An automatic control system for detecting opening pressure and leakage of breathing valve

Abstract

The present invention relates to the technical field of breathing valves, and discloses an automatic control system for detecting the opening pressure and leakage amount of a breathing valve, comprising a data acquisition unit, a control and analysis unit, and a display and storage unit; the present invention has a high degree of automation, and constructs an automatic control system comprising multiple units, and a computer can control various components to cooperate, so as to realize the automation of the entire process of detecting the opening pressure and leakage amount of the breathing valve, reduce manual errors, and improve efficiency and accuracy; the detection and analysis are accurate, the opening pressure detection adopts a differential algorithm, and the leakage amount detection is combined with flow meter measurement, multiple acquisitions and a sliding average filtering algorithm to make the detection result reliable; the result presentation and storage are convenient, and can be intuitively displayed through a liquid crystal display screen, and can be stored using a memory card or a hard disk, so as to facilitate reference, tracing and management; the system structure is reasonable and highly functional, and various components cooperate with each other to complete the detection process in an orderly manner, so as to ensure the scientificity and integrity of the detection.

Description

Technical Field

[0001] The invention relates to the technical field of breathing valves, and in particular to an automatic control system for detecting opening pressure and leakage amount of a breathing valve. Background Art

[0002] In industrial production and many fields involving gas storage and transportation, breathing valves play a vital role. Breathing valves can automatically adjust the inlet and outlet of gas according to the changes in the pressure in the container, thereby maintaining the stability of the pressure in the container and preventing safety accidents caused by excessively high or low pressure or affecting the normal operation of equipment. For example, in storage tanks in the petrochemical industry, intermediate station tanks in oil and gas pipelines and other facilities, the performance of breathing valves is directly related to the safety and stability of the entire system.

[0003] However, the traditional method of detecting the opening pressure and leakage of breathing valves has many disadvantages. On the one hand, it mostly relies on manual operation. The inspectors need to manually adjust the pressure source and use simple tools to measure relevant data. This method is not only inefficient, but also has large errors in manual readings and operations, making it difficult to ensure the accuracy and reliability of the test results. On the other hand, the traditional detection process lacks systematic automated control and precise data analysis methods. For the detection of a large number of breathing valves, it is difficult to achieve fast, efficient and accurate detection process management. In addition, the recording and storage of test data are also relatively scattered and inconvenient, which is not conducive to subsequent data tracing, analysis, and long-term tracking and evaluation of changes in breathing valve performance.

[0004] With the continuous development and progress of industrial technology, higher requirements are placed on the accuracy, automation and data management capabilities of breathing valve performance testing. Therefore, a new and more advanced breathing valve opening pressure and leakage detection automatic control system is urgently needed to overcome the shortcomings of existing detection methods and meet the growing needs of industrial production and safety assurance. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic control system for detecting the opening pressure and leakage amount of a breathing valve, which solves the technical problems raised in the background technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An automatic control system for detecting opening pressure and leakage of a breathing valve, comprising:

[0008] A data acquisition unit is used to collect pressure data and flow data, and convert them into digital signals for transmission to the control unit;

[0009] The control and analysis unit is used to receive the data transmitted by the data acquisition unit and perform opening pressure detection and analysis and leakage detection and analysis on the data;

[0010] A display and storage unit, used to display the test results and store the test results;

[0011] Among them, the system consists of an air compressor, a pressure regulating filter, a clamping table, a computer, a multi-channel acquisition controller, a pressure sensor, a flow meter, an electrical ratio valve, an electric needle valve, a solenoid valve and a two-position three-way solenoid valve;

[0012] The air compressor is connected to the pipeline through a pressure regulating filter, and the breathing valve is fixed on the clamping table;

[0013] The computer communicates with the multi-channel acquisition controller via USB, and the multi-channel acquisition controller is respectively connected to the solenoid valve, the two-position three-way solenoid valve, the electric ratio valve, the electric needle valve, the pressure sensor and the flow meter;

[0014] The computer controls the switching of the electromagnetic valve and the two-position three-way electromagnetic valve, collects data from the pressure sensor and the flow sensor, and controls the opening of the electric ratio valve and the electric needle valve through a multi-channel acquisition controller.

