Valve sealing performance detection system and method

Abstract

The invention relates to a valve sealing performance detection system and method, and belongs to the technical field of valve detection. The problems that traditional valve detection is limited to sealing performance detection in a closed state, and monitoring on abnormal changes of pressure, temperature and flow parameters in detection is insufficient are solved. Comprising a valve installation module, a sealing performance evaluation module, a safety monitoring module and a control and display module. The control and display module determines the acquisition evaluation value and the acquisition frequency of the acquisition parameters according to the valve pressure and the opening range, so that the pertinence and the effectiveness of data acquisition are greatly improved; the sealing performance evaluation module establishes a pressure curve, a flow curve and a temperature curve by analyzing various parameters, and analyzes the pressure curve, the flow curve and the temperature curve to obtain a valve sealing value, so as to accurately judge the sealing performance of the valve; the safety monitoring module can deeply analyze the curve to calculate an alarm evaluation value, compares the alarm evaluation value with a preset threshold value, and gives an alarm for abnormal conditions of pressure, temperature and flow in time, so that the safety of the detection process is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of valve detection, and in particular relates to a valve sealing detection system and method. Background Art

[0002] As a key component in many fields such as industrial production, energy transmission, and water conservancy projects, the sealing performance of valves directly affects the safety and normal operation of the entire system.

[0003] In the production and use of valves, sealing detection is of vital importance; traditional detection methods often only focus on the sealing of valves in the closed state. However, for valves in many practical applications, especially regulating valves, their sealing at different openings is also critical; in addition, during the valve sealing detection process, if there is a lack of effective monitoring mechanism for abnormal conditions that may occur due to changes in parameters such as pressure, temperature and flow, serious safety accidents may occur, such as pipeline rupture, equipment damage, valve damage, etc. For this reason, we propose a valve sealing detection system and method. Summary of the invention

[0004] The object of the present invention is to provide a valve sealing detection system and method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a valve sealing detection system, comprising a valve installation module, a sealing evaluation module, a safety monitoring module and a control and display module; Valve installation module: install the valve to be tested on the valve sealing test pipeline, and install data collection sensors around the inlet and outlet of the valve on the test pipeline. The data collection sensors include: pressure sensor, flow sensor, temperature sensor and displacement sensor; Control and display module: collect the detection pressure range and opening of the valve to be detected; set three pressure detection values ​​from the detection pressure range of the detection valve, set three valve openings according to the valve opening range, combine the three valve openings of the detection valve with the three pressure detection values ​​in pairs, set the collection frequency for each combination of valve opening and detection pressure value to collect the detection parameters, the detection parameters include: pressure, flow rate and temperature at the inlet and outlet of the detection valve; Sealing evaluation module: Analyze the detection parameters under each combination of valve opening and detection pressure value, and establish pressure curve, flow curve and temperature curve respectively. Analyze the pressure curve, flow curve and temperature curve to obtain the sealing evaluation value. The valve tightness value of the valve is obtained by comprehensively analyzing the valve sealing evaluation value under each combination of valve opening and detection pressure value. The valve tightness value of the valve is judged according to the valve tightness value. Safety monitoring module: Analyze the pressure curve, flow curve and temperature curve during the valve sealing test to obtain the pressure wave value, temperature wave value and flow wave value, analyze the pressure wave value, temperature wave value and flow wave value to obtain the pressure alarm evaluation value, temperature alarm evaluation value and flow alarm evaluation value, and judge whether there are abnormal pressure, temperature and flow during the valve detection process according to the pressure alarm evaluation value, temperature alarm evaluation value and flow alarm evaluation value.

[0006] Preferably, the specific process of the control and display module setting the collection frequency for different combinations of valve openings and detection pressure values ​​to collect the detection parameters is as follows: Input the valve parameters of the detection valve in the control and display module, the valve parameters include: detection pressure range, valve opening range; Three pressure detection values ​​are set according to the detection pressure range of the detection valve, namely low pressure detection value, medium pressure detection value and high pressure detection value; low pressure detection value refers to the pressure value corresponding to 25% of the maximum value of the detection pressure range in the detection pressure range; medium pressure detection value refers to the pressure value corresponding to 50% of the maximum value of the detection pressure range in the detection pressure range; high pressure detection value refers to the pressure value corresponding to 75% of the maximum value of the detection pressure range in the detection pressure range; According to the valve opening range, three valve openings are set, namely closed opening, medium opening and high opening. The closed opening refers to the opening when the valve is fully closed, the medium opening refers to the opening when the valve is half open, and the high opening refers to the opening corresponding to 75% of the maximum value of the valve opening range within the entire valve opening range; The three valve openings of the detection valve and the three pressure detection values ​​are combined in pairs. For each combination of valve opening and detection pressure value, the detection pressure value in the combination is recorded as the detection pressure value H. At the same time, the flow area of ​​the valve opening in the combination is calculated and marked as the flow surface value S. The flow area is: the area of ​​the channel through which the fluid passes when flowing from the valve inlet side to the valve outlet side; after the detection pressure value H and the flow surface value S are normalized, the collection evaluation value CP is obtained using the formula: CP=ZC-(H×a1+S×a2); wherein a1 and a2 are preset weight coefficients, ZC is the preset evaluation basic value, and several collection evaluation levels are preset, each collection evaluation level corresponds to a collection evaluation value interval, and each collection evaluation level corresponds to a collection interval; For each combination of valve opening and detection pressure value, the acquisition evaluation value CP is matched with the acquisition evaluation value intervals corresponding to several preset acquisition evaluation levels one by one; the acquisition interval corresponding to the successfully matched acquisition evaluation level is output to obtain the acquisition interval corresponding to various combinations of valve opening and detection pressure value; When the valve sealing is tested under various combinations of valve opening and test pressure values, the test parameters are collected based on the above-mentioned corresponding collection intervals, and the collected test parameters are sent to the sealing evaluation module.

