A method and device for online calibration of a breathing valve and a storage medium

Abstract

The application discloses a kind of breathing valve online verification method, device and storage medium, and verification method includes: obtaining the first information of to-be-tested breathing valve, first information includes: ambient temperature, valve initial temperature, valve real-time temperature, target temperature, reference temperature, standard exhalation opening pressure and standard inhalation opening pressure;According to ambient temperature, valve initial temperature and target temperature, valve real-time temperature is adjusted to target temperature;Pressure verification test is carried out to to-be-tested breathing valve, and second information is obtained, second information includes measured exhalation opening pressure and measured inhalation opening pressure;According to first information and second information, qualified determination is carried out, and verification result is output.The application discloses breathing valve online verification method, device and storage medium, by obtaining valve temperature information, actively adjusting valve temperature to target temperature, executing pressure verification and carrying out qualified determination, fundamentally avoid the interference of ambient temperature to breathing valve, improve the accuracy and reliability of online inspection.

Description

Technical Field

[0001] This invention relates to the field of valve testing equipment, and more particularly to an online calibration method, apparatus, and storage medium for breather valves. Background Technology

[0002] The breather valve is a critical safety device installed on the top of the storage tank for automatically regulating the internal pressure. When the internal pressure is too high, the breather valve's exhalation valve opens to release pressure; when the pressure is too low, the inhalation valve opens to replenish air, thus preventing the storage tank from collapsing due to overpressure or negative pressure. The breather valve's set pressure and reseating pressure are its core performance indicators and require regular calibration to ensure the safe operation of the storage tank.

[0003] Existing online calibration methods for breathing valves typically connect the airway interface of the calibration device to the breathing valve, then slowly pressurize or depressurize the valve using a positive or negative pressure source while simultaneously acquiring pressure sensor signals. When a pressure inflection point is reached, the valve is considered open, and this pressure value is recorded as the set pressure. However, this method suffers from a long-overlooked technical problem: the opening pressure of the breathing valve is significantly affected by temperature. Specifically, the elastic modulus of the spring material inside the breathing valve changes with temperature; as temperature increases, the elastic modulus decreases, resulting in a lower opening pressure, and vice versa. Furthermore, the varying hardness and shrinkage rate of the seals at different temperatures also affect the valve's opening and reseating behavior.

[0004] However, existing online calibration methods do not consider the impact of temperature on the calibration results. Calibrators typically measure an opening pressure value directly at the current ambient temperature and then compare it with the set pressure indicated on the breather valve's nameplate. Because no adjustment or compensation is made for the ambient and valve body temperatures, the calibration results cannot distinguish whether the pressure deviation originates from a valve malfunction or is solely caused by ambient temperature, severely affecting the accuracy and consistency of the calibration.

[0005] Furthermore, while some existing technologies have proposed structural improvements to online verification devices, such as adding semiconductor cooling chips to heat or cool the gas, they have not integrated these improvements with a complete verification method. They lack a closed-loop logic from temperature acquisition, temperature regulation, pressure verification to temperature compensation determination, and have not solved the problem of how to select different control modes based on different temperature differences to achieve a balance between energy saving and rapid response.

[0006] Therefore, there is an urgent need for an online calibration method for breathing valves that can actively adjust the valve body temperature to eliminate the interference of ambient temperature on the calibration results and improve the accuracy and reliability of the calibration. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies by providing an online calibration method, apparatus, and storage medium for breather valves. It aims to solve the technical problem that existing online calibration methods for breather valves ignore the influence of temperature, leading to inaccurate calibration results. By acquiring valve body temperature information, actively adjusting the valve body temperature to the target temperature, performing pressure calibration, and determining pass / fail, the invention fundamentally avoids the interference of ambient temperature on the breather valve, improving the accuracy and reliability of online testing under different ambient temperatures.

[0008] Therefore, the primary objective of this invention is to provide an online calibration method for a breathing valve.

[0009] The second objective of this invention is to provide an online calibration device for a breathing valve.

[0010] A third objective of this invention is to provide a computer-readable storage medium.

[0011] To achieve the first objective of this invention, the technical solution of this invention provides an online calibration method for a breathing valve. The calibration method includes: S11, acquiring first information of the breathing valve to be tested, the first information including: ambient temperature, initial valve body temperature, real-time valve body temperature, target temperature, reference temperature, standard expiratory opening pressure, and standard inspiratory opening pressure; S12, adjusting the real-time valve body temperature to the target temperature based on the ambient temperature, initial valve body temperature, and target temperature; S13, performing a pressure calibration test on the breathing valve to be tested to obtain second information, the second information including the measured expiratory opening pressure and the measured inspiratory opening pressure; S14, determining the pass / fail status based on the first and second information, and outputting the calibration result.