[0015] As a further solution of the present invention: the data acquisition unit is mainly composed of a multi-channel acquisition controller, a pressure sensor, and a flow meter; the pressure sensor is used to collect pressure data, the flow meter is used to measure flow data, and the multi-channel acquisition controller is responsible for collecting analog signals from these sensors and converting them into digital signals;

[0016] The control and analysis unit is mainly composed of a computer and an electric ratio valve, an electric needle valve, a solenoid valve, and a two-position three-way solenoid valve; the computer, as the control core, analyzes and processes the collected data according to the preset program and algorithm, and then sends control instructions to the electric ratio valve, the electric needle valve, the solenoid valve, the two-position three-way solenoid valve and other actuators;

[0017] The display and storage unit is mainly composed of a computer and corresponding display devices and storage devices; the computer displays the processed data on the display screen in the form of intuitive charts, curves, numerical values, etc., and stores the data in a local hard disk or other storage media.

[0018] As a further solution of the present invention: the steps of starting pressure detection and analysis are as follows:

[0019] StepA1. Install the breathing valve at the designated position of the detection device;

[0020] Step A2, the control unit sends an opening pressure detection and analysis instruction to the pressure regulating filter, so that the pressure regulating filter gradually applies pressure to the breathing valve at a preset initial pressure value P0;

[0021] The pressure change rate is a preset value, which is R1, and the unit is Pa / s, where Pa / s stands for Pascal per second.

[0022] And the formula for the change of pressure value P with time t is as follows:

[0023] P = P0 + R1 × t;

[0024] The unit of t is s, where s stands for seconds;

[0025] Step A3, the data acquisition unit collects the pressure value at the inlet of the breathing valve in real time, and transmits all the collected pressure values ​​to the control and analysis unit;

[0026] Step A4: The control and analysis unit uses a differential algorithm to analyze all the collected pressure values, and determines the opening pressure of the breathing valve based on the analysis results.

[0027] As a further solution of the present invention: the analysis method in Step A4 is as follows:

[0028] StepA4.1. Obtain two pressure values ​​collected at consecutive times according to the time trend and mark them as P i and P i+1 , P i is the pressure value collected at the nth time point, P i+1 For P i The pressure values ​​collected at the time points adjacent to the corresponding collection time points;

[0029] At the same time, obtain P i The pressure values ​​of the first m acquisition time points are marked as P i-j ;

[0030] Wherein, j = 1, 2, ..., m;

[0031] StepA4.2, through PC = P i+1 -P i , calculate P i and P i+1 The pressure difference PC between them;

[0032] At the same time through Calculate P i and P i The pressure value P at the first m acquisition time points i-j The corresponding average value PP;

[0033] In the formula, when j = 0, P i-j That is P i ;

[0034] StepA4.3, P i+1is compared with PP, and the pressure difference PC is compared with a preset pressure difference threshold PCy:

[0035] If P i+1 >PP and PC>PCy, then determine the pressure value P corresponding to PC at this time i+1 This is the opening pressure of the breathing valve.

[0036] If P i+1 >PP and PC>PCy, at least one of the comparison formulas is not true, then the pressure value P corresponding to PC is determined at this time. i+1 It is not the opening pressure of the breathing valve, and then the two pressure values ​​collected at other adjacent times are further analyzed according to Step A4.1 to Step A4.3.

[0037] As a further solution of the present invention: the leakage detection and analysis steps are as follows:

[0038] Step B1. After completing the opening pressure test, extract the opening pressure of the breathing valve and record it as P open ;

[0039] Step B2, open the pressure P open Combined with the preset pressure increment P Z , calculate the control pressure, and then adjust the pressure of the pressure regulating filter to the control pressure through the control analysis unit;

[0040] The calculation formula of control pressure is: P test =P open +P Z , where P test To control stress;

[0041] Step B3, the flow meter measures the leakage flow of the breathing valve within the specified measurement time T;

[0042] Step B4: During the observation period, the data acquisition unit measures the gas flow of the breathing valve according to the predetermined acquisition time interval and marks it as Q k , k = 1, 2, ... p, and p is the number of times the gas flow is collected during the observation period;

[0043] And p = T / t0, where t0 is a predetermined collection time interval value; where the unit of t0 and T is s, s represents seconds;

[0044] Step B5, the control and analysis unit performs filtering processing on the collected gas flow value, and determines the leakage amount of the breathing valve according to the filtering processing;

[0045] Step B6, control the analysis unit by:

[0046]

[0047] Calculate the leakage L of the breathing valve during the observation period;

[0048] Then the leakage volume L calculated during the observation period is compared with the preset standard leakage allowable value L of the breathing valve. std Compare and determine whether the leakage of the breathing valve is acceptable.

