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Electronic water level controller

A controller and electronic technology, applied in the direction of liquid level control, non-electric variable control, control/regulation system, etc., can solve the problems of water level control system control error, system failure, affecting the up and down movement of the float, etc.

Inactive Publication Date: 2011-12-07
HAIMEN THE YELLOW SEA ENTREPRENEURSHIP PARK SERVICE CO LTD
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Problems solved by technology

The disadvantage of this kind of float switch is: the viscous scale in the water will affect the up and down movement of the float, causing control errors in the water level control system
However, the DC control method has the following problems: 1. Electroplating effect: the positive electrode is continuously consumed in the water; 2. Non-conductive scale will form on the negative electrode, making the system malfunction; 3. The positive electrode will release metal ions into the water, affect water quality

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the description here does not constitute a limitation to the protection scope of the present invention.

[0040] Figure 5 It is the schematic circuit diagram of the first embodiment of the present invention. Such as Figure 5 As shown, AC220V as the source of the water level detection signal is introduced through the neutral line N→earth→ground electrode ( Figure 5 , the dotted line between the middle lines N and E represents the earth).

[0041] When the water level is lower than D, it means that the signal source for detection is disconnected. At this time, I D , I 4 , I G , I 3 are all zero, and U D = 0, U G =0. Voltage comparator IC 1 , IC 2 1 terminals of both are low level, switching transistor V 1 , V 2 Both cut off, relay J G 、J D No current flows, their respective normally closed contacts K G 、K D Both...

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Abstract

The invention relates to an electronic water level controller. In the invention, utility alternating current supplies power voltage for an execution circuit after being subjected to voltage reduction by a voltage reduction circuit, filtered and stabilized by a filtering and stabilizing circuit; a standard water level is set in a heating container in advance, when the water level of the heating container is higher than or lower than the preset standard water level, a sampling and alternating current balancing circuit acquires the signal current of a sampling electrode and sends the signal current to a control signal acquisition circuit; the control signal acquisition circuit converts the current into control voltage and sends the control voltage to the execution circuit; and the execution circuit carries out on or off operation on a heating switch of the system, wherein the used utility alternating current can be AC220V 50Hz alternating current.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to an electronic water level controller. Background technique [0002] The water level controller is a widely used automation device. It has a large number of applications in industrial circulating water, sewage treatment, food processing, chemical industry, automobile industry, solar water heater and other fields. The water tank is used to control the water level of the water tank. [0003] Known water level control methods mainly contain two kinds: one is a float switch, which utilizes the float to move up and down mechanically with the height of the water level to control the water level. The disadvantage of this float switch is that the viscous scale in the water will affect the up and down movement of the float, causing control errors in the water level control system. [0004] The other is the direct current water level control system, which uses a transformer to s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D9/12
Inventor 汪孟金李玮孙浙胜朱亮
Owner HAIMEN THE YELLOW SEA ENTREPRENEURSHIP PARK SERVICE CO LTD
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