CN-121994421-A - Blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection

CN121994421ACN 121994421 ACN121994421 ACN 121994421ACN-121994421-A

Abstract

The invention discloses a blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection, which relates to the technical field of valve sealing performance detection and comprises a vacuum detection platform, a detection module and a detection module, wherein a vacuum chamber for accommodating a blind plate valve to be detected is arranged in the vacuum detection platform; and the cold head of the refrigerating device extends into the vacuum chamber and is used for providing a controllable low-temperature environment for the blind plate valve to be tested. According to the blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection, the dynamic clamping force spectrum loading module is integrated, and various periodically-changing dynamic clamping forces such as sine waves, triangular waves or step waves can be applied to the blind plate valve to be detected, so that the dynamic clamping force changing process caused by factors such as temperature fluctuation and pressure impact in an actual pipeline system is simulated, the problem that the traditional static detection cannot capture the clamping force sensitive leakage is solved, the detection result is closer to the actual service working condition of the valve, and the detection rate and the diagnosis accuracy of leakage defects are improved.

Inventors

WANG QI
YANG JIANQIANG
LIU XINGJIE
QI YONGLI

Assignees

河北博雷阀门有限公司

Dates

Publication Date: 20260508
Application Date: 20260316

Claims (10)

1. A blind flange valve micro-leak detection system based on helium mass spectrometer leak detection, comprising: The vacuum detection platform is internally provided with a vacuum chamber for accommodating a blind plate valve to be detected; The cold head of the refrigerating device extends into the vacuum chamber and is used for providing a controllable low-temperature environment for the blind plate valve to be tested; The air supply and distribution device is communicated with the vacuum chamber through an air inlet pipeline and is used for providing helium to the air inlet side of the blind plate valve to be tested; the first helium mass spectrometer leak detector is communicated with the vacuum chamber and is used for detecting helium partial pressure in the vacuum chamber to obtain the leak rate of the blind plate valve to be detected; The second helium mass spectrometer leak detector is communicated with the air outlet side of the blind plate valve to be detected through an air outlet pipeline and is used for detecting the helium amount leaked to the air outlet side through the blind plate valve to be detected so as to obtain an internal leakage rate; The dynamic clamping force spectrum loading module comprises a servo motor, a cam-connecting rod mechanism and a clamping execution end, wherein the clamping execution end is in contact with a valve body or a valve plate of the blind plate valve to be tested, and the servo motor drives the cam-connecting rod mechanism to drive the clamping execution end to move so as to apply periodically-changed dynamic clamping force to the blind plate valve to be tested; The large-caliber concentric double-stage sealing quick-connection device is arranged at the connecting ends of the air inlet pipeline, the air outlet pipeline and the blind plate valve to be tested and comprises an air bag expansion type thick sealing ring and a metal C-shaped ring precise sealing ring, and the air inlet pipeline and the air outlet pipeline are integrated with a concentrically arranged blowing ring and a sampling ring inside the connecting ends; The data processing unit is in communication connection with the first helium mass spectrometer leak detector, the second helium mass spectrometer leak detector and the dynamic clamping force spectrum loading module; the data processing unit comprises a three-level progressive data cleaning module and a double-verification closed-loop detection module; the three-stage progressive data cleaning module is used for sequentially performing time domain denoising, background dynamic deduction and leakage point space positioning processing on original leakage signals output by the first helium mass spectrometer leak detector and the second helium mass spectrometer leak detector to generate cleaned leakage data; The double-verification closed-loop detection module is used for carrying out first verification on the washed leakage data, outputting a detection result if the first verification passes, triggering a re-verification cycle if the first verification fails, carrying out correlation analysis on the detection result and the loading parameters of the dynamic clamping force spectrum loading module, correcting the processing parameters subjected to background dynamic deduction according to the analysis result, and re-inputting the corrected parameters into the three-level progressive data washing module for cycle calculation until a preset convergence condition is met.
2. The helium mass spectrometer leak detection-based blind plate valve micro-leak detection system of claim 1, wherein a cam-link mechanism of the dynamic clamping force spectrum loading module is arranged outside the vacuum chamber, the clamping execution end extends into the vacuum chamber through a magnetic fluid sealing shaft, and the servo motor drives the cam-link mechanism according to a preset programming control signal so as to generate at least one of a sine wave clamping force spectrum, a triangular wave clamping force spectrum or a step wave clamping force spectrum.
3. The blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection according to claim 2, wherein the dynamic clamping force spectrum loading module further comprises a clamping force sensor, the clamping force sensor is arranged on a contact surface between the clamping execution end and the blind plate valve to be detected, the clamping force sensor is in communication connection with the data processing unit and is used for feeding back clamping force signals acquired in real time to the data processing unit, and the data processing unit adjusts driving parameters of the servo motor according to deviation of the clamping force signals and the preset programming control signals.
4. The blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection is characterized by further comprising an air bag inflation control valve and an air source, wherein the air bag inflation control valve is of a hollow annular structure and is connected with the air source and the air bag inflation coarse sealing ring and used for inflating the air bag inflation coarse sealing ring after the connecting end is in butt joint with a flange of a blind plate valve to be detected, so that the air bag inflation coarse sealing ring is inflated and is attached to the inner wall of the flange to form coarse sealing, the metal C-shaped ring precise sealing ring is arranged on the radial inner side of the air bag inflation coarse sealing ring, and the metal C-shaped ring precise sealing ring is pressed by a pressing mechanism after the coarse sealing is formed to form precise sealing.
