CN-121977816-A - Intelligent monitoring and state evaluating system for seal abrasion of hemispherical valve

CN121977816ACN 121977816 ACN121977816 ACN 121977816ACN-121977816-A

Abstract

The invention relates to the technical field of intelligent monitoring of industrial valves, in particular to an intelligent monitoring and state evaluation system for sealing abrasion of a hemispherical valve, which is characterized in that the operation phase of the opening and closing process of the hemispherical valve is divided, the sealing monitoring is organized in the operation phase of forming stable sealing contact between a valve core and a sealing surface, and the operation parameters directly related to the sealing contact behavior are acquired by adopting corresponding data acquisition modes according to different operation phases; the method comprises the steps of constructing a seal response characteristic section with definite physical significance by carrying out staged processing on collected data, and identifying a seal contact leading state and a change relation thereof in a plurality of operation periods; based on the continuous characteristic of the main seal response characteristic section in the continuous operation period and the space migration condition thereof, the comprehensive evaluation is carried out on the sealing abrasion state of the half ball valve, and the operation evaluation and maintenance decision capability of the sealing state of the half ball valve is greatly improved.

Inventors

ZHAO DONGDONG
ZHAO GUOHUA
GAO QINGQIAN
SONG HAO
WANG HUANYU

Assignees

河南盛誉实业有限公司

Dates

Publication Date: 20260505
Application Date: 20260131

Claims (10)