[0049] As a further solution of the present invention: in Step B5, the filtering process adopts a sliding average filtering algorithm;

[0050] The formula is as follows:

[0051]

[0052] Where, Q1 k is the value of the gas flow collected for the kth time after filtering, that is, the leakage collected for the kth time, Q k is the value of the gas flow collected for the kth time in StepB4, and v is the preset sliding average window length.

[0053] As a further solution of the present invention: In Step B6, the method of judging whether the leakage amount of the breathing valve is qualified is as follows:

[0054] If L>L std , it means that the leakage of the breathing valve is unqualified;

[0055] If L≤L std , it means that the leakage of the breathing valve is within the acceptable range.

[0056] As a further solution of the present invention: wherein the detection results include the opening pressure and leakage amount of the breathing valve; the display unit uses a liquid crystal display screen to display data; the storage unit uses a memory card or a hard disk for storage.

[0057] Beneficial effects of the present invention:

[0058] High degree of automation: By building an automatic control system including data acquisition unit, control analysis unit, display and storage unit, etc., each unit works together, and the computer can control the switching of multiple components, collect data, and control the opening of related valves, etc. The entire breathing valve opening pressure and leakage detection process is automated, reducing the errors and cumbersome processes caused by manual operation, and improving detection efficiency and accuracy.

[0059] In terms of opening pressure detection: a differential algorithm is used to analyze the collected pressure values. By comparing the pressure values ​​collected at adjacent times, the average pressure values ​​of the previous several collection time points, and the preset pressure difference threshold and other factors in detail, the opening pressure of the breathing valve can be accurately determined, making the detection results of the opening pressure more reliable.

[0060] In terms of leakage detection: not only is the flow meter used to measure the leakage flow of the breathing valve within a specified time, but the gas flow is also measured multiple times according to the predetermined collection time interval, and the sliding average filtering algorithm is used to filter the collected gas flow values, effectively removing interference factors in the data, and then more accurately determining the leakage of the breathing valve. At the same time, it is compared with the preset standard leakage allowable value to determine whether it is qualified, making the leakage detection result more accurate.

[0061] Convenient result presentation and storage: Equipped with a display and storage unit, the test results can be intuitively displayed on the LCD screen, which is convenient for operators to view directly; and the test results are stored in storage methods such as memory cards or hard disks, which is convenient for subsequent review, analysis and use as archival materials at any time, which is conducive to data traceability and management.

[0062] The system has a reasonable structure and strong functionality: it is rationally composed of multiple components such as air compressor, pressure regulating filter, clamping table, computer, multi-channel acquisition controller, pressure sensor, flow meter, etc. The components cooperate with each other, so that the system can orderly complete a series of complete detection processes from applying pressure to collecting and analyzing data, thereby fully realizing the effective detection of the opening pressure and leakage of the breathing valve, and ensuring the scientificity and integrity of the relevant performance detection of the breathing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The present invention will be further described below in conjunction with the accompanying drawings.

[0064] Figure 1 The present invention is a system block diagram of an automatic control system for detecting opening pressure and leakage amount of a breathing valve. DETAILED DESCRIPTION

[0065] 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.

[0066] Embodiment 1

[0067] See also Figure 1As shown, the present invention is an automatic control system for detecting opening pressure and leakage of a breathing valve, including an air compressor, a pressure regulating filter, a clamping table, a computer, a multi-channel acquisition controller, a pressure sensor, a flow meter, an electrical ratio valve, an electric needle valve, a solenoid valve and a two-position three-way solenoid valve;

[0068] Among them, the air compressor provides a 0.7MPa air source, which is adjusted to 0.6MPa by the pressure regulating filter and then connected to the pipeline, and the breathing valve is fixed on the clamping table;

[0069] The computer is connected to the multi-channel acquisition controller through USB communication. The multi-channel acquisition controller is respectively connected to the solenoid valve, the two-position three-way solenoid valve, the electric ratio valve, the electric needle valve, the pressure sensor and the flow meter to realize the control and data acquisition of each component.