5. The blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection of claim 4 is characterized in that the injection ring is of an annular tubular structure arranged around the inner wall of the air inlet pipeline, a plurality of injection holes are formed in one side, facing the blind plate valve to be detected, of the injection ring, the injection ring is communicated with the air supply and distribution device, the sampling ring is of an annular tubular structure arranged around the inner wall of the air outlet pipeline, a plurality of sampling holes are formed in one side, facing the blind plate valve to be detected, of the sampling ring, the sampling ring is communicated with the second helium mass spectrum leakage detector, and the injection ring and the sampling ring are concentrically arranged and located on the radial inner side of the injection ring.
6. The blind plate valve micro-leakage detection system based on helium mass spectrometer leak detection of claim 1, wherein said three-stage progressive data cleaning module comprises: The time domain denoising module is used for carrying out wavelet transformation processing on the original leakage signal, decomposing the original leakage signal into components of a plurality of frequency bands, identifying and removing mechanical vibration noise components related to the loading frequency of the dynamic clamping force spectrum loading module, and carrying out wavelet reconstruction on the residual components to generate a denoised signal; The system comprises a vacuum chamber, a background dynamic deduction module, a noise-removing signal acquisition module and a noise-removing signal acquisition module, wherein the background dynamic deduction module is in communication connection with a laser Raman spectrum gas analyzer which is arranged in the vacuum chamber or on the gas outlet pipeline and is used for detecting the air background component concentration and the residual helium concentration in the surrounding environment gas of the blind plate valve to be detected in real time; The system comprises a space positioning module, a multi-path injection ring control valve and a cleaning module, wherein the space positioning module is in communication connection with the multi-path injection ring control valve, the multi-path injection ring control valve is used for controlling the injection ring to sequentially or combined inject helium along different sealing areas of a blind plate valve to be tested, a blind source separation algorithm is arranged in the space positioning module, the blind source separation algorithm takes subtracted signals output by a first helium mass spectrometer leak detector and a second helium mass spectrometer leak detector under different injection time sequences as mixed signals, independent leakage source signals corresponding to different sealing areas are separated, and cleaning leakage data are generated according to the independent leakage source signals.
7. The blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection of claim 6, wherein the laser Raman spectrum gas analyzer comprises a laser light source, a spectrum acquisition probe and a spectrum analysis module, wherein the spectrum acquisition probe is arranged in the vacuum chamber and faces to a plurality of sealing surfaces of the blind plate valve to be detected, and the spectrum analysis module is used for identifying the concentration of nitrogen, oxygen, water vapor and helium according to the acquired Raman spectrum characteristic peaks.
8. The blind valve micro-leakage detection system based on helium mass spectrometer leak detection of claim 6, wherein said dual verification closed loop detection module comprises: The first primary verification unit is used for comparing the quantitative leakage rate of helium corresponding to the cleaned leakage data with the gas components detected by the laser Raman spectrum gas analyzer, and if helium exists in the cleaned leakage data and other trace gas components except the air background component are detected at the same time, or the quantitative leakage rate of helium is not matched with the change trend of the residual helium concentration, judging that the first verification is not passed, and triggering a re-detection circulation instruction; And the second verification unit is used for carrying out correlation analysis on the quantitative leakage rate of the helium and the frequency and amplitude of the dynamic clamping force currently applied by the dynamic clamping force spectrum loading module after the first verification is passed, if the analysis result shows that the quantitative leakage rate of the helium exceeds a preset dynamic leakage threshold under the specific clamping force condition, correcting the model parameters of the background dynamic attenuation model according to the corresponding relation between the quantitative leakage rate of the helium and the specific clamping force condition, and sending the corrected model parameters to the background dynamic deduction module as new input parameters and triggering a circulation calculation instruction.
9. The blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection is characterized in that the double-verification closed-loop detection module further comprises a cycle convergence judging unit, wherein the cycle convergence judging unit is used for receiving updated leakage data generated after being recalculated by the background dynamic deduction module, calculating a deviation value between the updated leakage data and the washed leakage data which are circularly output last time, stopping the cycle calculation and outputting a final detection result when the deviation value is smaller than a preset convergence threshold, and continuously triggering the second verification unit to execute model parameter correction and cycle calculation when the deviation value is larger than or equal to the convergence threshold.
10. The blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection of claim 9, further comprising a precooling device, wherein the precooling device comprises a heat exchange cavity and a coil arranged in the heat exchange cavity, the coil is formed in the middle section of the air inlet pipeline and immersed in a heat exchange medium in the heat exchange cavity, and the heat exchange cavity is provided with a medium inlet and a medium outlet for precooling helium in the air inlet pipeline by introducing liquid nitrogen.

