Chlorinator opening automatic control method based on analog quantity feedback

Abstract

The invention provides a chlorinator opening automatic control method based on analog quantity feedback, the opening of a chlorinator is automatically controlled by utilizing the physical property that resistance in a potentionmeter of the chlorinator parabolically changes as the working condition of the chlorinator changes, the accuracy rate is high, operation is simple and convenient, and costs are saved. The chlorinator opening automatic control method based on analog quantity feedback includes the following steps: a power supply is connected to a potentionmeter of a chlorinator in series, the opening of the chlorinator changes from completely closed to completely opened, thereby obtaining a curve of change of resistance R as time T increases, R=aT<2>+b, T is some time when the opening of the chlorinator changes from completely closed to completely opened, and a and b are coefficients; a minimum value Rmin and a maximum value Rmax of the resistance R of the potentionmeter when the opening of the chlorinator changes form completely closed to completely opened are obtained, and a working voltage U is determined; a control current is configured through configuration programming software to a programmable logic controller (PLC) analog quantity and is output, and the opening of the chlorinator is controlled in a quantitative manner through the value of the PLC analog quantity.

Description

technical field [0001] The invention relates to the field of automatic control methods for chlorination in water plants, in particular to an automatic control method for the opening of a chlorinator based on analog feedback. Background technique [0002] The chlorinator is a necessary equipment for how to add appropriate chlorine gas into the target water in the field of water automatic control system. The working principle of the chlorinator is mainly to change the chlorine gas from liquid chlorine to gaseous chlorine. Generally, the following process is required. In the liquid chlorine cylinder Chlorine volatilizes from a liquid state to a gaseous state, through the angle valve of the chlorine bottle, flexible copper pipe, chlorine gas filter, chlorine gas pressure gauge, pressure reducing valve, vacuum regulator, chlorinator and water injector, etc. As a device to control the chlorination process, the chlorinator needs to be combined with other related automatic control d...

AI Technical Summary

Problems solved by technology

[0004] At present, there is another kind of chlorinator on the market. It only has two working states of on or off. It mainly uses digital quantities to communicate with the programmable logic controller PLC, which does not have the conditions for intelligent control when it is automatically controlled.

The control of the opening of the chlorinator only has two states of on or off. Since there is no analog output condition, there is no memory function, so the system cannot know how long the chlorinator has been on or off, and the information cannot be fed back to the computer. As a result, when the computer controls the opening of the chlorinator, it is difficult to know exactly how much it is on or off

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