[0007] Preferably, the process of analyzing the detection parameters under the combination of each valve opening and detection pressure value and establishing the pressure curve, flow curve and temperature curve is as follows: For each combination of valve opening and detection pressure value, the real-time pressure difference, flow difference and temperature difference between the valve inlet and outlet at each collection moment during the detection process of the valve in the pressure increasing stage, pressure maintaining stage and pressure reducing stage are calculated in real time; Establish curve graphs of pressure difference, flow difference and temperature difference changing with time respectively, wherein time is the horizontal axis and pressure difference, flow difference and temperature difference are the vertical axis in their respective curve graphs, substitute the pressure difference, flow difference and temperature difference corresponding to each collection moment into their corresponding curve graphs respectively, in the curve graphs of pressure difference, flow difference and temperature difference changing with time, connect the pressure difference, flow difference and temperature difference corresponding to each collection point in the order of collection moment in order to obtain pressure curve, flow curve and temperature curve.

[0008] Preferably, the process of analyzing the pressure curve, the flow curve and the temperature curve to obtain the sealing evaluation value is: The preset pressure curve, flow curve and temperature curve all correspond to preset standard change curves. In the curve diagram of pressure difference changing with time, the pressure curve is marked as Y1, and the standard change curve corresponding to the pressure curve is marked as Y2. The Y1 and Y2 curves are discretized respectively to obtain their corresponding point sets {(x1, y11), (x1, y12), ..., (x1, y1m)} and {(x1, y21), (x1, y22), ..., (x1, y2m)}, where m=1, 2, ..., n; n is the total number of acquisition moments in the curve diagram of pressure difference changing with time; Using the formula: , obtain the pressure deviation value PC of the pressure curve and its corresponding standard change curve; mark the method of calculating the similarity evaluation value between the pressure curve and its corresponding standard change curve as the deviation value calculation method, and use the deviation value calculation method to calculate the flow deviation value PL between the flow curve and its corresponding standard change curve and the temperature deviation value PW between the temperature curve and its corresponding standard change curve; By normalizing the pressure deviation value PC, flow deviation value PL and temperature deviation value PW and substituting them into the formula: MP=PC×b1+PL×b2+PW×b3, the sealing evaluation value MP for each combination of valve opening and detection pressure value is obtained, where b1, b2, and b3 are preset weight coefficients.

[0009] Preferably, the process of analyzing the valve tightness value of the valve and judging whether the sealing performance of the valve is qualified according to the valve tightness value of the valve is: The valve sealing evaluation mean value is obtained by adding up the sealing evaluation values ​​under all combinations of valve opening and detection pressure values ​​and then taking the average value, and recorded as the valve tightness value. A valve tightness judgment value is preset. If the valve tightness value of the valve is greater than or equal to the preset valve tightness judgment value, the valve is judged as a valve with unqualified sealing performance, and a valve sealing unqualified instruction is generated and sent to the control and display module. After receiving the valve sealing unqualified instruction, the control and display module displays the valve sealing unqualified. If the valve tightness value of the valve is less than the preset valve tightness judgment value, the valve is judged as a valve with qualified sealing performance, and a valve sealing qualified instruction is generated and sent to the control and display module. After receiving the valve sealing qualified instruction, the control and display module displays the valve sealing qualified.

[0010] Preferably, the specific process of determining whether an abnormal pressure condition occurs during valve detection is as follows: The sealing test process of the valve under each combination of valve opening and test pressure value is evenly divided into several identical test periods; in each test period, the pressure wave value of the period is calculated; the specific calculation method is: the pressure difference values ​​collected at all collection moments in this test period are combined into a digital sequence, and the standard deviation of the digital sequence is calculated. This standard deviation is the pressure wave value of the test period; A line graph of the pressure wave value changing with time is established with the pressure wave value as the vertical axis and the time as the horizontal axis. The pressure wave values ​​of each detection period are sequentially substituted into the line graph in chronological order, and adjacent points are sequentially connected to form a pressure wave line; the pressure wave line portion between two adjacent detection periods is used as the hypotenuse, and the distance between the two adjacent detection periods in the y-axis direction and the distance between the two adjacent detection periods in the x-axis direction are used as two right-angled sides to form a right-angled triangle, which is defined as a detection triangle; multiple alarm monitoring periods are set, and the duration of each alarm monitoring period is equal to the duration of the two detection periods; for each alarm monitoring period, the pressure wave values ​​of the two detection periods contained therein are marked as T1 and T2, and the two detection times are marked as T1 and T2. The area of ​​the detection triangle formed between the segments is marked as T3; after normalizing T1, T2 and T3, substitute them into the preset formula: BJZ=T1×c1+T2×c2+T3×c3 to obtain the pressure alarm evaluation value BJZ of the alarm monitoring period, where c1, c2, c3 are preset weight coefficients; a pressure alarm evaluation threshold is preset for each alarm monitoring period. When the pressure alarm evaluation value is greater than the corresponding preset pressure alarm evaluation threshold, the alarm monitoring period generates a pressure abnormality alarm signal and sends it to the control and display module; after receiving this signal, the control and display module generates a pressure abnormality alarm prompt and marks the analysis method for pressure curve monitoring as the alarm monitoring analysis method.