[0012] Furthermore, in step S11, the reference temperature is typically set to 20°C.

[0013] Furthermore, in step S13, an adaptive variable speed pressurization method is adopted, with an initial pressurization rate of 0.3 kPa / s-0.5 kPa / s. When the pressure reaches 70% of the expected set pressure, the rate linearly decreases to 0.05 kPa / s-0.1 kPa / s.

[0014] Furthermore, the verification results include the measured value of the target temperature, the correction value, and the pass / fail determination.

[0015] Compared with existing technologies, the technical effects achieved by this solution are as follows: In step S11, the ambient temperature is obtained through an ambient temperature sensor, and the initial and real-time valve body temperatures are obtained through multiple temperature sensors attached to the outer wall of the breathing valve. The target temperature is input by the user or automatically set by the system to the simulated operating temperature or a reference temperature. In step S12, the temperature adjustment of the breathing method under test is driven by a controller, and the valve body temperature is monitored in real time to form a closed-loop feedback. In step S13, the pressure calibration test includes positive pressure calibration and negative pressure calibration, and the pressure, flow rate, and valve disc displacement signals are collected simultaneously to jointly determine the valve disc opening and reseating times. In step S14, the pass / fail determination is based on a combination of the first and second information. This solution, by actively acquiring valve body temperature information and performing closed-loop temperature adjustment, places the pressure calibration under target conditions, fundamentally eliminating the interference of ambient temperature on the breathing valve opening pressure and solving the problem of incomparable temperature calibration results in different seasons.

[0016] In one technical solution of the present invention, step S12 further includes: calculating the difference between the initial temperature and the target temperature of the valve body as ΔT; adjusting the real-time temperature of the valve body to the target temperature specifically includes: when ΔT>5℃, adopting a first control mode for the breathing valve under test; when 1℃≤ΔT≤5℃, adopting a second control mode for the breathing valve under test; when 0.3℃<ΔT≤1℃, adopting a third control mode for the breathing valve under test; and when ΔT≤0.3℃, stopping the temperature adjustment of the breathing valve under test.

[0017] Furthermore, the first regulatory mode is the emphasis on control.

[0018] Furthermore, energy-saving control modes.

[0019] Further, PID control.

[0020] Furthermore, the increase or decrease of the valve body temperature is achieved by the controller driving the temperature regulation device, which can adopt any one or more of the following combinations: a semiconductor chip based on the Peltier effect, which switches between the heating and cooling surfaces by changing the direction of the current; a heat pump system based on a vapor compression cycle, which switches between cooling and heating by switching the refrigerant flow through a four-way reversing valve; an integrated cooling and heating unit, which achieves bidirectional temperature control by dynamically switching between cooling and heating modes using a single medium; and a semiconductor thermoelectric and vapor compression composite system, which takes into account both rapid response and wide temperature range regulation capability.

[0021] Compared with existing technologies, the technical effects achieved by this solution are as follows: In step S12, the difference ΔT between the initial temperature and the target temperature of the valve body is calculated, and different control modes are selected based on the magnitude of ΔT: when ΔT is greater than 5℃, a high-power control mode is used to rapidly heat up or cool down at maximum power; when ΔT is between 1℃ and 5℃, an energy-saving control mode is used to reduce power and save energy; when ΔT is between 0.3℃ and 1℃, PID fine adjustment is used to prevent temperature overshoot, i.e., temperature drift; when ΔT does not exceed 0.3℃, temperature adjustment is stopped. Based on the intelligent matching control strategy according to the temperature difference, a rapid response shortens the preparation time when the temperature difference is large, and power is reduced to save energy when the temperature difference is small. Simultaneously, PID fine adjustment prevents temperature overshoot, achieving a balance between speed, energy saving, and stability. Furthermore, the temperature control device can adopt various bidirectional temperature control technologies, exhibiting good versatility and feasibility.

[0022] In one technical solution of the present invention, step S13, performing a pressure verification test on the breathing valve under test, specifically includes: performing a positive pressure verification test and a negative pressure verification test on the breathing valve under test; wherein, the positive pressure verification test on the breathing valve under test further includes: the controller activating the gas temperature regulating component; the gas temperature regulating component includes: a semiconductor plate and a heat-conducting plate, the semiconductor plate being attached to the outer wall of the gas heat exchange chamber; one end of the heat-conducting plate being attached to the housing of the positive pressure source motor or the housing of the negative pressure source motor, and the other end of the heat-conducting plate being attached to the outer wall of the gas heat exchange chamber.