1. A hemispherical valve seal abrasion intelligent monitoring and state evaluating system is characterized by comprising the following components: The monitoring organization module is used for dividing the opening and closing process of the half ball valve into a plurality of operation phases with different structural stress characteristics and generating a monitoring trigger signal based on the operation phases; The system comprises a state analysis module, a migration identification unit and a migration identification unit, wherein the state analysis module is used for analyzing sealing states in different operation stages and comprises a multi-state acquisition unit, a segmentation construction unit, a leading judgment unit and a migration identification unit, the multi-state acquisition unit is used for acquiring relevant sealing operation parameters in the operation stages corresponding to all monitoring trigger signals and forming a plurality of groups of sealing response data sets according to the operation stages; And the state evaluation module is used for evaluating the sealing abrasion state of the half ball valve according to the dominant sealing response characteristic section and the corresponding migration relation thereof and outputting an evaluation result.
2. The intelligent monitoring and state evaluating system for sealing abrasion of a hemispherical valve according to claim 1, wherein the monitoring organization module comprises an action dividing unit and a trigger control unit, the action dividing unit is used for dividing actions of sealing contact behaviors in the moving process of the valve core based on angular displacement change parameters of the valve core relative to a valve body in the opening and closing process of the hemispherical valve in combination with synchronous response characteristics of pressure change parameters in a sealing cavity, and the dividing method comprises the following steps: When the valve core angular displacement continuously changes and the pressure change of the sealing cavity does not form a stable response, judging that the valve core is in non-sealing contact with the action section; when the valve core angular displacement changes along with the pressure response of the sealing cavity body is changed from an unstable state to a continuously changing state, determining an initial sealing contact action section; When the angular displacement of the valve core enters a low-speed change zone and the pressure change of the sealing cavity is kept continuously consistent, judging that the valve core is in stable sealing contact with the action section; The trigger control unit is used for controlling the starting and stopping of the seal monitoring task according to the dividing result of the action dividing unit, and the trigger control unit only maintains the execution of the seal monitoring task in the stable seal contact action section.
3. The intelligent monitoring and state evaluating system for sealing abrasion of a hemispherical valve according to claim 1, wherein the polymorphic collecting unit collects the relevant operation parameters once based on the corresponding collecting mechanism of the operation stage after receiving the monitoring trigger signal of the corresponding operation stage each time, and generates a group of sealing response data sets corresponding to each collection organization, and the collection organization process comprises: in the initial sealing contact stage, a continuous acquisition method is adopted to acquire pressure change parameters of a sealing cavity and valve core motion parameters, the continuous acquisition method triggers sampling based on parameter change events in an acquisition window, and a fixed time interval is not set between two adjacent sampling; In a stable sealing contact stage, a fixed time interval acquisition method is adopted to acquire pressure change parameters of a sealing cavity and valve core motion parameters, and the fixed time interval acquisition method is based on an internal clock and periodically samples according to a preset sampling period; and based on the operation stage to which the acquisition mode belongs, stage identification is carried out on the acquired parameter data and the acquired parameter data are stored independently, so that a sealing response data set is generated.
4. The intelligent monitoring and state evaluating system for sealing abrasion of a hemispherical valve according to claim 1, wherein the segment construction unit constructs a sealing response characteristic segment by performing joint constraint processing based on time distribution characteristics and stability characteristics on each sealing response data set, and the processing process comprises: constructing a parameter change sequence for seal related operation parameters arranged in time sequence in a seal response data set, and calculating a change rate function between adjacent sampling points, wherein a calculation formula is as follows: Wherein, the Indicating time of day The corresponding seal-related operating parameter values, Representing the rate of change of the parameter between adjacent sampling points; Identifying a position where the change rate continuity is interrupted in the parameter change sequence based on the change rate function, and determining a continuous interval of which the change rate continuity meets a preset condition as a candidate time interval; And in each candidate time interval, carrying out stability analysis on the fluctuation amplitude of the operation parameters related to the seal, and determining the candidate time interval as a seal response characteristic section when the fluctuation amplitude of the parameters in the candidate time interval is consistent within a preset tolerance range, wherein the boundary of the seal response characteristic section is simultaneously limited by a parameter change rate continuity break point and a stability constraint, and in the same seal response data set, no time overlapping occurs between different seal response characteristic sections.
5. The intelligent monitoring and state evaluating system for seal wear of a hemispherical valve according to claim 4, wherein the segment construction unit determines whether the candidate time interval constitutes a seal response characteristic segment by performing joint calculation on multi-parameter stability characteristics of seal related operation parameters when performing stability analysis on the candidate time interval, and the process comprises: Respectively acquiring time sequences of pressure change parameters and valve core motion parameters of the sealing cavity in a candidate time interval, calculating the mean value and standard deviation of the parameter sequences, and evaluating the amplitude stability; Constructing a parameter change rate sequence based on a change rate function, and judging the stability of the parameter change rate through a root mean square value of the change rate; Obtaining a change trend slope through linear fitting of a parameter sequence in a candidate time interval, calculating trend difference of a pressure parameter and a valve core motion parameter, and evaluating change trend consistency; Comprehensively generating a stability index according to the amplitude stability, the change rate stability and the trend consistency The formula expression is: Wherein, the As a standard deviation of the pressure parameter, Is the average value of the pressure parameter, Is the standard deviation of the motion parameters of the valve core, Is the average value of the motion parameters of the valve core, As the slope of the pressure change trend, Is the slope of the movement change trend of the valve core, For the scale-up normalization coefficient, The stability contribution of different parameters is balanced by the weight coefficient; when the comprehensive stability index is And when the candidate time interval is continuously kept in the preset stability threshold range, judging that the candidate time interval meets the stability constraint condition, and maintaining the candidate time interval as a sealing response characteristic section.