[0011] Preferably, the specific process of determining whether temperature and flow abnormalities occur during valve detection is as follows: The temperature curve and flow curve are processed separately by adopting the alarm monitoring and analysis method; that is, for the temperature curve, the temperature wave value is obtained by calculating the standard deviation of the temperature difference series in each detection period, and the temperature wave value line graph and temperature wave line are constructed to calculate the temperature alarm evaluation value of the temperature alarm monitoring period. When the value is greater than the corresponding threshold, an abnormal temperature alarm prompt is generated; for the flow curve, the flow wave value is calculated, and so on. If the flow alarm evaluation value exceeds the threshold during the detection process, an abnormal flow alarm prompt is generated.

[0012] Preferably, a detection method of a valve sealing detection system comprises the following steps: Step 1: Install the valve to be tested on the valve sealing test pipeline, install pressure sensors, flow sensors, temperature sensors and displacement sensors around the valve inlet and outlet on the test pipeline, and initialize and calibrate the sensors; Step 2: Set three pressure detection values ​​according to the detection pressure range of the detection valve, and set three valve openings according to the valve opening range; calculate the collection evaluation value of each combination of valve opening and detection pressure value; match the collection evaluation value of each combination of valve opening and detection pressure value with the collection evaluation value interval corresponding to the preset collection evaluation level, so as to determine the collection interval under different combinations of valve opening and detection pressure value, and when testing the valve sealing under each combination of valve opening and detection pressure value, collect the detection parameters based on the above corresponding collection intervals; Step 3: For each combination of valve opening and detection pressure value, calculate the pressure difference, flow difference, and temperature difference at each collection time in real time during the valve pressure increase, pressure maintenance, and pressure reduction stages, respectively establish curves of pressure difference, flow difference, and temperature difference over time, and in each curve, connect the values ​​corresponding to the collection points in the order of collection to obtain pressure curve, flow curve, and temperature curve; discretize the pressure curve and the corresponding standard change curve, calculate the pressure deviation value, and similarly calculate the flow deviation value and temperature deviation value, and conduct a comprehensive analysis of the pressure deviation value, flow deviation value, and temperature deviation value to obtain the sealing evaluation value under each combination of valve opening and detection pressure value, and record the average value calculated by adding the sealing evaluation values ​​of all valve opening and detection pressure value combinations as the valve tightness value, and compare the valve tightness value with the preset valve tightness judgment value. If it is greater than or equal to the judgment value, the valve tightness is judged to be unqualified, otherwise the valve tightness is judged to be qualified; Step 4: For each sealing test process under each combination of valve opening and test pressure value, divide the test process into multiple identical test time periods; calculate the pressure wave value, temperature wave value and flow wave value in each test time period respectively; and establish a line graph of the pressure wave value, temperature wave value and flow wave value changing with time, set multiple alarm monitoring time periods, the duration of each alarm monitoring time period is equal to the duration of two test time periods, and within the alarm detection time period, the wave line between two adjacent test time periods is used as the hypotenuse, and the distance between them in the x-axis direction of the time axis and the y-axis direction of the numerical axis is used as the right-angle side to form a test triangle; and conduct a comprehensive analysis based on the wave values ​​of the two test time periods to obtain the pressure alarm evaluation value, temperature alarm evaluation value and flow alarm evaluation value; compare the pressure alarm evaluation value, temperature alarm evaluation value and flow alarm evaluation value in the alarm monitoring time period with their respective preset thresholds. If the threshold is exceeded, the corresponding abnormal alarm signal is sent to give an alarm prompt.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) A valve sealing detection system and method divides the intervals according to the valve detection pressure range and the opening variation range through the control and display module, obtains the flow surface value and the pressure detection value of the combination for different combinations of opening and pressure detection values, conducts a comprehensive analysis of the flow surface value and the pressure detection value to determine the collection evaluation value, and sets the collection frequency under the combination according to the collection evaluation value; in this way, the most representative data can be collected for different working conditions; the problem of traditional equal-interval collection that may miss key information or collect too much redundant data is avoided, and high-quality original data is provided for subsequent analysis, thereby effectively improving the accuracy of valve sealing judgment.

[0014] (2) This valve sealing detection system and method can avoid the uncertainty of subjective observation by discretizing the pressure curve, flow curve and temperature curve to obtain the deviation value from the corresponding standard change curve, scientifically evaluate the degree of proximity between the actual and ideal states, and obtain the sealing evaluation value by comprehensively analyzing the pressure deviation value, flow deviation value and temperature deviation value, so as to more accurately determine the sealing performance of the valve. Finally, the sealing evaluation value under each combination of opening range and pressure range is averaged to obtain the valve tightness value, and compared with the preset valve tightness judgment value to determine whether the valve sealing is qualified. The performance of the valve under various working conditions is comprehensively considered, and the misjudgment caused by the deviation of the detection result under a single working condition is avoided, thereby improving the accuracy and reliability of the valve sealing detection.