[0023] Compared with existing technologies, the technical effects achieved by this solution are as follows: In step S13, when performing positive or negative pressure calibration on the breathing valve, the controller simultaneously activates the gas temperature regulation component. This component includes a heat-conducting sheet attached to the housing of the positive or negative pressure source motor and a semiconductor sheet attached to the outer wall of the gas heat exchange chamber. For example, during positive pressure calibration, the gas temperature regulation component heats or cools the gas entering the breathing valve under test, ensuring the gas temperature matches the target temperature of the valve body. The gas temperature regulation component operates independently of the valve body temperature control and is specifically designed to regulate the temperature of the calibration gas flowing through the pipeline, preventing changes in gas density due to ambient temperature from affecting pressure measurement accuracy. The heat-conducting sheet recovers waste heat from the motor to assist in heating the gas, while the semiconductor sheet actively and precisely controls the temperature. Together, they rapidly stabilize the calibration gas temperature within the set range, further eliminating interference from gas temperature in determining the set pressure.

[0024] In one technical solution of the present invention, step S14, which involves determining the pass / fail status based on the first information and the second information, specifically includes: S141, obtaining the coefficient of thermal expansion α; S142, obtaining the correction pressure based on the coefficient of thermal expansion and the first information; S143, comparing the correction pressure with the second information, and determining that the pressure verification test of the breathing valve under test is qualified when the deviation between the correction pressure and the second information is ≤5%.

[0025] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: In step S141, the coefficient of thermal expansion α is obtained, and this coefficient can be identified online or called from a preset database; in step S142, the corrected pressure is calculated based on α, the target temperature, the reference temperature, and the measured opening pressure; in step S143, the corrected pressure is compared with the standard exhalation opening pressure or the standard inhalation opening pressure. When the relative deviation does not exceed 5%, it is determined to be qualified, otherwise it is determined to be unqualified. Through temperature compensation correction, the opening pressures measured at different target temperatures are uniformly converted to the equivalent pressures at the reference temperature, enabling the calibration result to be directly compared with the nominal value on the nameplate of the breathing valve to be tested, eliminating the deviation caused by the inability to accurately control the valve body temperature during calibration, and improving the accuracy of the pass / fail determination.

[0026] In one technical solution of the present invention, step S141 for obtaining the coefficient of thermal expansion α specifically includes: adjusting the real-time temperature of the valve body of the breathing valve to be tested to the perturbation temperature, synchronously measuring the displacement of the valve flap of the breathing valve to be tested, and obtaining α by least-squares fitting; wherein, the perturbation temperature = target temperature ± 2°C.

[0027] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: The specific method for obtaining the coefficient of thermal expansion α in step S141 is: after the valve body temperature is stabilized at the target temperature, the controller actively applies a temperature step perturbation of ±2°C, synchronously measures the small displacement change generated by the valve flap during this temperature change, records multiple sets of temperature change and displacement change data, and calculates α equal to the relative displacement change rate caused by unit temperature change by least-squares fitting of the linear relationship. The online real-time identification of the coefficient of thermal expansion is realized. The actual thermal expansion characteristics of the current breathing valve can be automatically fitted through active temperature perturbation and displacement response, adapting to valves of different brands and different degrees of wear, improving the accuracy and universality of temperature compensation correction, and avoiding errors caused by using fixed empirical values.

[0028] In one technical solution of the present invention, the calculation formula for the corrected pressure in step S142 is: P corr =P meas / [1 + α×(T target -T ref )]; Wherein, P corr is the corrected pressure, P meas is the measured exhalation opening pressure or the measured inhalation opening pressure, T target is the target temperature, and T ref is the reference temperature.

[0029] Compared with existing technologies, the technical effects achieved by this solution are: the measured pressure is reversed to the reference temperature state, the calculation process is simple and fast, it is suitable for embedding into the controller for real-time operation, and the corrected pressure value has clear physical meaning and comparability, making it easy to quickly determine on site.

[0030] In one technical solution of the present invention, the verification method further includes: S21, performing a pressure relief operation on the breather valve to be tested; S22, obtaining the theoretical reseating pressure and the valve body pressure; S23, when the valve body pressure is lower than 80% of the theoretical reseating pressure, performing thermal cycle reseating assistance.

