Water level control method and device for control signal acquired from earth

Abstract

The invention relates to the field of automatic control, in particular to a water level control method and a water level control device for a control signal acquired from the earth. An AC 220V power supply is input through a first step-down circuit of an L line and a second step-down circuit of an N line which is symmetrical about the L line, then rectified through a rectifying circuit and subjected to voltage stabilization through a filter voltage stabilizing circuit, and then provides a stable direct voltage for a post-stage executive circuit. When a water level in a container is lower than a low water level, a high water level electrode and a low water level electrode are exposed out of the water surface; a load pump is communicated with the AC 220V power supply, the pump is electrified to start to pump water, and the water level gradually rises; when the water reaches the high water level, the high water level electrode is immersed by the water, then the load pump is not electrified to stop pumping the water, and the water level is controlled at the high water level; and the water is discharged from the container and the water level is gradually declined, the high water level electrode is exposed out of the water surface, a second executive switch is on, a first executive switch is off, and the water level continues to decline, when the water reaches the low water level, a control system is reset to an original state.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to an AC water level control method and device in which control signals are collected from the earth. Background technique [0002] The water level control method and device relate to a method and device widely used in industrial and agricultural production and water storage devices in the field of life, and in particular to an automatic control method and device for solar water heaters, electric water heaters, gas water heaters and roof water tanks. [0003] Existing water level control methods and devices are mainly divided into the following two types: [0004] 1. Float reed switch type: [0005] The working principle of the float reed switch water level control method and device is: the magnetic float rises / falls correspondingly with the high / low water level, and the rise / fall of the magnetic float drives the closing / disconnecting of the reed switch, thereby realizing Automati...

AI Technical Summary

Problems solved by technology

Float reed switch type water level control method and device have inherent disadvantages due to its principle and structure: 1. The mechanical components that guide the magnetic float to perform the mechanical movement of raising / lowering are soaked in the liquid for a long time, and are corroded by the corrosion and deteriorated , such as scaling due to algae and suspended matter erosion, the magnetic float fails due to the fouling barrier formed on it, and the float reed switch water level control method and device also fails

2. The magnetic float and reed switch are only the water level sensing components in the controller, and an additional control circuit must be added to realize its control function

The advantages of this water level control method and device are simple structure, convenient installation, and low cost, but there are serious disadvantages: since the water flows in direct current, the electroplating effect is obvious, the positive electrode is easy to be corroded, and the negative electrode is easy to bond. Dirt, short service life, low reliability

Literature: "200 Examples of Practical Electronic Circuits", edited by Zhang Qingshuang, etc., Mechanical Industry Press, 2003 edition, the seven water level control methods and devices introduced on pages 151-160, all belong to this type of DC electronic water level control method and device , and the existing direct current electronic water level control method and device cannot overcome this defect caused by the use of direct current

[0008] In addition, the above two forms of water level control methods and devices cannot detect whether the water in the container is safely grounded. Therefore, there is a danger of being struck by lightning when used in a roof water tank; electric shock hazard

Images