Liquid level detecting circuit, controller and water heater

A liquid level detection and controller technology, which is applied in liquid level indicators for physical variable measurement, fluid heaters, lighting and heating equipment, etc., can solve control failure, liquid level detection electrodes are prone to electrolysis, and liquid level misjudgment And other issues

Inactive Publication Date: 2014-12-17
GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a liquid level detection circuit, which aims to solve the problem that the traditional liqu

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  • Liquid level detecting circuit, controller and water heater
  • Liquid level detecting circuit, controller and water heater
  • Liquid level detecting circuit, controller and water heater

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[0019] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0020] Due to the different water quality and use environment in different regions, the electrodes of the traditional liquid level controller are prone to electrolysis, corrosion, and scaling, which causes misjudgment of the liquid level and leads to control failure. Such as figure 1 As shown, in the embodiment of the present invention, a safety extra-low AC voltage is connected to the detection electrode 110 including the common terminal C0 and the detection terminals C1 to Cn. Generally, an AC voltage of 8 to 12V is connected to the common terminal C0. After on...

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Abstract

The invention applies to automatic control over air conditioners and provides a liquid level detection circuit used for detecting the liquid level in a liquid container and outputting detected liquid level signals to a corresponding control device for controlling water pouring or discharging. The liquid level detection circuit comprises a detection electrode and a signal processing circuit. The detection electrode comprises a common terminal arranged on the bottom of the liquid container and a plurality of detection terminals arranged from the bottom to the top of the liquid container, and safe ultra-low alternating current voltage is connected into the common terminal. The signal processing circuit is connected with the detection terminals and comprises a plurality of output terminals corresponding to the detection terminals, and the signal processing circuit is used for outputting detection waveforms serving as liquid level signals at the corresponding output terminal after receiving the information that detection signals are available at the corresponding detection terminal. Due to the fact that the safe ultra-low alternating current voltage is connected into the detection electrode, the detection electrode is not prone to electrolysis, corrosion and scales, and liquid level error judgment and control failures caused by influences of impurities in a water tank can be avoided.

Description

technical field [0001] The invention belongs to the field of liquid level control, and in particular relates to a liquid level detection circuit, a controller and a controller. Background technique [0002] At present, most ordinary water level controllers collect large DC or AC detection waveforms. When the liquid is not very pure, the electrodes of this controller are easily affected by electrolysis, corrosion, scaling, etc., which greatly shortens the service life of the electrodes. It will also cause misjudgment and failure of liquid level control. Contents of the invention [0003] The purpose of the present invention is to provide a liquid level detection circuit, aiming at solving the problem that the traditional liquid level detection electrode is easy to be electrolyzed, corroded, and scaled, thus causing misjudgment of the liquid level and resulting in control failure. [0004] The embodiment of the present invention is a circuit implemented in this way, which i...

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Application Information

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IPC IPC(8): G01F23/22F24H9/20
Inventor 贺伟衡赵天喜
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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