[0070] The computer controls the solid-state relay to output 24V voltage through I / O to control the switch of the solenoid valve, collects data from the pressure sensor and flow meter, and outputs analog voltage through the digital-to-analog converter to control the opening of the electric ratio valve and the electric needle valve;

[0071] When doing a positive pressure experiment, the system pipeline is switched to a positive pressure channel. The system outputs an analog voltage through a multi-channel acquisition controller to control the opening of the electrical ratio valve, thereby realizing a slow increase in the pressure in the pipeline. The opening of the electric needle valve is then controlled by outputting analog quantity control through a multi-channel acquisition controller to slowly increase the gas flow rate, thereby effectively controlling the gas pressure and flow rate in the pipeline. At this time, the multi-channel acquisition controller collects the pressure sensor data in the pipeline in real time and displays it in the computer software in the form of a curve. The entire software collects the pressure and flow data feedback in the pipeline. The flow data is the data collected by the flowmeter. At the same time, the opening of the electrical ratio valve and the electric needle valve is controlled to realize a steady increase in pipeline pressure and flow rate, until the breathing valve is opened and the pipeline pressure drops suddenly. The pressure curve shows an inflection point, which is the positive pressure opening pressure point of the valve.

[0072] Then, the pressure holding test is carried out. After the opening pressure is reached, the pressure in the pipeline is maintained at the percentage of the previously set opening pressure value, such as 90%, 80%, and 75%. The pressure holding time is started, usually for 60 seconds. This value can be adjusted and reset by the system. The average flow rate collected during the pressure holding time is the positive pressure leakage value of the valve.

[0073] When doing negative pressure experiments, the system pipeline is switched to the negative pressure channel, and a vacuum is drawn through the negative pressure generator. The negative pressure generator controls the magnitude of the negative pressure it generates by adjusting the input gas source through an electrical ratio valve, that is, the system outputs an analog voltage through a multi-channel acquisition controller to control the opening of the electrical ratio valve to control the input drive gas source, thereby controlling the magnitude of the negative pressure generated by the negative pressure generator, achieving a decrease in pipeline pressure and a steady increase in flow, until the breathing valve is opened and the pipeline pressure suddenly changes, and an inflection point appears on the pressure curve, which is the negative pressure opening pressure point of the valve;

[0074] Then, a pressure holding test is carried out. After the opening pressure is reached, the pressure in the pipeline is maintained at a percentage of the previously set opening pressure value, such as 90%, 80%, or 75%. The electrical ratio valve and the electric needle valve are controlled to hold the pressure at that percentage. The timing of the pressure holding test is started, usually for 60 seconds. This value can be adjusted and reset by the system. The average flow rate collected during the pressure holding time is the negative pressure leakage value of the valve.

[0075] After completing the positive and negative pressure opening experiments and leakage tests, click the Save button; then the valve is automatically judged whether it is qualified based on the pre-selected standards and test results, and the test results are saved in the database, and the entire test process is completed.

[0076] This embodiment constructs a complete breathing valve opening pressure and leakage detection automatic control system. Through the coordinated work of a series of components such as an air compressor and a pressure regulating filter, it can achieve effective control of the pressure and flow in the pipeline in positive pressure and negative pressure experiments, accurately measure the positive pressure opening pressure point, positive pressure leakage value, negative pressure opening pressure point and negative pressure leakage value of the breathing valve, and can automatically determine whether the valve is qualified based on pre-selected standards, and save the test results to the database, which improves the degree of automation and accuracy of detection, reduces manual operation errors, and the test process can be recorded and traced.