[0015] (3) A valve sealing detection system and method divides the sealing detection process of the valve under various combinations of valve opening and detection pressure values ​​into multiple identical detection time periods; calculates the pressure wave value, temperature wave value and flow wave value in each time period respectively; and establishes a line graph of the pressure wave value, temperature wave value and flow wave value changing with time, sets multiple alarm monitoring time periods, and the duration of each alarm monitoring time period is equal to the duration of two detection time periods. In the alarm detection time period, the wave line between two adjacent detection time periods is used as the hypotenuse, and the distance between the wave line and the wave line in the direction of the time axis x-axis and the value axis y-axis is used as the right angle side to form a detection triangle; and analyzes the wave values ​​of the two detection time periods to obtain the pressure alarm evaluation value, the temperature alarm evaluation value and the flow alarm evaluation value; compares the pressure alarm evaluation value, the temperature alarm evaluation value and the flow alarm evaluation value in the alarm monitoring time period with their respective preset threshold values. If the threshold values ​​are exceeded, a corresponding abnormal alarm signal is sent to give an alarm prompt. In this way, the abnormal conditions of pressure, temperature and flow in the valve detection process can be effectively monitored to ensure the safety and reliability of the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a system block diagram of the present invention; Figure 2 It is a line graph showing the change of pressure wave value over time in the present invention; DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1

[0019] See also Figure 1 - Figure 2 , the present invention provides a valve sealing detection system and method, including a valve installation module, a sealing evaluation module, a safety monitoring module and a control and display module; The valve installation module is used to accurately install the valve to be tested and the acquisition sensor on the sealing test pipeline. The specific process is as follows: Install the valve to be tested on the valve sealing test pipeline, use special sealing gaskets and connecting bolts, tighten them according to the specified torque, and ensure that the connection between the valve and the pipeline is well sealed; on the test pipeline, install collection sensors around the inlet and outlet of the valve. The collection sensors include: pressure sensor, flow sensor, temperature sensor and displacement sensor; and initialize and calibrate the collection sensors; the real-time pressure, flow and temperature at the inlet and outlet of the valve can be collected through the collection sensors, and the opening range of the valve can also be collected.

[0020] The control and display module is used to collect the detection pressure range of the detection valve, control the opening of the detection valve, and set the collection frequency to collect the detection parameters. The detection parameters include: the pressure, flow rate and temperature at the inlet and outlet of the detection valve; the specific process is: Input the valve parameters of the detection valve in the control and display module, the valve parameters include: detection pressure range, valve opening range; Three pressure detection values ​​are set from the detection pressure range of the detection valve, namely low pressure detection value, medium pressure detection value and high pressure detection value; low pressure detection value refers to the pressure value corresponding to 25% of the maximum value of the detection pressure range in the detection pressure range; for example, if the detection pressure range is from 0.1MPa to 0.5MPa, then its range size is 0.4MPa, and the low pressure detection value is 0.1MPa+0.4MPa×25%=0.2MPa; medium pressure detection value refers to the pressure value corresponding to 50% of the maximum value of the detection pressure range in the detection pressure range; high pressure detection value refers to the pressure value corresponding to 75% of the maximum value of the detection pressure range in the detection pressure range; According to the valve opening range, three valve openings are set, namely closed opening, medium opening and high opening. The closed opening refers to the opening when the valve is fully closed, the medium opening refers to the opening when the valve is half open, and the high opening refers to the opening corresponding to 75% of the maximum value of the valve opening range within the entire valve opening range; The three valve openings and three pressure detection values ​​of the detection valve are combined in pairs. For each combination of valve opening and detection pressure value, the detection pressure value in the combination is recorded as the detection pressure value H, and the flow area of ​​the valve opening in the combination is calculated and marked as the flow surface value S, where the flow area is: the area of ​​the channel through which the fluid passes when flowing from the valve inlet side to the valve outlet side; after normalizing the detection pressure value H and the flow surface value S, the collection evaluation value CP is obtained using the formula: CP=ZC-(H×a1+S×a2); where a1 and a2 are preset weight coefficients, and ZC is the preset evaluation basic value, where the evaluation basic values ​​of valves of different specifications and types are different, and the larger the valve specification, the larger the corresponding basic value; preset several collection evaluation levels, each collection evaluation level corresponds to a collection evaluation value interval, and each collection evaluation level corresponds to a collection interval, where the higher the collection evaluation level, the larger the upper and lower bounds of the corresponding collection evaluation value interval and the longer the corresponding collection interval; For each combination of valve opening and detection pressure value, the acquisition evaluation value CP is matched with the acquisition evaluation value intervals corresponding to the preset acquisition evaluation levels one by one; the acquisition interval corresponding to the successfully matched acquisition evaluation level is output to obtain the acquisition interval corresponding to the combination of various valve opening and detection pressure values; When the valve sealing is tested under various combinations of valve opening and test pressure values, the test parameters are collected based on the above-mentioned corresponding collection intervals, and the collected test parameters are sent to the sealing evaluation module.

