A leak detection sensor

Abstract

The invention belongs to the technical field of leakage detection, and in particular relates to a leakage detection sensor. Existing water leakage detection equipment will cause detection failure due to the polarization of the detection electrodes, and cannot detect micro-leakage at the initial stage of leakage, and cannot expand the monitoring range through the cascade of detection electrodes. The leak detection sensor provided by the present invention includes several sensing electrodes connected by wires and a detection signal processing circuit, the sensing electrodes adopt a flat plate structure, and the sensing electrodes can be cascaded through the wires , an alternating voltage is applied to the sensing electrodes. Since the sensing electrodes are loaded with alternating voltage, there will be no polarization phenomenon and the response is sensitive. It can give an alarm for the slight leakage in the early stage of leakage, and the number of sensing electrodes can be increased by cascading the sensing electrodes to expand Detection range for leaks.

Description

technical field [0001] The invention belongs to the technical field of leakage detection, and in particular relates to a leakage detection sensor. Background technique [0002] The patent application whose publication number is CN204422154U titled "a kind of water leakage detection module" (application date: January 26, 2015, announcement date: June 24, 2015) discloses a water leakage detection device. The composition of the water leakage detection module is as follows: electrode A is directly connected to the power supply, electrode B is connected to the power supply and ground respectively through RT and R3; the inverting input terminal of comparator ICA1 is connected to the power supply and ground respectively through R1 and R6, and the positive phase Terminal is directly connected to electrode B. When immersed in water, the weak current signal generated by electrode B passes through the comparator ICA1 and outputs a water leakage signal. First of all, according to the ...

AI Technical Summary

Problems solved by technology

First of all, according to the signal output by the electrodes, only when the water leakage reaches a certain level, the electrodes can conduct in the water and drive the comparator ICA1, but the initial slight water leakage cannot be detected in time; secondly, the RT and R3 will attenuate the electrode output signal, resulting in the inability to detect the leakage of liquid with low conductivity; finally, according to the circuit connection relationship described in the patent application, that is, electrode A and electrode B are connected to the power supply with fixed polarity for a long time , resulting in the polarization of the two electrodes in a short period of time after the water leakage occurs, so that the water leakage detection module fails

[0003] The publication number is CN204044543U, and the patent application (application date July 17, 2014, announcement date December 24, 2014) titled "Water Purifier Leakage Detection Circuit" discloses a water leakage detection circuit, which also exists due to water leakage. Polarization of the detection board, weak output signal of the water leakage detection board, resulting in insufficient signal to drive the transistor Q1, thus making the water leakage detection invalid

[0004] Moreover, this type of sensor cannot be cascaded in the prior art, and when an accidental water leak occurs at any point in most water purification equipment, the leaking water flows through different points, so it is necessary to install leak detection sensors at multiple points

Reliable detection of water leakage in water-making equipment cannot be realized due to the inability of the existing sensors to be cascaded

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