An online leak detection device for a steam safety valve

Abstract

The invention relates to an online leakage detection device for a steam safety valve, and belongs to the field of test field. An ultrasonic wave generator is arranged on a lower adjusting ring of the steam safety valve, an ultrasonic wave probe is arranged on a steam outlet pipeline of the steam safety valve, a signal collector and a computer where frequency spectrum / amplitude display analysis software is installed are arranged, and the signal output end of the ultrasonic wave probe is correspondingly connected with the signal input end of the computer. When the steam safety valve leaks steam, the leaked steam flows through the ultrasonic wave generator to generate ultrasonic waves at fixed frequency, and after detecting the ultrasonic waves generated by the ultrasonic wave generator, the ultrasonic wave probe outputs signals; whether the ultrasonic wave signals at fixed frequency or not are obviously enhanced on the computer is observed, or whether amplitude of the ultrasonic wave signals at fixed frequency exceeds a preset value or not is judged to safely and remotely judge whether the steam safety valve leaks or not online in real time. The online leakage detection device can be widely applied to the field of online leakage detection of steam safety valves of various specifications and sizes.

Description

Technical field [0001] The invention relates to the field of testing the fluid tightness of structural components, in particular to an online leak detection device for a steam safety valve. Background technique [0002] The steam safety valve is an automatic pressure release device installed on the steam pipeline. When the pressure of the medium (steam, the same below) in the pipeline exceeds the "opening pressure" of the safety valve (also known as the "take-off" pressure of the safety valve), the safety valve automatically opens to release the medium to prevent overpressure explosion in the pipeline; When the pressure of the medium in the pipeline drops to the closing pressure of the safety valve (also known as the "return to seat" pressure of the safety valve), the safety valve is automatically closed to ensure the normal progress of production activities. [0003] In thermal power equipment, especially nuclear power equipment, the safety level and operational reliability of sa...

AI Technical Summary

Problems solved by technology

However, the shortcomings are that the ultrasonic frequency generated when the valve leaks is not fixed, the interference of environmental noise is relatively large, and the detection accuracy is relatively low.

[0009] The principle of acoustic emission involved in the above two technical solutions is that the leakage medium acts on the valve internals to excite ultrasonic waves and detect them. The disadvantage of the valve leakage detection method based on acoustic emission is that the leakage rate needs to be re-calibrated for different valves. There will be different leakage signal amplitude spectra in the leakage rate, so its use conditions and scope of application are limited to a certain extent

Images