SU1508117A2 - Apparatus for detecting a leak - Google Patents

Abstract

The invention relates to the monitoring of the leaktightness of products by an acoustic method and makes it possible to increase the reliability by preventing false positives of the device for leak detection. The acoustic transducer unit 2, the switching unit 3, the amplification, filtering and shaping unit 4, the correlation function determining unit 5 and the informative parameter associated with it, the alarm generation unit 6 and the alarm unit 7 are connected in series. The control unit 1 is connected to the inputs of the blocks 5.6. The integrator 8, comparison block 9, threshold setting block 10 and break signaling block 11 introduced into the device provide detection of breaks in the signal conductors from block 2 of acoustic transducers with indication of the address of the acoustic transducer. 1 il.

Description

The invention relates to the monitoring of the leaktightness of products by an acoustic method and can be used to detect the emergency condition of the tubes of steam generators of atomic reactors with liquid metal coolant arising from the leakage of water into sodium, and is an improvement to auth. No. 1254854.

The purpose of the invention is to increase the reliability by preventing false alarms of the leak detection device.

The drawing shows a leak detection pattern.

The device for detecting a leak comprises a control unit 1, a unit 2 of acoustic transducers, a switching unit 3, a gain unit 4, filtering and shaping, a correlation function determining unit 5 and an informative parameter associated with it, an alarm generation unit 6, a three alarm unit 7 -, vogi, integrator 8, comparison unit 9, threshold setting unit 10, dips signaling unit.

The output of acoustic transducer unit 2 is connected to the first input of switching unit 3, the second input of which is connected to the seventh output of control unit 1, and the output is connected to the second input of integrator 8 and to the input of amplifier 4, filtering and shaping, the output of which is connected to the first the input of the block 5 for determining the correlation function and the informative parameter associated with it, the second, third and fourth inputs of which are connected respectively to the first.

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the second and the third outputs of the control unit 1, and the input is connected to the first input of the alarm generation unit 6, the second, third, fourth and fifth inputs of which are connected respectively to the fourth, fifth, sixth and seventh outputs of the control unit 1, and the output The alarm generation unit 6 is connected to the first input of the alarm unit 7, the second input of which is connected to the output of the block 9 and to the first input of the signaling unit 11, the second input of which is connected to the seventh output of the control unit 1, the eighth section of the control unit 1 It is connected to the first input of the integrator 8, the output of which is connected to the first input of the comparison unit 9, the second input of which is connected to the output of the threshold setting unit 10.

The device works as follows.

The signals from the output of the acoustic transducer unit 2 are fed to the first input of the switching unit 3, in which they switch from the next interrogated acoustic transducer whose address comes from the seventh output of the control unit I to the second input of the switching unit 3. In block 4 amplification, filtering and shaping the signals are amplified, filtered and formed, and then fed to the first input of block 5 for determining the correlation function and the informative parameter associated with it, which determines the value proportional to the tangent of the sign angle of the autocorrelation functions. In the alarm generation unit 6, an alarm signal is generated that arrives at the first input of the alarm signaling unit 7. Information control from acoustic transducers took place sequentially in time, with the contents of each acoustic transducer being analyzed for 0.2 s. At the beginning of the analysis of each acoustic transducer, the integrator 8 is reset.

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to zero by the signal received at its first input from the eighth output of control unit 1. Then, within 0.2 seconds, the second input of the integrator 8 from the output of the switching unit 3 receives a signal that accumulates on the integrator 8, characterizing the average amplitude level of the signal from the acoustic transducer, which is being analyzed at that time. The signal from the output of the integrator 8 is fed to the first input of the comparison unit 9 and is compared with the threshold value fed to the second input of the comparison unit 9 from the output of the threshold setting unit 10. If the amplitude value of the signal from the output of the integrator 8 becomes less than the threshold, then the output of the comparison block 9 receives a signal at the first input of the break signaling unit 11 and enables the break alarm and the address indication. an acoustic transducer supplied to the second input of the breakdown signaling unit I1 from the seventh output of the control unit 1. Signal coming. The driver from the output of the comparison unit 9 to the second input of the alarm signaling unit 7 prohibits the alarm signaling if it was generated by the alarm generation unit 6.

Claims (1)

Formula invented Leak Detection Device St. No. 1254854, whether it is in order to increase reliability, it is equipped with an integrator, the first input of which is connected to the eighth output of the control unit, and the second to the output of the switching unit, comparison unit, the first input which is connected to the integrator output, and the output is connected to the second input of the alarm signaling unit, the threshold setting unit, the output of which is connected to the second input of the comparator unit, and the open signaling unit, the first input of which is connected to the output of the comparator unit, and the second to the seventh output of the unit management