6. The intelligent monitoring and state evaluating system for sealing abrasion of a hemispherical valve according to claim 5, wherein the segment construction unit constructs the corresponding sealing contact leading state of the sealing response characteristic segment based on the parameter change rate sequence in the sealing response characteristic segment after finishing boundary determination and stability confirmation of the sealing response characteristic segment, and the process comprises the following steps: Dividing the parameter change rate into intervals according to a preset amplitude interval in each sealing response characteristic section, and respectively calculating the duration sum of the change rate samples in each amplitude interval and the accumulation sum of the absolute values of the change rates; Taking the proportion of the sum of the duration of the change rate samples in each amplitude interval to the total duration of the sealing response characteristic section as a time duty ratio parameter of the corresponding amplitude interval, and taking the proportion of the sum of the absolute value accumulation of the change rate in each amplitude interval to the sum of the absolute value accumulation of all the change rates in the sealing response characteristic section as a change contribution degree parameter of the corresponding amplitude interval; when the time duty ratio parameter and the change contribution degree parameter corresponding to a certain amplitude interval are simultaneously larger than a preset threshold value and the corresponding parameters relative to other amplitude intervals are all maximum values, determining the change rate behavior corresponding to the amplitude interval as a sealing contact leading state of the sealing response characteristic section; And when the single amplitude interval meeting the condition does not exist, marking the sealing contact dominant state corresponding to the sealing response characteristic section as a composite contact state.
7. The intelligent monitoring and state evaluating system for sealing wear of a hemispherical valve according to claim 1, wherein the working process of the dominant determining unit comprises the following steps: In each operation period, counting the accumulated duration of the seal contact leading state identifiers corresponding to the seal response characteristic segments according to time sequence, and determining the seal contact leading state identifier with the longest accumulated duration as the period leading state in the operation period; when the period leading state of the next operation period is inconsistent with the period leading state of the previous operation period and the period leading state of the previous operation period is not the state with the longest accumulated duration in the next operation period, the period leading state of the next operation period is considered to form substitution for the period leading state of the previous operation period; when the same sealing contact dominant state remains as a period dominant state for at least one consecutive operating period and the replaced sealing contact dominant state does not become a period dominant state again, the sealing contact dominant state is determined to be a dominant sealing contact dominant state within the current operating phase.
8. The intelligent monitoring and state evaluating system for sealing abrasion of a hemispherical valve according to claim 1, wherein the migration identifying unit performs cross-period alignment analysis on corresponding dominant sealing response characteristic sections of the same sealing contact dominant state in a plurality of operation periods, and determines the space migration condition of the sealing contact dominant state, and the processing procedure comprises the following steps: In a plurality of continuous operation periods, aiming at the same dominant sealing contact dominant state, extracting corresponding dominant sealing response characteristic sections in each operation period, and constructing parameter behavior distribution description of the dominant sealing response characteristic sections based on parameter change rate time sequences in the dominant sealing response characteristic sections; The parameter behavior distribution description at least comprises a distribution gravity center position of the parameter change rate on a characteristic section time axis and a discrete degree thereof, wherein the distribution gravity center position is used for representing a dominant action interval of the parameter change behavior in the characteristic section; comparing the parameter behavior distribution descriptions corresponding to the same sealing contact dominant state between adjacent operation periods, and judging that the sealing contact dominant state is spatially migrated in the operation period range when systematic migration in the consistent direction is presented in a plurality of continuous operation periods by the distribution center of gravity position and exceeds a preset period migration judgment threshold value; and the period migration judgment threshold value is determined based on the natural fluctuation range of the gravity center of the parameter behavior distribution corresponding to the same sealing contact dominant state in the historical operation period.
9. The intelligent monitoring and state evaluating system for sealing wear of a hemispherical valve according to claim 8, wherein the migration identifying unit distinguishes the migration form of the space migration based on the change characteristics of the center of gravity position of the distribution of the corresponding parameter behaviors of the same sealing contact dominant state in a plurality of operation cycles after determining that the space migration of the sealing contact dominant state occurs, and the process comprises: In a plurality of continuous operation periods, acquiring the center of gravity positions of parameter behavior distribution corresponding to the same sealing contact dominant state, and forming a center of gravity position sequence according to the operation period sequence; When the offset of the gravity center position between adjacent running periods does not exceed a preset single-period migration threshold value and the offset continuously changes towards the same direction within the running period range, judging the corresponding space migration as progressive migration; When the offset of the gravity center position is detected to exceed the single-period migration threshold value between any adjacent operation periods and the offset is kept stably existing in the subsequent operation period, the corresponding space migration is judged to be the step migration; And the single-period migration threshold is determined based on the maximum natural offset range of the gravity center position corresponding to the same sealing contact dominant state in the historical stable operation period.
10. The intelligent monitoring and state evaluation system for the seal wear of the hemispherical valve according to claim 1, wherein the state evaluation module evaluates the seal wear state of the hemispherical valve by the following steps: In a continuous operation period, obtaining the persistence characteristics of the corresponding dominant seal response characteristic sections of the same dominant seal contact dominant state and the corresponding space migration identification results; When the dominant seal response characteristic section is kept unchanged in a continuous operation period and no space migration is detected, determining that the corresponding seal abrasion state is a stable state; when the dominant seal response characteristic section continuously exists in a continuous operation period and progressive space migration of a seal contact dominant state is detected, determining that a corresponding seal abrasion state is a progressive evolution state; when detecting that the seal contact dominant state has step space migration or the dominant seal response characteristic section has substitution change in an adjacent operation period, determining the corresponding seal abrasion state as a mutation evolution state; And outputting the seal abrasion state as a seal abrasion evaluation result of the current operation stage.

