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Liquid level control system

A liquid level control and liquid level technology, applied in liquid level control, control/regulation system, non-electric variable control and other directions, can solve problems such as waste, and achieve the effect of reducing labor intensity and improving work efficiency

Inactive Publication Date: 2014-06-18
南京恒誉名翔科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid level in the reservoir needs to be maintained at an appropriate height. If it is too full, it will overflow and cause waste. If it is too small, it will not meet the demand.

Method used

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  • Liquid level control system

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Embodiment Construction

[0015] Such as figure 1 As shown in , the liquid level sensor in the water tank collects liquid level signals, processes the collected liquid level signals, and obtains signals that can be received by the ADC module. After AD conversion, digital filtering is performed to filter out high-frequency interference, and then Carry out scale transformation and convert to digital quantity of water level. The DSP calculates the size of the error control amount between the collected water pressure value and the set water pressure value, and sends it to the PID control module. After the PID operation, it outputs the corresponding PWM wave, and then performs corresponding signal processing and converts it into The frequency converter can receive the analog voltage signal, change its output frequency, and then change the speed of the water pump.

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Abstract

Provided is a liquid level control system. A closed-loop system composed of a controller, a pressure sensor, an A / D converter, a control output, an MM420 frequency converter, and a water pump driven by a direct-current brushless motor is used as the control core of the liquid level control system. The liquid level control system further comprises a photoelectric coupling circuit, an I / V conversion circuit, a voltage matching circuit, a filter circuit and the like. In order to realize constant-liquid-level water supply, first, water pressure information of a water tank is periodically acquired through a liquid pressure sensor arranged in the water tank, the water pressure information is converted into a standard signal within an amplitude range, and the standard signal is input to a DSP for AD conversion, filtering and scale transform so as to convert the pressure information into a digital pressure Hf. The DSP compares the actual pressure value of the water tank with a set pressure value to form a deviation control quantity, and an output PWM waveform signal is controlled according to the law of a PID control algorithm. The output frequency of the MM420 frequency converter is changed by changing the duty ratio of the PWM waveform signal so as to change the speed of the water pump, change the pumping rate of the water tank and maintain the stability of the water level of the water tank.

Description

technical field [0001] The present invention is a liquid level control system, specifically a liquid level control system applied to places involving liquid level and flow in daily life and industrial production. Background technique [0002] People's life and industrial production often involve the control of liquid level and flow, such as beverage, food processing, residential water supply, solution filtration, sewage treatment, chemical production and other production and processing processes, usually using liquid storage pool. The liquid level in the liquid storage tank needs to be maintained at an appropriate height. If it is too full, it will easily overflow and cause waste. If it is too small, it will not meet the demand. Therefore, it is necessary to design a suitable controller to automatically adjust the flow in and out of the liquid storage tank, so that the liquid level in the liquid storage tank remains at a normal level, so as to ensure product quality and pro...

Claims

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Application Information

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IPC IPC(8): G05D9/12
Inventor 王瑛李忠喜
Owner 南京恒誉名翔科技有限公司
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