[0021] It should be noted that the larger the pressure test value and the flow surface value, the greater the real-time pressure, flow and temperature fluctuations at the inlet and outlet of the test valve, and the shorter the collection interval under the corresponding combination; this method greatly improves the pertinence and effectiveness of the test parameter collection, and provides a high-quality data basis for the subsequent accurate analysis of the valve performance and judgment of whether its sealing meets the requirements, thereby further ensuring the reliability and scientificity of the entire valve detection system.

[0022] The sealing evaluation module receives the detection parameters collected by the control and display module, and obtains the valve sealing evaluation value under each combination of valve opening and detection pressure value by analyzing the detection parameters under each combination of valve opening and detection pressure value. The valve tightness value of the valve is obtained by analyzing the valve sealing evaluation value under each combination of valve opening and detection pressure value. Whether the sealing of the valve is qualified is judged according to the valve tightness value of the valve. The specific process is as follows: For each combination of valve opening and detection pressure value, the real-time pressure difference, flow difference and temperature difference between the valve inlet and outlet at each collection moment during the detection process of the valve in the pressure increasing stage, pressure maintaining stage and pressure reducing stage are calculated in real time; Establish curves of pressure difference, flow difference and temperature difference over time respectively, wherein time is the horizontal axis, and pressure difference, flow difference and temperature difference in their respective curves are the vertical axis, and substitute the pressure difference, flow difference and temperature difference corresponding to each acquisition moment into their corresponding curves respectively, and in the curves of pressure difference, flow difference and temperature difference over time, connect the pressure difference, flow difference and temperature difference corresponding to each acquisition point in the order of acquisition moments, and obtain pressure curves, flow curves and temperature curves, and the preset pressure curves, flow curves and temperature curves all correspond to preset standard change curves; In the curve diagram of pressure difference changing with time, the pressure curve is marked as Y1, and the standard change curve corresponding to the pressure curve is marked as Y2. The Y1 and Y2 curves are discretized respectively to obtain the corresponding point sets {(x1, y11), (x1, y12), ..., (x1, y1m)} and {(x1, y21), (x1, y22), ..., (x1, y2m)}, where m = 1, 2, ..., n; n is the total number of acquisition moments in the curve diagram of pressure difference changing with time; Using the formula: , obtain the pressure deviation value PC of the pressure curve and its corresponding standard change curve; mark the method of calculating the similarity evaluation value between the pressure curve and its corresponding standard change curve as the deviation value calculation method, and use the deviation value calculation method to calculate the flow deviation value PL between the flow curve and its corresponding standard change curve and the temperature deviation value PW between the temperature curve and its corresponding standard change curve; By normalizing the pressure deviation value PC, flow deviation value PL and temperature deviation value PW and substituting them into the formula: MP=PC×b1+PL×b2+PW×b3, the sealing evaluation value MP under each combination of valve opening and detection pressure value is obtained, where b1, b2 and b3 are preset weight coefficients; The valve sealing evaluation mean value is obtained by adding up the sealing evaluation values ​​under all combinations of valve opening and detection pressure values ​​and then taking the average value, and recorded as the valve tightness value. A valve tightness judgment value is preset. If the valve tightness value of the valve is greater than or equal to the preset valve tightness judgment value, the valve is judged as a valve with unqualified sealing performance, and a valve sealing unqualified instruction is generated and sent to the control and display module. After receiving the valve sealing unqualified instruction, the control and display module displays the valve sealing unqualified. If the valve tightness value of the valve is less than the preset valve tightness judgment value, the valve is judged as a valve with qualified sealing performance, and a valve sealing qualified instruction is generated and sent to the control and display module. After receiving the valve sealing qualified instruction, the control and display module displays the valve sealing qualified.

[0023] It should be noted that graphs showing the changes of pressure difference, flow difference and temperature difference over time under each combination of valve opening and detection pressure value are established respectively, and the pressure difference, flow difference and temperature difference calculated under the corresponding combination of valve opening and detection pressure value are substituted into the corresponding graphs to form pressure curves, flow curves and temperature curves, so as to be able to clearly display the change trend of valve sealing performance in a visual manner under each combination of valve opening and detection pressure value, and also to facilitate the staff to timely discover abnormal situations during the valve sealing detection process. By discretizing the pressure curve, flow curve and temperature curve to obtain similarity values ​​with the corresponding standard change curves, subjective observation can be avoided. Uncertainty, scientifically evaluate the degree of proximity between the actual and ideal states, and obtain the sealing evaluation value through comprehensive analysis of pressure similarity values, flow similarity values ​​and temperature similarity values, so as to more accurately measure the sealing performance of the valve. Finally, the sealing evaluation value under each combination of valve opening and test pressure value is averaged to obtain the valve tightness value, and compared with the preset valve tightness judgment value to determine whether the valve sealing is qualified. The performance of the valve under various working conditions is fully considered to avoid misjudgment due to deviation in the test results under a single working condition, improve the accuracy and reliability of valve sealing detection, ensure that only valves that truly meet the sealing requirements can pass the test and be put into use, and ensure the safe and stable operation of related systems.

