value by virtue of a pressure sensor, converting the operation pressure value to rotating speed and flow at a preset constant-pressure value, and if the flow value is smaller than the set minimum low, cutting off the electric pump; if the flow is greater than the set maximum flow value, controlling operation of the electric pump in a limiting value of the maximum power; if the flow is between the minimum flow and the maximum flow value, performing operation according to the converted rotating speed and performing operation at the constant-pressure value by fine adjustment of the rotating speed; combining two states: leakage of a pipeline or an outlet and off of a normal outlet and executing automatic on-off to reduce the energy consumption and machine loss; and judging the normal and leakage states according to time difference between off and restart next time, and if the leakage state is judged, no longer automatically restarting.

Description

technical field [0001] The invention belongs to the field of automatic control operation of electric pumps, and specifically relates to a control method for driving a water pump controlled by a variable-speed motor controlled by a micro-processing chip to realize constant-voltage automatic operation of the electric pump. Background technique [0002] Users often need the pump to have a constant pressure automatic operation function. Using this constant pressure automatic water supply control method allows users to obtain the same water experience as using urban tap water pipe networks: that is, water supply in a closed pipeline after the electric pump is installed In the system, the electric pump is connected to the power grid for a long time. When the user opens the water outlet (faucet), the electric pump starts to work automatically and runs at the set pressure. When the water outlet (faucet) is closed and the pressure rises to a certain level, the electric pump The pump ...

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Problems solved by technology

[0003] However, the disadvantage of the above-mentioned traditional constant pressure automatic operation method is that the automatic start-stop function of the electric pump requires a high-cost flow sensor, and the flow sensor is often adsorbed by ferromagnetic substances in the fluid, or by other long strips The winding will greatly affect the accuracy of its flow data collection, and even cause its function to be completely lost; on the other hand, its constant pressure control is to adjust the speed of the pump to achieve constant pressure control by repeatedly collecting and comparing the values ​​of the pressure sensor and flow sensor. For the purpose of this method, many empirical parameters are used in this method of repeated attempts to achieve control. The process is complicated, and it is greatly affected by the installation occasion and the individual differences of the pump, resulting in poor reliability. Pump

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