Novel piezoelectric liquid level switch

Abstract

The invention discloses a novel piezoelectric liquid level switch which comprises a sensing part and a detection part connected through leads. The sensing part comprises a casing with an opening at the lower end, a vibrating reed is mounted at the opening of the casing, a piezoelectric ceramic piece is attached on the inner surface of the vibrating reed. The detection part comprises an operation amplifier. Two semicircular silver conductive layers are plated on the upper end face of the piezoelectric ceramic piece, one of the two semicircular silver conductive layers is connected with a back-phase input end of the operation amplifier, and the other one is connected with an output end of the operation amplifier. The novel piezoelectric liquid level switch comprises the sensing part and the detection part which are connected through the leads, the sensing part is small in size and flexible in connection mode. Further, the novel piezoelectric liquid lever switch is high in impact resistance and free of affection of density, viscosity and electric characteristics of liquid media and affection of pollutant and vortex, thereby being applicable to more media.

Description

technical field [0001] The invention relates to the technical field of liquid level monitoring devices, in particular to a piezoelectric liquid level switch. Background technique [0002] At present, the common types of liquid level switches are float type, magnetic type and photoelectric type. Among them, float type liquid level switch, magnetic type liquid level switch and photoelectric liquid level switch are widely used. The float type liquid level switch uses the float to move up and down with the water level to make the contacts open and close to achieve the purpose of automatic control. However, the control has a complex structure, requires components such as a long shaft and a mounting frame, is difficult to install, has a large volume, a fixed liquid level control range, and slightly poor stability. The magnetic liquid level switch is designed and produced by using the principle of buoyancy and static magnetic field. The position of the float with magnet in the mea...

AI Technical Summary

Problems solved by technology

However, the mechanism of this liquid level switch is relatively complicated, the volume is large, the control liquid level cannot be adjusted, and the installation is complicated

The photoelectric liquid level switch uses the principle of photoelectric effect. When the liquid level is submerged in the liquid level switch, its photosensitive element is triggered to detect the liquid level. However, the prism of the liquid level switch is easily damaged, and it is easily False alarm, unreliable work

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