Liquid level control system

Abstract

The invention relates to a liquid level control system which comprises a first control valve connected to a water inlet pipeline of a water pool with the liquid level to be tested, a second control valve connected to a water outlet pipeline of the water pool with the liquid level to be tested and a liquid level changing sensing mechanism. The liquid level changing sensing mechanism comprises a base body, a floating ball component, a rocker bar mechanism and a mercury switch. The floating ball component is arranged on the base body. The floating ball component is connected with the mercury switch through the rocker bar mechanism. The mercury switch inclines and can be communicated with a middle electrode and an electrode on one side. The liquid level control system has the advantages of being novel in structure, low in manufacturing cost, adjustable in accuracy, great in flexibility and stability and good in control effect.

Description

technical field [0001] The invention relates to a liquid level control system which can trigger a switch signal once the preset liquid level fluctuates up and down, so as to correct the liquid level and return to the preset value. Background technique [0002] Liquid level control is a common process control in industry, and its impact on production cannot be ignored. At present, liquid level control is basically realized by setting up a control system. This type of control system introduces a controller, such as PLC, which not only has a complex structure and high cost, but also has characteristics such as hysteresis and coupling. [0003] In actual use, we often do not need to quantitatively measure the deviation of the liquid level to control the liquid level. We only need to measure whether the liquid level is higher or lower than the preset value. Therefore, we only need to feedback the switch value. At present, although there are liquid level control systems built wit...

AI Technical Summary

Problems solved by technology

At present, although there are liquid level control systems built with controllers such as PLCs on the market, such control systems are not only expensive, but also have high requirements for the accuracy of liquid level sensors in terms of precise liquid level control.

Many of the existing liquid level sensors are sensing mechanisms that trigger the switching value when the liquid level changes, but the existing sensing mechanisms of this type have the following deficiencies: 1. This existing liquid level sensing mechanism There is a sensing lag at the time, and the fluctuation of the liquid level cannot be filtered, and there are many false sensings; 2. The sensing accuracy of the existing liquid level change sensing mechanism cannot be adjusted, and the application range is greatly limited.

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