Description

Blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection Technical Field The invention relates to the technical field of valve sealing performance detection, in particular to a blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection. Background The blind plate valve is used as a key cutting device widely applied to the industrial fields of metallurgy, chemical industry, petroleum, electric power and the like, and is mainly used for reliably isolating gas or liquid media in a pipeline system. Along with the continuous improvement of the requirements of industrial production on safety and environmental protection, particularly relates to a conveying system of toxic, inflammable, explosive or high-purity media, and the sealing performance of a blind plate valve is directly related to the safe operation and environmental protection of the whole production flow. The micro leakage is not only a source of energy waste, but also more likely to cause serious safety accidents. Therefore, the high-precision micro-leakage detection of the blind plate valve, especially the detection under the simulated actual working condition, has become an important link for guaranteeing the industrial safety and the equipment reliability. At present, the detection method for the valve sealing performance is various, the leak detection technology under the normal temperature condition is relatively mature, and the rough judgment can be carried out by adopting a bubble method, a pressure drop method, a flowmeter method and the like. However, the above conventional methods have significant drawbacks in terms of sensitivity, quantitative analysis capability, and interference immunity for the detection requirements of micro-leakage levels. Helium mass spectrometry leak detection method has become the mainstream technology of high-precision leak detection because of the advantages of high sensitivity, high response speed, low helium background, no pollution to the atmosphere and the like. For example, the grant publication number CN110082046a describes a "valve low-temperature leak detection system and leak detection method", and the system uses a refrigeration device to provide a cold source, and combines with a helium mass spectrometer leak detector to realize accurate detection of internal leakage and external leakage of a valve in an adjustable low-temperature environment, so that the dependence of a traditional low-temperature leak detection mode on dangerous media such as liquid hydrogen is solved, the safety and reliability of a test are improved, and simultaneous detection and accurate temperature control of multiple valves are realized. Although the patent has significantly advanced in the field of low-temperature leakage detection of valves, and has the advantages of high system integration level, good detection precision, safety and reliability, the structural design and the detection flow are mainly aimed at the universality detection of a conventional valve in a low-temperature environment, and the suitability of the valve to a specific valve type of a blind plate valve is still to be optimized. The blind plate valve generally has a larger drift diameter and a special sealing structure, the clamping and loosening actions of the blind plate valve are greatly different from those of the common valve, and no specific solution is provided by the existing system for effectively simulating the actual working state of the blind plate valve, conveniently connecting a large-caliber pipeline and rapidly realizing the opening and closing operation of the valve in the detection process. In addition, when the prior art is used for carrying out micro leakage detection on a blind plate valve, complicated pipeline transformation and long installation time are often required, the detection efficiency is low, and the requirement of industrialized rapid batch detection is difficult to meet. Therefore, the micro leakage detection system which is specially aimed at the structural characteristics of the blind plate valve, is convenient to operate and high in detection precision is developed, and has important practical significance and application value. Disclosure of Invention The invention aims to provide a blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection, which aims to solve the problems in the background technology. In order to solve the technical problems, the invention provides a blind plate valve micro-leakage detection system based on helium mass spectrum leakage detection, which comprises the following steps: The vacuum detection platform is internally provided with a vacuum chamber for accommodating a blind plate valve to be detected; The cold head of the refrigerating device extends into the vacuum chamber and is used for providing a controllable low-temperature environment for the blind plate valve to be teste