[0024] The safety monitoring module monitors the abnormal pressure curve, flow curve and temperature curve during the valve sealing test. The specific process is as follows: The sealing test process of the valve under each combination of valve opening and test pressure value is evenly divided into several identical test periods; in each test period, the pressure wave value of the period is calculated; the specific calculation method is: the pressure difference values ​​collected at all collection moments in this test period are combined into a digital sequence, and the standard deviation of the digital sequence is calculated. This standard deviation is the pressure wave value of the test period; A line graph of the pressure wave value changing with time is established with the pressure wave value as the vertical axis and the time as the horizontal axis. The pressure wave values ​​of each detection period are sequentially substituted into the line graph in chronological order, and adjacent points are sequentially connected to form a pressure wave line; the pressure wave line portion between two adjacent detection periods is used as the hypotenuse, and the distance between the two adjacent detection periods in the y-axis direction and the distance between the two adjacent detection periods in the x-axis direction are used as two right-angled sides to form a right-angled triangle, which is defined as a detection triangle; multiple alarm monitoring periods are set, and the duration of each alarm monitoring period is equal to the duration of the two detection periods; for each alarm monitoring period, the pressure wave values ​​of the two detection periods contained therein are marked as T1 and T2, and the two detection times are marked as T1 and T2. The area of ​​the detection triangle formed between the segments is marked as T3; after normalizing T1, T2 and T3, substitute them into the preset formula: BJZ=T1×c1+T2×c2+T3×c3, and obtain the pressure alarm evaluation value BJZ of the alarm monitoring period, where c1, c2, c3 are preset weight coefficients; a pressure alarm evaluation threshold is preset for each alarm monitoring period, and when the pressure alarm evaluation value is greater than the corresponding preset pressure alarm evaluation threshold, the alarm monitoring period generates a pressure abnormality alarm signal and sends it to the control and display module; after receiving this signal, the control and display module generates a pressure abnormality alarm prompt and marks the analysis method for pressure curve monitoring as the alarm monitoring analysis method; The temperature curve and flow curve are processed separately by adopting the alarm monitoring and analysis method; that is, for the temperature curve, the temperature wave value is obtained by calculating the standard deviation of the temperature difference series in each detection period, and the temperature wave value line graph and temperature wave line are constructed to calculate the temperature alarm evaluation value of the temperature alarm monitoring period. When the value is greater than the corresponding threshold, an abnormal temperature alarm prompt is generated; for the flow curve, the flow wave value is calculated, and so on. If the flow alarm evaluation value exceeds the threshold during the detection process, an abnormal flow alarm prompt is generated.

[0025] It should be noted that the safety monitoring module can effectively monitor abnormal conditions of pressure, temperature and flow during valve detection to ensure the safety and reliability of the detection process.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve sealing detection system, comprising a valve installation module, a sealing evaluation module, a safety monitoring module and a control and display module, characterized in that: Valve installation module: install the valve to be tested on the valve sealing test pipeline, and install data collection sensors around the inlet and outlet of the valve on the test pipeline. The data collection sensors include: pressure sensor, flow sensor, temperature sensor and displacement sensor; Control and display module: collect the detection pressure range and opening of the valve to be detected; set three pressure detection values ​​from the detection pressure range of the detection valve, set three valve openings according to the valve opening range, combine the three valve openings of the detection valve with the three pressure detection values ​​in pairs, set the collection frequency for each combination of valve opening and detection pressure value to collect the detection parameters, the detection parameters include: pressure, flow rate and temperature at the inlet and outlet of the detection valve; Sealing evaluation module: Analyze the detection parameters under each combination of valve opening and detection pressure value, and establish pressure curve, flow curve and temperature curve respectively. Analyze the pressure curve, flow curve and temperature curve to obtain the sealing evaluation value. The valve tightness value of the valve is obtained by comprehensively analyzing the valve sealing evaluation value under each combination of valve opening and detection pressure value. The valve tightness value of the valve is judged according to the valve tightness value. Safety monitoring module: Analyze the pressure curve, flow curve and temperature curve during the valve sealing test to obtain the pressure wave value, temperature wave value and flow wave value, analyze the pressure wave value, temperature wave value and flow wave value to obtain the pressure alarm evaluation value, temperature alarm evaluation value and flow alarm evaluation value, and judge whether there are abnormal pressure, temperature and flow during the valve detection process according to the pressure alarm evaluation value, temperature alarm evaluation value and flow alarm evaluation value.

