Liquid level switch with hysteresis function

Abstract

The invention discloses a liquid level switch with a hysteresis function. The liquid level switch comprises a mechanical device and a hysteresis control circuit. The mechanical device comprises a blank pipe strut, a threaded cover is arranged at the upper end of the blank pipe strut, and a sealing cover is arranged at the lower end of the blank pipe strut; the blank pipe strut is fixed at the upper end of a container through the threaded cover; a normally-closed reed pipe and a normally-open reed pipe are arranged in the blank pipe strut; a clamp spring is arranged on the surface of the blank pipe strut; the blank pipe strut is sleeved with a floater, and magnetic steel is arranged in the floater; when the floater moves, combination of the magnetic steel and the normally-closed reed pipe or the normally-open reed pipe is used as input signals of the hysteresis control circuit, a hysteresis region is formed between the normally-closed reed pipe and the normally-open reed pipe, and the hysteresis effect is achieved in water injection and drainage or liquid level indication of the container. The liquid level switch does not frequently change actions along with shaking of liquid within a certain range, and safe working voltage is adopted.

Description

technical field [0001] The invention relates to the field of liquid level sensors, in particular to a liquid level switch with a hysteresis function which does not frequently change its action as the liquid shakes within a certain range. Background technique [0002] The liquid level switch is used to realize the detection of the liquid level height, which is widely used in water treatment, household appliances, automobiles and other fields, such as the detection of the liquid level height in the water tank of the purified water treatment system, and the liquid level detection in the automobile; the existing liquid level switch The level switch generally uses a switch signal to detect the height of the liquid level. In the actual application process, the liquid level signal output signal fluctuates due to the shaking of the liquid level; if the existing liquid level switch is used to control the action of the water pump, it will The injection of water during the process will...

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Problems solved by technology

[0002] The liquid level switch is used to realize the detection of the liquid level height, which is widely used in water treatment, household appliances, automobiles and other fields, such as the detection of the liquid level height in the water tank of the purified water treatment system, and the liquid level detection in the automobile; the existing liquid level switch The level switch generally uses a switch signal to detect the height of the liquid level. In the actual application process, the liquid level signal output signal fluctuates due to the shaking of the liquid level; if the existing liquid level switch is used to control the action of the water pump, it will The injection of water during the process will cause the liquid level to sway, causing the pump to perform frequent on and off actions, shortening the life of the switch and the pump, and forming a certain interference to the power grid; if the existing liquid level switch is used to indicate the height of the liquid level, Due to the sloshing of the liquid in the container, the signal indication of the liquid level is sometimes absent, making the indication of the liquid level unclear.

If the existing liquid level switch is used to work with mains power, when the shell of the liquid level switch is damaged, there will be a hidden danger of charging the liquid in the container. For this reason, we have developed a device that does not change its action frequently with the liquid shaking within a certain range. , a liquid level switch with hysteresis function using a safe working voltage

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