[0031] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: In addition to the conventional opening pressure verification, an automatic evaluation and anomaly handling mechanism for reseating performance is added. When the reseating pressure is too low, the system can actively intervene to avoid reseating failure due to low temperature or aging of seals, which would require manual disassembly and repair, thereby improving the automation level and first-time success rate of the verification process.

[0032] In one technical solution of the present invention, step S23, the thermal cycling reseating assistance specifically includes: raising the valve body temperature by 3°C-8°C and maintaining it for 10s-30s, then restoring it at a rate not exceeding 2°C / min, and then re-measuring the valve body pressure.

[0033] Compared with existing technologies, the technical effects achieved by this solution are as follows: This solution provides a mild and controllable thermomechanical assisted reset method. The small-amplitude heating will not cause thermal damage to the breather valve and accessories under test. The holding time is sufficient for the breather valve and accessories under test to restore their elasticity. The slow cooling avoids thermal stress impact. This operation can be automatically repeated, effectively solving the problem of valve disc non-reseating caused by hardening of the sealing ring, surface icing, or small particles in low-temperature environments. It significantly improves the success rate and accuracy of reseating pressure measurement under low-temperature conditions.

[0034] To achieve the second objective of this invention, the technical solution of this invention provides an online calibration device for a breathing valve, comprising: a data acquisition module for acquiring the ambient temperature, initial valve body temperature, real-time valve body temperature, target temperature, standard expiratory opening pressure, and standard inspiratory opening pressure of the breathing valve under test; a temperature control module for adjusting the real-time valve body temperature to the target temperature and maintaining a constant temperature; a pressure calibration module for performing positive and negative pressure calibration on the breathing valve to obtain the measured expiratory opening pressure and the measured inspiratory opening pressure; a pass / fail judgment module for correcting the measured pressure according to the target temperature, reference temperature, and coefficient of thermal expansion, and determining the deviation from the standard opening pressure; an output module for outputting the calibration results; and a controller electrically connected to the data acquisition module, temperature control module, pressure calibration module, pass / fail judgment module, and output module, respectively, for executing the online calibration method for a breathing valve according to any of the above technical solutions.

[0035] Furthermore, the data acquisition module consists of an ambient temperature sensor, multiple thermocouple temperature sensors attached to the outer wall of the valve body, and a human-machine interface; the temperature control module includes a temperature regulating device (such as a semiconductor chip, a vapor compression heat pump system, or a combined cooling and heating unit) for regulating the valve body temperature, and a heat-conducting plate and semiconductor chip assembly for regulating the gas temperature; the pressure calibration module includes a positive pressure source, a negative pressure source, a proportional pressure regulating valve, a pressure sensor, a differential pressure flow sensor, and a valve disc displacement sensor; the pass / fail judgment module has a built-in temperature compensation algorithm; the output module consists of an LCD display and a wireless communication unit; and the controller is electrically connected to each of the above modules.

[0036] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: This solution constructs a complete integrated hardware and software online verification device. Each module has a clear division of labor and works together with each other. The entire process, from data acquisition, multi-mode temperature control, adaptive pressurization, multi-parameter joint judgment and activation to temperature compensation correction and qualification judgment, is automated, reducing human operation errors and outputting structured verification reports, which facilitates rapid on-site decision-making and subsequent data traceability.

[0037] To achieve the third objective of this invention, the technical solution of this invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, is used to implement the online verification method for a breathing valve according to any of the above technical solutions.

[0038] Furthermore, the storage medium is a non-transitory computer-readable medium, including read-only memory, random access memory, flash memory, hard disk, or optical disk. After the program is loaded into the controller processor, it performs the following operations: reads data from the temperature and pressure sensors, selects the temperature control mode based on the temperature difference and outputs control signals to the temperature regulating device and motor driver, performs adaptive variable speed pressurization and acquires signals from the three sensors to determine valve opening, obtains the coefficient of thermal expansion and performs temperature compensation correction calculations, and outputs a pass / fail result.

[0039] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: the method of this invention is embedded in a computer-readable storage medium, which facilitates software deployment and version upgrades on various online calibration devices for breathing valves. It can realize the automated logic of temperature regulation, pressure calibration and compensation determination without modifying the hardware, thereby reducing the equipment development and production costs. At the same time, the storage medium can be copied and distributed independently of the device, which is conducive to the industrial promotion and standardized application of the technical solution.

