Float switch

Abstract

The invention relates to a float switch formed by assembling nuts, a support rod, a nylon-knitted flexible wire, a spiral electric wire, a heat-shrinkable tubing, a floater, a ball switch (or mercury switch), a shield and an installation seat. The floater floats up and down through the function of liquid floatage so that the ball switch (or the mercury switch) is switched on or switched off, thereby obtaining a liquid level switch having the advantages of wide adaptability, safety and reliability, simple maintenance, smaller size, lower cost, long service life, simpler electronic control line, no influences of ferromagnetic impurities in liquid, the resistance change of the liquid and the transparency of the liquid and no electromagnetic interference from the outside.

Description

Technical field [0001] The invention relates to a liquid level switch for automatically controlling the height of liquid in a container. Background technique [0002] It is well known that automatic liquid level control is required in many containers. Traditional liquid level switches mainly include magnetic float type, cable float type, conductance type, photoelectric type, tuning fork type, ultrasonic type, capacitive type and radio frequency admittance type. Traditional liquid level switches have the following defects: [0003] 1. The magnetic float type liquid level switch cannot be used in the liquid containing ferromagnetic impurities. After the ferromagnetic impurities in the liquid are adsorbed on the magnetic float, the magnetic float will not be able to float up and down with the liquid level, resulting in failure of control. [0004] 2. The cable float type liquid level switch has a large volume and high cost. [0005] 3. The electronic control circuit of the c...

AI Technical Summary

Problems solved by technology

[0003] 1. The magnetic float type liquid level switch cannot be used in the liquid containing ferromagnetic impurities. After the ferromagnetic impurities in the liquid are adsorbed on the magnetic float, the magnetic float will not be able to float up and down with the liquid level, causing the control to fail.

[0004] 2. The cable float type liquid level switch is larger in size and higher in cost

[0005] 3. The electronic control circuit of the conductivity type liquid level switch is complicated, and it is easy to lose control in the liquid with large resistance change, and it will be damaged by short circuit in the liquid with too small resistance

[0006] 4. The electronic control circuit of the photoelectric liquid level switch is complicated, and the transparent surface of the glass needs to be cleaned and maintained frequently during use. It is easy to lose control when used in liquids with low transparency and many impurities.

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