2. A valve sealing detection system according to claim 1, characterized in that: The specific process of the control and display module setting the acquisition frequency for different combinations of valve opening and detection pressure values ​​to collect detection parameters is as follows: Input the valve parameters of the detection valve in the control and display module, the valve parameters include: detection pressure range, valve opening range; Three pressure detection values ​​are set according to the detection pressure range of the detection valve, namely low pressure detection value, medium pressure detection value and high pressure detection value; low pressure detection value refers to the pressure value corresponding to 25% of the maximum value of the detection pressure range in the detection pressure range; medium pressure detection value refers to the pressure value corresponding to 50% of the maximum value of the detection pressure range in the detection pressure range; high pressure detection value refers to the pressure value corresponding to 75% of the maximum value of the detection pressure range in the detection pressure range; According to the valve opening range, three valve openings are set, namely closed opening, medium opening and high opening. The closed opening refers to the opening when the valve is fully closed, the medium opening refers to the opening when the valve is half open, and the high opening refers to the opening corresponding to 75% of the maximum value of the valve opening range within the entire valve opening range; The three valve openings of the detection valve and the three pressure detection values ​​are combined in pairs. For each combination of valve opening and detection pressure value, the detection pressure value in the combination is recorded as the detection pressure value H. At the same time, the flow area of ​​the valve opening in the combination is calculated and marked as the flow surface value S. The flow area is: the area of ​​the channel through which the fluid passes when flowing from the valve inlet side to the valve outlet side; after the detection pressure value H and the flow surface value S are normalized, the collection evaluation value CP is obtained using the formula: CP=ZC-(H×a1+S×a2); wherein a1 and a2 are preset weight coefficients, ZC is the preset evaluation basic value, and several collection evaluation levels are preset, each collection evaluation level corresponds to a collection evaluation value interval, and each collection evaluation level corresponds to a collection interval; For each combination of valve opening and detection pressure value, the acquisition evaluation value CP is matched with the acquisition evaluation value intervals corresponding to several preset acquisition evaluation levels one by one; the acquisition interval corresponding to the successfully matched acquisition evaluation level is output to obtain the acquisition interval corresponding to various combinations of valve opening and detection pressure value; When the valve sealing is tested under various combinations of valve opening and test pressure values, the test parameters are collected based on the above-mentioned corresponding collection intervals, and the collected test parameters are sent to the sealing evaluation module.

3. A valve sealing detection system according to claim 2, characterized in that: The process of analyzing the detection parameters under the combination of each valve opening and detection pressure value and establishing the pressure curve, flow curve and temperature curve is as follows: For each combination of valve opening and detection pressure value, the real-time pressure difference, flow difference and temperature difference between the valve inlet and outlet at each collection moment during the detection process of the valve in the pressure increasing stage, pressure maintaining stage and pressure reducing stage are calculated in real time; Establish curve graphs of pressure difference, flow difference and temperature difference changing with time respectively, wherein time is the horizontal axis and pressure difference, flow difference and temperature difference are the vertical axis in their respective curve graphs, substitute the pressure difference, flow difference and temperature difference corresponding to each collection moment into their corresponding curve graphs respectively, in the curve graphs of pressure difference, flow difference and temperature difference changing with time, connect the pressure difference, flow difference and temperature difference corresponding to each collection point in the order of collection moment in order to obtain pressure curve, flow curve and temperature curve.

4. A valve sealing detection system according to claim 3, characterized in that: The process of analyzing the pressure curve, flow curve and temperature curve to obtain the sealing evaluation value is as follows: The preset pressure curve, flow curve and temperature curve all correspond to preset standard change curves. In the curve diagram of pressure difference changing with time, the pressure curve is marked as Y1, and the standard change curve corresponding to the pressure curve is marked as Y2. The Y1 and Y2 curves are discretized respectively to obtain their corresponding point sets {(x1, y11), (x1, y12), ..., (x1, y1m)} and {(x1, y21), (x1, y22), ..., (x1, y2m)}, where m=1, 2, ..., n; n is the total number of acquisition moments in the curve diagram of pressure difference changing with time; Using the formula: , obtain the pressure deviation value PC of the pressure curve and its corresponding standard change curve; mark the method of calculating the similarity evaluation value between the pressure curve and its corresponding standard change curve as the deviation value calculation method, and use the deviation value calculation method to calculate the flow deviation value PL between the flow curve and its corresponding standard change curve and the temperature deviation value PW between the temperature curve and its corresponding standard change curve; By normalizing the pressure deviation value PC, flow deviation value PL and temperature deviation value PW and substituting them into the formula: MP=PC×b1+PL×b2+PW×b3, the sealing evaluation value MP for each combination of valve opening and detection pressure value is obtained, where b1, b2, and b3 are preset weight coefficients.

5. A valve sealing detection system according to claim 4, characterized in that: The process of analyzing the valve tightness value of the valve and judging whether the valve tightness is qualified according to the valve tightness value of the valve is as follows: The valve sealing evaluation mean value is obtained by adding up the sealing evaluation values ​​under all combinations of valve opening and detection pressure values ​​and then taking the average value, and recorded as the valve tightness value. A valve tightness judgment value is preset. If the valve tightness value of the valve is greater than or equal to the preset valve tightness judgment value, the valve is judged as a valve with unqualified sealing performance, and a valve sealing unqualified instruction is generated and sent to the control and display module. After receiving the valve sealing unqualified instruction, the control and display module displays the valve sealing unqualified. If the valve tightness value of the valve is less than the preset valve tightness judgment value, the valve is judged as a valve with qualified sealing performance, and a valve sealing qualified instruction is generated and sent to the control and display module. After receiving the valve sealing qualified instruction, the control and display module displays the valve sealing qualified.