[0040] The technical solution provided by this invention can achieve at least one of the following effects: (1) Eliminate the interference of ambient temperature on the calibration results, improve the accuracy and consistency of the set pressure measurement. By actively acquiring the valve body temperature and adjusting it to the target temperature in a closed loop, combined with the temperature compensation correction algorithm, the pressure measured at different temperatures is uniformly converted to the equivalent pressure at the reference temperature, which fundamentally solves the problem of incomparable calibration results caused by seasonal temperature differences, making the qualification judgment more scientific and reliable. (2) Realize multi-mode intelligent temperature control, take into account both rapid response and energy saving. Automatically switch between high-intensity control, energy-saving regulation and PID adjustment modes according to the target temperature difference. When the temperature difference is large, the full power is used to quickly heat up or cool down, and when the temperature difference is small, the power is reduced, significantly reducing the power consumption of the temperature control module and effectively preventing temperature drift, ensuring the accuracy and stability of temperature control. (3) Improve the success rate of reseating pressure measurement under low temperature conditions. When the reseating pressure is detected to be lower than 80% of the theoretical value, thermal cycling reseating assistance is performed. The reseating jam caused by valve disc adhesion or hardening of seal is eliminated by a small increase in temperature. The reseating performance can be retested without manual disassembly and repair, which improves the automation level and one-time success rate of the calibration process. (4) Construct a complete integrated online verification closed-loop process, from data acquisition, multi-mode temperature control, adaptive variable speed pressurization, multi-parameter joint judgment to temperature compensation correction and qualification judgment, the whole process is automated, reducing human operation errors, outputting structured verification reports, facilitating rapid on-site decision-making and subsequent data traceability. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of the present invention. For those skilled in the art, other embodiments and their accompanying drawings can be obtained based on the embodiments shown in these drawings without creative effort.

[0042] Figure 1 This is one of the flowcharts of an online calibration method for a breathing valve according to the present invention; Figure 2 This is the second flowchart of an online calibration method for a breathing valve according to the present invention; Figure 3 This is the third flowchart of an online calibration method for a breathing valve according to the present invention; Figure 4 This is a schematic diagram of the gas temperature regulating component in an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures: 11. Positive pressure source motor; 12. Negative pressure source motor; 13. Ring semiconductor chip; 14. Heat-conducting plate; 15. Gas heat exchange chamber. Detailed Implementation

[0044] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] The following reference Figures 1 to 4 The technical solutions of some embodiments of the present invention are described below.

[0046] Example 1: This example provides an online calibration method for a breathing valve, applied to the online calibration of a spring-loaded breathing valve in an atmospheric pressure storage tank. First, step S11 is executed to obtain the first information of the breathing valve under test. An ambient temperature sensor is placed near the breathing valve in a location without direct sunlight, and the ambient temperature is read as 28°C. Three thermocouple temperature sensors are evenly attached to the upper, middle, and lower positions of the outer wall of the breathing valve body, and the average value is taken as the initial valve body temperature, which is measured to be 29°C (because the temperature of the medium inside the tank is slightly higher than the ambient temperature). The operator inputs the target temperature through the human-machine interface; in this example, the target temperature is set to 20°C, i.e., the standard reference temperature. Simultaneously, the standard exhalation opening pressure specified on the breathing valve nameplate is input as 4.20 kPa, and the standard inhalation opening pressure as -0.50 kPa. The reference temperature in the first information is defaulted to 20°C by the system.

[0047] Then, step S12 is executed, adjusting the valve body temperature to the target temperature based on the ambient temperature, initial valve body temperature, and target temperature. The controller calculates the difference between the initial and target valve body temperatures as ΔT = 20 - 29 = -9℃, which is greater than 5℃ in absolute value; therefore, an active control mode is adopted. The controller drives the semiconductor chip (using a TEC1-12706 thermoelectric cooler) attached to the outer wall of the breather valve to operate at full power for cooling. Simultaneously, the controller reduces the speed of the positive pressure source motor to the minimum maintenance speed to reduce the heating of the valve body by the motor's waste heat, and assists the cooling fan to run at full speed. During the temperature adjustment process, the temperature sensor provides real-time feedback on the valve body temperature, forming a closed-loop control. After approximately 120 seconds, the valve body temperature drops to 20.2℃. At this point, the absolute value of ΔT is less than 0.3℃, and the controller stops active temperature adjustment and enters the heat preservation stage, where the valve body temperature stabilizes within the range of 20.1 ± 0.3℃.