[0077] Embodiment 2

[0078] As the second embodiment of the present invention, when the present application is implemented, compared with the first embodiment, the technical solution of the present embodiment is different from the first embodiment only in that in the present embodiment, the system is further divided into:

[0079] A data acquisition unit is used to collect pressure data and convert it into digital signals for transmission to the control unit;

[0080] The data acquisition unit includes a pressure sensor, which converts the pressure signal into an electrical signal, which is then processed by a signal conditioning circuit and transmitted to a data multi-channel acquisition controller;

[0081] The control and analysis unit is used to receive the data transmitted by the data acquisition unit and perform opening pressure detection and analysis on it;

[0082] The steps to start pressure detection analysis are as follows:

[0083] StepA1. Install the breathing valve at the designated position of the detection device;

[0084] Step A2, the control unit sends an opening pressure detection and analysis instruction to the pressure regulating filter, so that the pressure regulating filter gradually applies pressure to the breathing valve at a preset initial pressure value P0;

[0085] Among them, the rate of change of pressure is a preset value, which is R1 and the unit is Pa / s;

[0086] And the formula for the change of pressure value P with time t is as follows:

[0087] P = P0 + R1 × t;

[0088] The unit of t is s;

[0089] Step A3, the data acquisition unit collects the pressure value at the inlet of the breathing valve in real time, and transmits all the collected pressure values ​​to the control and analysis unit;

[0090] Step A4, the control analysis unit uses a differential algorithm to analyze all the collected pressure values, and determines the opening pressure of the breathing valve according to the analysis results;

[0091] The analysis method is as follows:

[0092] StepA4.1. Obtain two pressure values ​​collected at consecutive times according to the time trend and mark them as P i and P i+1 , P i is the pressure value collected at the nth time point, P i+1 For P i The pressure values ​​collected at the time points adjacent to the corresponding collection time points;

[0093] At the same time, obtain P i The pressure values ​​of the first m acquisition time points are marked as P i-j ;

[0094] Wherein, j = 1, 2, ..., m;

[0095] StepA4.2, through PC = P i+1 -P i , calculate P i and P i+1 The pressure difference PC between them;

[0096] At the same time through Calculate P i and P iThe pressure value P at the first m acquisition time points i-j The corresponding average value PP;

[0097] In the formula, when j = 0, P i-j That is P i ;

[0098] StepA4.3, P i+1 is compared with PP, and the pressure difference PC is compared with a preset pressure difference threshold PCy:

[0099] If P i+1 >PP and PC>PCy, at this time the pressure value corresponding to PC is P i+1 It is the opening pressure of the breathing valve;

[0100] If P i+1 >PP and PC>PCy, at least one of the comparison formulas is not true, then the pressure value P corresponding to PC is determined at this time. i+1 It is not the opening pressure of the breathing valve, and then the two pressure values ​​collected at other adjacent times are further analyzed according to Step A4.1 to Step A4.3.

[0101] Among them, the control and analysis unit adopts a high-performance microprocessor with powerful data processing capabilities and fast response speed;

[0102] The display and storage unit is used to display the opening pressure test result and store the opening pressure test result for subsequent query and analysis;

[0103] The detection result includes the opening pressure of the breathing valve; the display unit uses a liquid crystal display screen to display data; the storage unit uses a large-capacity memory card or hard disk.

[0104] In this example:

[0105] Data acquisition unit: mainly composed of multi-channel acquisition controller, pressure sensor and flow meter. The pressure sensor is used to collect pressure data, the flow meter is used to measure flow data, and the multi-channel acquisition controller is responsible for collecting the analog signals from these sensors and converting them into digital signals for subsequent processing.

[0106] Control and analysis unit: mainly composed of computer and electric ratio valve, electric needle valve, solenoid valve, two-position three-way solenoid valve. As the control core, the computer analyzes and processes the collected data according to the preset program and algorithm, and then sends control instructions to the electric ratio valve, electric needle valve, solenoid valve, two-position three-way solenoid valve and other actuators to achieve precise control of the system.

[0107] Display and storage unit: mainly composed of a computer and corresponding display devices and storage devices. The computer displays the processed data on the display screen in the form of intuitive charts, curves, values, etc., and stores the data in a local hard disk or other storage media for subsequent query, analysis and printing.