Description

Intelligent monitoring and state evaluating system for seal abrasion of hemispherical valve Technical Field The invention relates to the technical field of intelligent monitoring of industrial valves, in particular to an intelligent monitoring and state evaluating system for sealing abrasion of a hemispherical valve. Background The half ball valve is widely applied to high-pressure and high-abrasion working conditions due to small opening and closing moment and good sealing performance. The sealing pair is easy to wear in long-term operation, and the safety and the service life of the valve are affected. The existing intelligent monitoring technology for the sealing abrasion of the hemispherical valve mainly realizes the assessment and early warning of the sealing state by collecting and analyzing the sealing performance and the running state parameters of the valve. The common technical scheme includes that in the valve test or operation process, pressure change, leakage condition and valve action parameters in a sealed cavity are monitored, and the degree of seal abrasion is judged by combining a data analysis model. For example, CN118565720B discloses a device and a method for detecting tightness of a hemispherical valve, which are used for detecting the sealing leakage position by using a detection head and a water absorption structure through injecting water into the hemispherical valve to form a closed space, so as to realize the judgment of the sealing performance of the valve. CN119618504B proposes a seal tester air tightness monitoring system based on artificial intelligence, and a prediction model is constructed to evaluate the sealing state by collecting air pressure change parameters and air bubble image information in a sealing cavity. The existing hemispherical valve seal abrasion monitoring technology is widely used in practical application to judge the sealing state based on analysis of the integral state of the sealing performance or the change of the operation parameters. However, the half ball valve usually has eccentric motion characteristics in the opening and closing process, and the actual contact area of the sealing pair is not fixed and unchanged, but is subjected to space migration along with the opening and closing times, structural deformation and working condition change. In the prior art, seal wear is generally regarded as a process of gradually accumulating along a fixed seal contact area, and a monitoring model is mostly based on leakage amount, pressure change or change trend of action parameters as a judging basis of seal degradation. When migration of the seal-pair contact area occurs, the new contact area may reform an effective seal in a short period of time, resulting in a stepwise improvement or fluctuation in the sealing performance detection result. Because the prior monitoring technology is difficult to distinguish whether the sealing performance change is caused by the abrasion evolution of the same contact area or the migration of the sealing contact area, the monitoring result is easy to be inconsistent with the actual abrasion state. Under the condition, the evolution of the seal abrasion state does not show monotonic change characteristics, and the existing monitoring method based on trend analysis and historical data modeling is difficult to accurately reflect the real abrasion process of the seal pair, so that the judgment of the seal failure risk of the half ball valve is affected. Disclosure of Invention Aiming at the defects of the prior art, the invention discloses an intelligent monitoring and state evaluating system for the sealing abrasion of a hemispherical valve, which aims to stably reflect the evolution characteristics of the sealing abrasion under complex working conditions and long-term running conditions, reduce misjudgment caused by instantaneous fluctuation and provide reliable basis for running evaluation and maintenance decision of the sealing state of the hemispherical valve. In order to achieve the technical effects, the invention adopts the following technical scheme: an intelligent monitoring and state evaluating system for hemispherical valve seal wear, comprising: The monitoring organization module is used for dividing the opening and closing process of the half ball valve into a plurality of operation phases with different structural stress characteristics and generating a monitoring trigger signal based on the operation phases; The system comprises a state analysis module, a migration identification unit and a migration identification unit, wherein the state analysis module is used for analyzing sealing states in different operation stages and comprises a multi-state acquisition unit, a segmentation construction unit, a leading judgment unit and a migration identification unit, the multi-state acquisition unit is used for acquiring relevant sealing operation parameters in the operation stages corresponding to all monitoring trigger s