[0048] Next, proceed to step S13 to perform a pressure calibration test on the breathing valve under test. First, a positive pressure calibration test is performed. The controller activates the gas temperature regulation component, such as... Figure 4 As shown, the gas temperature regulation component includes: a heat-conducting sheet 14 attached to the housings of the positive pressure source motor 11 and the negative pressure source motor 12, and an annular semiconductor sheet 13 attached to the outer wall of the gas heat exchange chamber 15. The heat-conducting sheet 14 is made of copper-graphite composite material with a thickness of 1.0 mm. Thermally conductive silicone grease is coated between the surfaces of the housings of the positive pressure source motor 11, the negative pressure source motor 12, and the outer wall of the gas heat exchange chamber 15. The heat-conducting sheet 14 is used to transfer the heat generated by the housings of the positive pressure source motor 11 and the negative pressure source motor 12 to the outer wall of the gas heat exchange chamber 15. During positive pressure calibration, the gas temperature regulation component is used to heat or cool the gas to ensure that the temperature of the gas entering the breather valve under test is consistent with the target temperature. The controller adopts an adaptive variable speed pressurization method: the initial pressurization rate is 0.4 kPa / s, and when the pressure reaches 70% of the expected set pressure of 4.20 kPa, i.e., 2.94 kPa, the rate linearly decreases to 0.08 kPa / s. Simultaneously, signals from the pressure sensor, differential pressure flow sensor, and valve displacement sensor are acquired in real time. When the pressure rises to 4.21 kPa, the pressure derivative dP / dt is detected to be 0.015 kPa / s (less than 0.02 kPa / s), and the flow derivative dQ / dt is detected to be 1.2 L / m³. 2 s (greater than 0.5 L / m 2s), the displacement change ΔD = 0.03 mm (greater than 0.02 mm). When all three conditions are met simultaneously, it is determined that the valve disc opens, and the measured exhalation opening pressure is recorded as 4.21 kPa. Subsequently, it automatically switches to the pressure relief mode with a pressure relief rate of 0.15 kPa / s. When the displacement sensor shows that the valve disc has fallen back to the initial position and the reading of the flow sensor is less than 0.1 L / s, the reseating pressure is recorded as 3.98 kPa. Since the reseating pressure is higher than 80% of the theoretical reseating pressure (3.80 kPa), there is no need to perform the thermal cycle reseating assistance. The negative pressure calibration test is carried out in the same way, and the measured inhalation opening pressure is -0.49 kPa.

[0049] Finally, step S14 is executed to make a pass / fail determination based on the first information and the second information. First, the thermal expansion coefficient α is obtained. In this embodiment, an online identification method is adopted: after the valve body temperature is stabilized at 20 °C, the controller actively applies a temperature step disturbance of ±2 °C, that is, first raises the valve body temperature by 2 °C through the semiconductor chip and maintains it for 5 s, then lowers it by 2 °C to restore, and simultaneously measures the tiny displacement change generated by the valve disc during this temperature change process. After recording multiple groups of data, α = 0.011 / °C is calculated by least squares fitting. Then, according to the corrected pressure calculation formula P corr =P meas / [1 + α×(T target -T ref )], where T target is the target temperature of 20 °C, T ref is the reference temperature of 20 °C, and the temperature difference is zero. Therefore, P corr =P meas = 4.21 kPa. Comparing the corrected pressure of 4.21 kPa with the standard exhalation opening pressure of 4.20 kPa, the relative deviation is 0.24%, which is less than 5%, so the positive pressure calibration is determined to be qualified. The negative pressure calibration is the same. The corrected pressure is -0.49 kPa. Comparing it with the standard negative pressure opening pressure of -0.50 kPa, the relative deviation is 2%, which is also less than 5%, so it is determined to be qualified. Finally, a calibration result report is output, including: the measured exhalation opening pressure of 4.21 kPa, the measured inhalation opening pressure of -0.49 kPa, the corrected pressure of 4.21 kPa, the reseating pressure of 3.98 kPa, and the pass / fail determination conclusion at the target temperature of 20 °C. The calibration report is displayed on the liquid crystal display screen and uploaded to the management platform via the wireless communication unit.

[0050] Example 2: This example demonstrates a temperature regulation method for scenarios with large temperature differences and requiring refrigeration, as well as the application of the thermal cycle reseating auxiliary function. First, step S11 is executed to obtain the first information. The ambient temperature sensor reading is 10℃, and the initial valve body temperature, measured by a temperature sensor attached to the outer wall of the valve body, is 11℃ (because the temperature of the medium inside the tank is slightly higher than the ambient temperature). The operator inputs a target temperature of -15℃ (simulating winter operating conditions), and simultaneously inputs a standard exhalation opening pressure of 4.20 kPa and a standard inhalation opening pressure of -0.50 kPa. The default reference temperature is 20℃.