[0108] In this embodiment, the data acquisition unit can convert the pressure signal collected by the pressure sensor into a digital signal and transmit it to the control unit. The control and analysis unit uses a differential algorithm to analyze the collected pressure value to determine the opening pressure of the breathing valve. The algorithm can determine the opening pressure more accurately by comparing adjacent pressure values ​​and the average value of the pressure values ​​at the previous multiple collection time points and a preset pressure difference threshold. At the same time, a high-performance microprocessor is used to improve data processing capabilities and response speed. The display and storage unit facilitates the display and storage of the opening pressure detection results, which is convenient for subsequent query and analysis, thereby improving the accuracy and efficiency of the breathing valve opening pressure detection as a whole.

[0109] Embodiment 3

[0110] As the third embodiment of the present invention, when the present application is specifically implemented, compared with the first and second embodiments, the technical solution of this embodiment is to combine the solutions of the first and second embodiments, and the difference between the technical solution of this embodiment and the first and second embodiments is that in this embodiment, the data acquisition unit is also used to collect flow data and convert it into a digital signal to transmit to the control unit;

[0111] The data acquisition unit also includes a flow meter, which converts the flow signal into an electrical signal, and transmits it to the data multi-channel acquisition controller after being processed by a signal conditioning circuit;

[0112] The control and analysis unit is also used to receive data from the data acquisition unit and perform leakage detection and analysis based on the opening pressure detection and analysis results;

[0113] The steps for leakage detection and analysis are as follows:

[0114] Step B1. After completing the opening pressure test, extract the opening pressure of the breathing valve and record it as P open ;

[0115] Step B2, open the pressure P open Combined with the preset pressure increment P Z , calculate the control pressure, and then adjust the pressure of the pressure regulating filter to the control pressure through the control analysis unit;

[0116] The calculation formula of control pressure is: P test =P open +P Z , where P testTo control stress;

[0117] Step B3, the flow meter measures the leakage flow of the breathing valve within the specified measurement time T;

[0118] Step B4: During the observation period, the data acquisition unit measures the gas flow of the breathing valve according to the predetermined acquisition time interval and marks it as Q k , k = 1, 2, ... p, and p is the number of times the gas flow is collected during the observation period;

[0119] And p=T / t0, where t0 is the predetermined collection time interval value;

[0120] Step B5, the control and analysis unit performs filtering processing on the collected gas flow value, and determines the leakage amount of the breathing valve according to the filtering processing;

[0121] Among them, the filtering process adopts the sliding average filtering algorithm;

[0122] The formula is as follows:

[0123]

[0124] Where, Q1 k is the value of the gas flow collected for the kth time after filtering, that is, the leakage collected for the kth time, Q k is the value of the gas flow collected for the kth time in StepB4, and v is the preset sliding average window length;

[0125] In this embodiment, in the context of breathing valve leakage detection, when the pressure is in a stable state, the gas flow rate is approximately equal to the leakage amount;

[0126] The breathing valve is a device used to maintain the pressure balance in equipment such as storage tanks. Ideally, when the pressure in the equipment is within the normal range, the breathing valve should be closed and no gas will flow. However, in reality, due to factors such as sealing performance, there will be a small amount of gas leakage. When the pressure in the test pipeline connected to the breathing valve is stabilized at the set value through the pressure regulating module, the gas flow through the breathing valve measured by the flow measurement module can be approximately considered as the leakage of the breathing valve. This is because in this stable pressure environment, the flow of gas is mainly caused by leakage caused by the loose sealing of the breathing valve; for example, in a sealed oil tank, the internal pressure of the oil tank is stabilized at a certain value through the adjustment system. At this time, the gas flow through the breathing valve can basically be determined as the gas flow leaking from the breathing valve.

[0127] It should be noted that if the breathing valve itself has a fault, such as an internal channel blockage or other external interference factors such as strong airflow interfering with the flow meter measurement, the measured flow rate may not be completely the actual leakage amount; in this embodiment, the gas flow rate in a stable state can be used as an effective approximate value of the leakage amount to evaluate the leakage of the breathing valve when external interference factors are excluded;

[0128] The display and storage unit is also used to display the leakage detection results and store the leakage detection results for subsequent query and analysis;

[0129] Among them, the test results also include breathing valve and leakage amount.

