An online monitoring device for internal leakage of safety valve based on ultrasonic fixed frequency design

Abstract

The invention discloses an ultrasonic fixed-frequency design based online monitoring device for inner leakage of a safety valve. The device comprises a vale rod, a valve seat, an ultrasonic acousticalgenerator, at least one ultrasonic sensor and a signal handling module, wherein a valve blade is mounted at the bottom part of the valve rod; the top part of the valve seat is selectively abutted with the bottom part of the valve blade in a sealing manner; a circular ring shaped air collecting groove is formed in the plane of the top part of the valve seat which is abutted with the valve blade; the air collecting groove is formed in the periphery of the top part of the valve seat; a flow guide channel is formed in the bottom part of the air collecting groove and is connected to the outside ofthe valve body; the ultrasonic acoustical generator which is of a cylindrical empty cavity type acoustical generating structure is connected to an outlet end of the flow guide channel; and a bevel air outlet is formed in the cylindrical wall surface of the ultrasonic acoustical generator; the at least one ultrasonic sensor is arranged right ahead the bevel air outlet; and the signal handling module is connected to the output end of the ultrasonic sensor. With the adoption of the device, small leakage with leakage flow rate lower limit of 1.0L / min can be intelligently monitored and alarmed, so that the inner leakage failure of the safety valve can be controlled in an early stage, and as a result, the economic loss and potential risk caused by a large number of leakage can be avoided.

Description

technical field [0001] The invention relates to the technical field of air tightness testing of structural components, in particular to an on-line monitoring device for internal leakage of a safety valve based on an ultrasonic fixed-frequency design. Background technique [0002] The safety valve is an automatic pressure release device installed on pressure-bearing equipment and gas pipelines. It is the final pressure relief protection device of the production system and the last line of defense for the safety of the production system. When the pressure of the medium in the pressure equipment or the gas pipeline exceeds the "take-off" pressure of the safety valve, the safety valve will automatically open to release the medium. The valve is automatically closed to ensure that the system pressure is maintained within a certain range. In the process industry, especially in nuclear power equipment, the safety level and operational reliability of safety valves are extremely high...

AI Technical Summary

Problems solved by technology

This technical solution can theoretically detect the leakage of the safety valve medium, but there are the following technical deficiencies: the pressure sensor needs to have high sensitivity and a large range to deal with the valve opening condition, and it is difficult for ordinary sensors to meet the requirements ;The pressure change caused by the small leakage condition is very weak, and it is difficult for the pressure sensor to capture the pressure pulsation

This technical solution can realize the detection of the medium leakage of the safety valve, but there are the following technical deficiencies: the high-temperature medium inside the steam safety valve has high requirements for the flow tester; the detection cost of small-flow steam is relatively high, and the current detection lower limit is 2L / min steam flow The estimated price is more than 10,000 yuan; the blocking plate assembly connected to the exhaust port of the safety valve affects the pressure relief and discharge of the safety valve

[0009] To sum up, although the leakage detection methods involved in the above several technical solutions can realize the detection of valve leakage in theory, their own technical deficiencies limit the conditions of use and scope of application.

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