[0051] Then, step S12 is executed to adjust the valve body temperature to the target temperature in real time. The controller calculates ΔT = target temperature (-15℃) minus the initial valve body temperature (11℃), which equals -26℃. Since the absolute value is greater than 5℃, the active control mode (cooling direction) is adopted. The controller drives the semiconductor chip attached to the outer wall of the valve body to run at full power for cooling. At the same time, the controller reduces the speed of the positive pressure source motor to the minimum maintenance speed to reduce the heating of the valve body by the motor's waste heat, and the auxiliary cooling fan runs at full speed. During the temperature adjustment process, the temperature sensor provides real-time feedback on the valve body temperature, forming a closed-loop control. After about 180 seconds, the valve body temperature drops to -15.2℃. At this time, the absolute value of ΔT is less than 0.3℃, and the controller stops active temperature adjustment and enters the heat preservation stage. The valve body temperature stabilizes within the range of -15.1±0.3℃.

[0052] Next, step S13 is executed to perform a pressure calibration test on the breathing valve under test. The controller adopts an adaptive variable-speed pressurization method: the initial pressurization rate is 0.35 kPa / s, and when the pressure reaches 70% of the expected set pressure of 4.20 kPa, i.e., 2.94 kPa, the rate linearly decreases to 0.07 kPa / s. Simultaneously, signals from the pressure sensor, the differential pressure flow sensor, and the valve displacement sensor are acquired in real time. When the pressure rises to 4.68 kPa, the pressure differential dP / dt is detected to be 0.018 kPa / s (less than 0.02 kPa / s), the flow differential dQ / dt is detected to be 1.5 L / m²s (greater than 0.5 L / m²s), and the displacement change ΔD is detected to be 0.04 mm (greater than 0.02 mm). Since all three conditions are met simultaneously, the valve is determined to be open, and the measured expiratory opening pressure is recorded as 4.68 kPa. The system then automatically switched to pressure relief mode at a rate of 0.15 kPa / s. When the displacement sensor indicated that the valve disc had returned to its initial position and the flow sensor reading was less than 0.1 L / s, the reseating pressure was recorded as 2.90 kPa. The theoretical reseating pressure, calculated as 80% of the opening pressure of 4.68 kPa, was 3.74 kPa. The measured reseating pressure of 2.90 kPa was lower than 80% of 3.74 kPa, i.e., 2.99 kPa, thus triggering thermal cycling reseating assistance. The controller performed thermal cycling reseating assistance: raising the valve body temperature from -15℃ to -10℃ by 5℃ at a rate of 2.5℃ / min, holding for 20 seconds, and then slowly restoring it to -15℃ at a rate of 1.5℃ / min, while simultaneously maintaining slow pressure relief. After the temperature stabilized, the reseating pressure was measured again, rising to 3.62 kPa, which was higher than 2.99 kPa, indicating that reseating had returned to normal.

[0053] Finally, step S14 is executed to determine the pass / fail status based on the first and second information. First, the thermal expansion coefficient α is obtained. After the valve body temperature stabilizes at -15℃, the controller actively applies a ±2℃ temperature step disturbance; that is, the valve body temperature is first raised by 2℃ and held for 5 seconds via the semiconductor chip, then lowered by 2℃ to restore normal temperature, while simultaneously measuring the minute displacement change of the valve disc during this temperature change. After recording multiple sets of data, α = 0.0105 / ℃ is calculated using the least squares fitting method. Then, the corrected pressure calculation formula P is used. corr =P meas / [1+α×(T target -T ref )], where T target -15℃, T refThe temperature is 20℃, with a temperature difference of -35℃. The calculated Pcorr ≈ 7.40 kPa. Comparing the corrected pressure of 7.40 kPa with the standard expiratory opening pressure of 4.20 kPa, the relative deviation is 76%, which is greater than 5%, thus deemed unqualified. The final calibration result report includes: the measured expiratory opening pressure at the target temperature of -15℃ (4.68 kPa), the corrected pressure (7.40 kPa), the initial reseating pressure (2.90 kPa), the reseating pressure after thermal cycling (3.62 kPa), and the unqualified conclusion. The calibration report is displayed on an LCD screen and uploaded to the management platform via a wireless communication unit.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims, not by the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for online calibration of a breathing valve, characterized in that, The verification method includes: S11. Obtain the first information of the breathing valve to be tested, the first information including: ambient temperature, initial temperature of valve body, real-time temperature of valve body, target temperature, reference temperature, standard expiratory opening pressure and standard inspiratory opening pressure; S12. Adjust the real-time temperature of the valve body to the target temperature based on the ambient temperature, the initial temperature of the valve body, and the target temperature; S13. Perform a pressure calibration test on the breathing valve to be tested to obtain second information, the second information including the measurement of expiratory opening pressure and the measurement of inspiratory opening pressure; S14. Make a qualification determination based on the first information and the second information, and output the verification result.