[0130] In this embodiment, the data acquisition unit can not only collect pressure data but also collect flow data and convert it into digital signals for transmission to the control unit. After completing the opening pressure detection, the control analysis unit can perform leakage detection and analysis based on the results. The control pressure is calculated by combining the preset pressure increment, the leakage flow is measured by the flow meter, and the collected gas flow value is filtered using the sliding average filter algorithm to determine the leakage. When external interference factors are eliminated, the leakage of the breathing valve can be effectively and approximately evaluated. At the same time, the display and storage unit can display and store the leakage detection results, further improving the breathing valve detection function and realizing the integration and precision of opening pressure and leakage detection.

[0131] Embodiment 4

[0132] As the fourth embodiment of the present invention, when the present application is specifically implemented, compared with the first embodiment, the second embodiment and the third embodiment, the difference between the present embodiment and the first embodiment, the second embodiment and the third embodiment is that in the present embodiment, the control analysis unit further:

[0133]

[0134] Calculate the leakage L of the breathing valve during the observation period;

[0135] Then the leakage volume L calculated during the observation period is compared with the preset standard leakage allowable value L of the breathing valve. std Compare and judge whether the leakage of the breathing valve is qualified;

[0136] The specific comparison method is as follows:

[0137] If L>L std , it means that the leakage of the breathing valve is unqualified;

[0138] If L≤L std , it means that the leakage of the breathing valve is within the acceptable range.

[0139] In this embodiment, the control and analysis unit can directly determine whether the leakage of the breathing valve is qualified by calculating the leakage of the breathing valve during the observation period and comparing it with the preset standard leakage allowable value, making the test result more intuitive and facilitating a rapid assessment of the quality status of the breathing valve. Unqualified products can be discovered and handled in a timely manner, helping to ensure the safe operation and stable performance of related equipment.

[0140] Embodiment 5

[0141] As the fifth embodiment of the present invention, when the present application is specifically implemented, compared with the first, second, third and fourth embodiments, the technical solution of this embodiment is to combine and implement the solutions of the above-mentioned first, second, third and fourth embodiments.

[0142] This embodiment combines the solutions of embodiments one, two, three, and four for implementation, integrating the advantages of each embodiment to form a complete detection system with comprehensive functions, high detection accuracy, strong degree of automation, and the ability to effectively determine whether various performance indicators of the breathing valve are qualified. The system can be widely used in the field of quality inspection and performance evaluation of breathing valves, and provide strong guarantees for safe production and equipment maintenance in related industries.

[0143] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters and thresholds in the formula are set by technicians in this field according to actual conditions.

[0144] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An automatic control system for detecting opening pressure and leakage of a breathing valve, characterized in that: include: Data acquisition unit, control and analysis unit, display and storage unit; The data acquisition unit is used to collect pressure data and flow data; The control and analysis unit is used to receive the pressure data and flow data transmitted by the data acquisition unit, and perform opening pressure detection analysis and leakage detection analysis on the data, and determine the opening pressure and leakage of the breathing valve according to the analysis results; The display and storage unit is used to display the detection results and store the detection results.

2. According to claim 1, a breathing valve opening pressure and leakage detection automatic control system is characterized in that: The steps to start pressure detection analysis are as follows: StepA1. Install the breathing valve at the designated position of the detection device; Step A2, the control unit sends an opening pressure detection and analysis instruction to the pressure regulating filter, so that the pressure regulating filter gradually applies pressure to the breathing valve at a preset initial pressure value P0; Among them, the rate of change of pressure is a preset value, and its value is R1; And the formula for the change of pressure value P with time t is as follows: P = P0 + R1 × t; Step A3, the data acquisition unit collects the pressure value at the inlet of the breathing valve in real time, and transmits all the collected pressure values ​​to the control and analysis unit; Step A4: The control and analysis unit uses a differential algorithm to analyze all the collected pressure values, and determines the opening pressure of the breathing valve based on the analysis results.

3. The automatic control system for detecting opening pressure and leakage of a breathing valve according to claim 2 is characterized in that: The analysis method in StepA4 is as follows: StepA4.