6. A valve sealing detection system according to claim 5, characterized in that: The specific process of judging whether abnormal pressure occurs during valve detection is as follows: The sealing test process of the valve under each combination of valve opening and test pressure value is evenly divided into several identical test periods; in each test period, the pressure wave value of the period is calculated; the specific calculation method is: the pressure difference values ​​collected at all collection moments in this test period are combined into a digital sequence, and the standard deviation of the digital sequence is calculated. This standard deviation is the pressure wave value of the test period; A line graph showing the change of pressure wave value over time is established with the pressure wave value as the vertical axis and time as the horizontal axis. The pressure wave values ​​of each detection period are sequentially substituted into the line graph in chronological order, and adjacent points are sequentially connected to form a pressure wave line. The pressure wave line between two adjacent detection periods is used as the hypotenuse, and the distance between two adjacent detection periods in the y-axis direction and the distance between two adjacent detection periods in the x-axis direction are used as two right-angled sides to form a right triangle, which is defined as a detection triangle; multiple alarm monitoring periods are set, and the duration of each alarm monitoring period is equal to the duration of the two detection periods; for each alarm monitoring period, the pressure wave values ​​of the two detection periods contained in it are marked as T1 and T2, and the area of ​​the detection triangle formed between the two detection periods is marked as T3; after normalizing T1, T2 and T3, the area of ​​the detection triangle formed between the two detection periods is marked as T3; Enter the preset formula: BJZ=T1×c1+T2×c2+T3×c3, and obtain the pressure alarm evaluation value BJZ of the alarm monitoring period, where c1, c2, and c3 are preset weight coefficients; a pressure alarm evaluation threshold is preset for each alarm monitoring period. When the pressure alarm evaluation value is greater than the corresponding preset pressure alarm evaluation threshold, the alarm monitoring period generates a pressure abnormality alarm signal and sends it to the control and display module; after receiving this signal, the control and display module generates a pressure abnormality alarm prompt and marks the analysis method for pressure curve monitoring as the alarm monitoring analysis method.

7. A valve sealing detection system according to claim 6, characterized in that: The specific process of judging whether temperature and flow abnormalities occur during valve detection is as follows: The temperature curve and flow curve are processed separately by adopting the alarm monitoring and analysis method; that is, for the temperature curve, the temperature wave value is obtained by calculating the standard deviation of the temperature difference series in each detection period, and the temperature wave value line graph and temperature wave line are constructed to calculate the temperature alarm evaluation value of the temperature alarm monitoring period. When the value is greater than the corresponding threshold, an abnormal temperature alarm prompt is generated; for the flow curve, the flow wave value is calculated, and so on. If the flow alarm evaluation value exceeds the threshold during the detection process, an abnormal flow alarm prompt is generated.

8. A detection method for a valve sealing detection system according to claims 1-7, characterized in that: The following steps are involved: Step 1: Install the valve to be tested on the valve sealing test pipeline, install pressure sensors, flow sensors, temperature sensors and displacement sensors around the valve inlet and outlet on the test pipeline, and initialize and calibrate the sensors; Step 2: Set three pressure detection values ​​according to the detection pressure range of the detection valve, and set three valve openings according to the valve opening range; calculate the collection evaluation value of each combination of valve opening and detection pressure value; match the collection evaluation value of each combination of valve opening and detection pressure value with the collection evaluation value interval corresponding to the preset collection evaluation level, so as to determine the collection interval under different combinations of valve opening and detection pressure value, and when testing the valve sealing under each combination of valve opening and detection pressure value, collect the detection parameters based on the above corresponding collection intervals; Step 3: For each combination of valve opening and detection pressure value, calculate the pressure difference, flow difference, and temperature difference at each collection time in real time during the valve pressure increase, pressure maintenance, and pressure reduction stages, respectively establish curves of pressure difference, flow difference, and temperature difference over time, and in each curve, connect the values ​​corresponding to the collection points in the order of collection to obtain pressure curve, flow curve, and temperature curve; discretize the pressure curve and the corresponding standard change curve, calculate the pressure deviation value, and similarly calculate the flow deviation value and temperature deviation value, and conduct a comprehensive analysis of the pressure deviation value, flow deviation value, and temperature deviation value to obtain the sealing evaluation value under each combination of valve opening and detection pressure value, and record the average value calculated by adding the sealing evaluation values ​​of all valve opening and detection pressure value combinations as the valve tightness value, and compare the valve tightness value with the preset valve tightness judgment value. If it is greater than or equal to the judgment value, the valve tightness is judged to be unqualified, otherwise the valve tightness is judged to be qualified; Step 4: For each sealing test process under each combination of valve opening and test pressure value, divide the test process into multiple identical test time periods; calculate the pressure wave value, temperature wave value, and flow wave value in each test time period respectively; A line graph of the pressure wave value, temperature wave value and flow wave value changing with time is established, and multiple alarm monitoring periods are set. The length of each alarm monitoring period is equal to the length of the two detection periods. Within the alarm detection period, the wave line between two adjacent detection periods is used as the hypotenuse, and the distance between them in the x-axis direction of the time axis and the y-axis direction of the numerical axis is used as the right-angled side to form a detection triangle; and a comprehensive analysis is performed based on the wave values ​​of the two detection periods to obtain the pressure alarm evaluation value, temperature alarm evaluation value and flow alarm evaluation value; the pressure alarm evaluation value, temperature alarm evaluation value and flow alarm evaluation value within the alarm monitoring period are compared with their respective preset thresholds. If the threshold is exceeded, the corresponding abnormal alarm signal is sent to issue an alarm prompt.

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