2. The online calibration method for a breathing valve according to claim 1, characterized in that, Step S12 further includes: calculating the difference between the initial temperature of the valve body and the target temperature as ΔT; Adjusting the valve body temperature to the target temperature in real time specifically includes: When ΔT>5℃, the first control mode is adopted for the breathing valve under test; When 1℃≤ΔT≤5℃, the second control mode is adopted for the breathing valve under test; When 0.3℃ < ΔT ≤ 1℃, the third control mode is adopted for the breathing valve under test; When ΔT≤0.3℃, stop adjusting the temperature of the breather valve under test.

3. The online calibration method for a breathing valve according to claim 1, characterized in that, The pressure verification test performed on the breathing valve under test in step S13 specifically includes: performing a positive pressure verification test and a negative pressure verification test on the breathing valve under test. The positive pressure verification test of the breathing valve under test also includes: the controller activating the gas temperature regulation component; The gas temperature regulating component includes: a semiconductor chip and a heat-conducting chip. The semiconductor chip is attached to the outer wall of the gas heat exchange chamber. One end of the heat-conducting chip is attached to the housing of a positive pressure source motor or a negative pressure source motor, and the other end of the heat-conducting chip is attached to the outer wall of the gas heat exchange chamber.

4. The online calibration method for a breathing valve according to claim 1, characterized in that, Step S14, which involves determining eligibility based on the first and second information, specifically includes: S141. Obtain the coefficient of thermal expansion α; S142. Based on the thermal expansion coefficient and the first information, obtain the corrected pressure; S143. Compare the corrected pressure with the second information. If the deviation between the corrected pressure and the second information is ≤5%, the pressure verification test of the breathing valve under test is deemed qualified.

5. The online calibration method for a breathing valve according to claim 4, characterized in that, The step S141 of obtaining the coefficient of thermal expansion α specifically includes: adjusting the real-time temperature of the valve body of the breathing valve under test to the disturbance temperature, simultaneously measuring the valve disc displacement of the breathing valve under test, and obtaining α by least squares fitting. Wherein, the disturbance temperature = target temperature ±2℃.

6. The online calibration method for a breathing valve according to claim 4, characterized in that, The formula for calculating the correction pressure in step S142 is as follows: P corr =P meas / [1+α×(T target -T ref )]; Among them, P corr To correct the pressure, P meas To measure expiratory opening pressure or inspiratory opening pressure, T target For the target temperature, T ref This is the reference temperature.

7. The method for online calibration of a breathing valve according to any one of claims 1-6, characterized in that, The verification method further includes: S21. Perform a pressure relief operation on the breathing valve to be tested; S22. Obtain the theoretical reseating pressure and valve body pressure; S23. When the valve body pressure is lower than 80% of the theoretical reseating pressure, perform thermal cycle reseating assistance.

8. The online calibration method for a breathing valve according to claim 7, characterized in that, In step S23, the thermal cycling reseating assistance specifically includes: raising the valve body temperature by 3℃-8℃ and maintaining it for 10s-30s, then restoring it at a rate not exceeding 2℃ / min, and then re-measuring the valve body pressure.

9. An online calibration device for a breathing valve, characterized in that, include: The data acquisition module is used to acquire the ambient temperature, initial temperature of the valve body, real-time temperature of the valve body, target temperature, standard expiratory opening pressure and standard inspiratory opening pressure of the breathing valve under test. A temperature control module is used to adjust the valve body temperature to the target temperature in real time and maintain it at a constant temperature. A pressure calibration module is used to perform positive and negative pressure calibration on the breathing valve to obtain the measured expiratory opening pressure and the measured inspiratory opening pressure. The pass / fail judgment module is used to correct the measured pressure based on the target temperature, reference temperature, and coefficient of thermal expansion, and to determine the deviation from the standard opening pressure. The output module is used to output the verification result; The controller is electrically connected to the data acquisition module, the temperature control module, the pressure verification module, the pass / fail determination module, and the output module, respectively, and is used to execute the online verification method for the breathing valve as described in any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed by a processor, is used to implement the online verification method for the breathing valve according to any one of claims 1-8.

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