1. Obtain two pressure values ​​collected at consecutive times according to the time trend and mark them as P i and P i+1 , P i is the pressure value collected at the nth time point, P i+1 For P i The pressure values ​​collected at the time points adjacent to the corresponding collection time points; At the same time, obtain P i The pressure values ​​of the first m acquisition time points are marked as P i-j ; Wherein, j = 1, 2, ..., m; StepA4.2, through PC = P i+1 -P i , calculate P i and P i+1 The pressure difference PC between them; At the same time through Calculate P i and P i The pressure value P at the first m acquisition time points i-j The corresponding average value PP; In the formula, when j = 0, P i-j That is P i ; StepA4.3, P i+1 The pressure difference PC is compared with PP, and the pressure difference PC is compared with a preset pressure difference threshold PCy, and the opening pressure of the breathing valve is determined based on the comparison result.

4. The automatic control system for detecting opening pressure and leakage of a breathing valve according to claim 3 is characterized in that: In StepA4.3, the comparison is as follows: If P i+1 >PP and PC>PCy, at this time the pressure value corresponding to PC is P i+1 This is the opening pressure of the breathing valve.

5. The automatic control system for detecting opening pressure and leakage of a breathing valve according to claim 1 is characterized in that: The steps for leakage detection and analysis are as follows: Step B1. After completing the opening pressure test, extract the opening pressure of the breathing valve and record it as P open ; Step B2, open the pressure P open Combined with the preset pressure increment P Z , calculate the control pressure, and then adjust the pressure of the pressure regulating filter to the control pressure through the control analysis unit; The calculation formula of control pressure is: P test =P open +P Z , where P test To control stress; Step B3, the flow meter measures the leakage flow of the breathing valve within the specified measurement time T; Step B4: During the observation period, the data acquisition unit measures the gas flow of the breathing valve according to the predetermined acquisition time interval and marks it as Q k , k = 1, 2, ... p, and p is the number of times the gas flow is collected during the observation period; And p=T / t0, where t0 is the predetermined collection time interval value; Step B5, the control and analysis unit performs filtering processing on the collected gas flow value, and determines the leakage amount of the breathing valve based on the filtering processing.

6. The automatic control system for detecting opening pressure and leakage of a breathing valve according to claim 5 is characterized in that: In Step B5, the filtering process uses a sliding average filtering algorithm; The formula is as follows: Where Q1 k is the value of the gas flow collected for the kth time after filtering, that is, the leakage collected for the kth time, Q k is the value of the gas flow collected for the kth time in StepB4, and v is the preset sliding average window length.

7. The automatic control system for detecting opening pressure and leakage of a breathing valve according to claim 6 is characterized in that: The control and analysis unit also: Calculate the leakage L of the breathing valve during the observation period; Then the leakage volume L calculated during the observation period is compared with the preset standard leakage allowable value L of the breathing valve. std Compare and determine whether the leakage of the breathing valve is acceptable.

8. The automatic control system for detecting opening pressure and leakage of a breathing valve according to claim 7, characterized in that: The method to judge whether the leakage of the breathing valve is qualified is as follows: If L>L std , it means that the leakage of the breathing valve is unqualified; If L≤L std , it means that the leakage of the breathing valve is within the acceptable range.

9. The automatic control system for detecting opening pressure and leakage of a breathing valve according to claim 1, characterized in that: in, The system consists of an air compressor, a pressure regulating filter, a clamping table, a computer, a multi-channel acquisition controller, a pressure sensor, a flow meter, an electrical ratio valve, an electric needle valve, a solenoid valve and a two-position three-way solenoid valve; The air compressor is connected to the pipeline through a pressure regulating filter, and the breathing valve is fixed on the clamping table; The computer communicates with the multi-channel acquisition controller via USB, and the multi-channel acquisition controller is respectively connected to the solenoid valve, the two-position three-way solenoid valve, the electric ratio valve, the electric needle valve, the pressure sensor and the flow meter; The computer controls the switching of the electromagnetic valve and the two-position three-way electromagnetic valve, collects data from the pressure sensor and the flow sensor, and controls the opening of the electric ratio valve and the electric needle valve through a multi-channel acquisition controller.

10. The automatic control system for detecting opening pressure and leakage of a breathing valve according to claim 1, characterized in that: in, The test results include the opening pressure and leakage amount of the breathing valve; the display unit uses a liquid crystal display screen to display data; the storage unit uses a memory card or a hard disk for storage.

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