A quick-opening door type pressure vessel safety interlocking test system and detection method

Abstract

This invention discloses a safety interlock testing system and method for quick-opening pressure vessels. It simulates pressurized conditions by using an external pressure supply module, collects dynamic pressure signals using a high-frequency pressure sensor, and combines this with second-order derivative analysis to achieve millisecond-level non-invasive determination of the safety pin locking status. This system completely avoids the explosion risk of traditional testing methods, protects the lives of special equipment inspection personnel, and improves testing efficiency by more than 10 times. It is particularly suitable for the periodic inspection of quick-opening pressure vessels in the medical, food, and chemical industries.

Description

Technical Field

[0001] This invention relates to the field of special equipment testing, specifically to a safety interlock testing system and method for quick-opening pressure vessels. Background technology:

[0002] During the periodic inspection of quick-opening pressure vessels, it is necessary to test the locking reliability of their quick-opening safety interlock devices (such as safety pins). Traditional quick-opening door testing methods have the following drawbacks:

[0003] 1. High risk: Traditional testing methods require simulating an operator trying to open a quick-opening door under pressure inside the container. If the safety interlock fails, the quick-opening door will open and cause an explosion, resulting in casualties. Therefore, the test is extremely risky.

[0004] 2. Inefficiency: Each test requires a complete pressurization and depressurization cycle, which can take several hours;

[0005] 3. Subjectivity: Relying on manual visual judgment of the safety pin's movement status, it is prone to misjudgment and missed detection.

[0006] In summary, existing safety interlock testing systems and methods for quick-opening pressure vessels have many shortcomings. Therefore, developing a safety interlock testing system and methods for quick-opening pressure vessels has significant practical importance and application value. Summary of the Invention

[0007] This invention aims to provide a safety interlock testing system for quick-opening pressure vessels, comprising: an external pressure supply module, an intelligent control module, and a safety interlock status determination module;

[0008] The external pressure supply module includes a high-pressure gas source; the output end of the high-pressure gas source is connected to a high-pressure hose, on which a servo proportional valve, an upstream pressure sensor, a temperature sensor, a downstream pressure sensor, and a quick connector are sequentially installed; the upstream pressure sensor is used to detect the output pressure of the high-pressure gas source, and the downstream pressure sensor is used to detect the pressure at the safety pin inlet of the device under test; the temperature sensor is used to correct the gas pressure value in real time; the quick connector is used to connect to the inlet of the safety pin control pipeline, and the servo proportional valve is used to control the output pressure of the high-pressure gas source;

[0009] The intelligent control module includes a data acquisition card, a controller, and a human-machine interface (HMI). The data acquisition card communicates with the servo proportional valve, upstream pressure sensor, temperature sensor, downstream pressure sensor, and controller, and is used to acquire data from these sensors. The controller calculates the second derivative of the pressure. The HMI, data acquisition card, and servo proportional valve communicate with the controller, and the HMI displays pressure curves and diagnostic results. The upstream pressure sensor detects the output pressure of the high-pressure gas source to control the servo valve's opening. The downstream pressure sensor detects the pressure at the safety pin inlet.

[0010] The safety interlock status determination module is connected to the controller. The safety interlock status determination module is used to determine the safety pin action status by the sudden change of the second derivative of the pressure curve, and the controller generates a corresponding detection report.

[0011] Furthermore, both the upstream and downstream pressure sensors are high-frequency pressure sensors (1kHz). Based on the high-frequency pressure sensor (1kHz) and real-time second derivative calculation, the status determination can be completed within 50ms after the safety pin is activated.

[0012] Furthermore, the temperature sensor is a PT100 platinum resistance thermometer, used to correct the gas pressure value in real time.

[0013] Furthermore, the controller is an embedded controller.

[0014] Furthermore, a high-pressure gas source can be provided for the gas storage tank.

[0015] A testing method for a safety interlock testing system for a quick-opening pressure vessel includes the following steps:

[0016] (1) Connect the high-pressure gas source to the inlet of the safety pin control pipeline through a quick-connect coupling;

[0017] (2) Inject gas into the pipeline at a preset rate and simultaneously collect the upstream and downstream pressures to obtain the upstream pressure P1 and the downstream pressure P2.

[0018] (3) Calculate the second derivative of pressure from P2 data in real time. based on Negative mutation and pressure difference threshold determine the safety pin locking status;

[0019] (4) Generate a test report based on the test results.

[0020] Furthermore, P1 is the output pressure of the high-pressure air source, and P2 is the pressure at the safety pin inlet.

[0021] In one embodiment of the present invention, in step (3), when 0 ≤ P2 ≤ P0, P0 is the nominal operating pressure, if the detection And |P1-P2|≤5%P0, the safety pin is judged to be normally locked;

[0022] If |P1-P2|>5%P0 continues for more than 6 seconds, it indicates an internal leak in the interlock, which is deemed a failure and triggers an emergency pressure relief. The emergency pressure relief is triggered by shutting off the air supply through the servo proportional valve, stopping the pressurization of the safety pin control line, and ending the test.

[0023] If P2 > P0, the safety pin is determined to have not popped out, and the test is deemed unqualified.

[0024] Furthermore, P0 can be set manually.

[0025] Furthermore, if the result of the test in step (4) is that the safety pin is normally locked, a test report is generated with the conclusion "Safety interlock meets requirements"; if the result is failure and triggers emergency pressure relief, "Internal leakage of safety interlock device" is generated; if it is determined that the safety pin has not popped out, "Safety pin not popped out" is generated.

[0026] Furthermore, the rate in step (2) is 0.0001-0.001 MPa / s.

[0027] Furthermore, gas pressure is affected by temperature (ideal gas law PV = nRT), and the corrected formula for gas pressure is as follows:

[0028]

[0029] (T 参考 (The standard operating temperature is usually taken as 20℃)

[0030] By correcting the upstream pressure P1 and downstream pressure P2 using the above formula, high-precision and high-reliability detection can be achieved.

[0031] This invention calculates the second derivative using real-time downstream pressure data to directly capture the transient characteristics of the safety pin locking mechanism. Combined with a temperature compensation algorithm correction mechanism, it achieves high-precision, high-reliability non-invasive detection. This design balances detection sensitivity and anti-interference capability, with a false positive rate controllable to <0.5%.

[0032] The beneficial effects of this invention are as follows:

[0033] This invention simulates the pressurized working condition of a container by using an external pressure supply module, collects dynamic pressure signals using a high-frequency pressure sensor, and combines second-order derivative analysis to achieve millisecond-level non-intrusive determination of the safety pin locking state.

[0034] This invention completely avoids the explosion risk of traditional testing, protects the lives of special equipment testing personnel, and improves testing efficiency by more than 10 times. It is especially suitable for the periodic inspection of quick-opening containers in the medical, food, and chemical industries.

[0035] This invention does not rely on manual visual judgment of the safety pin's action status, making it less prone to misjudgment and missed detection, thus reducing human error. Attached image description:

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a quick-opening pressure vessel safety interlock testing system provided in an embodiment of the present invention;

[0038] Figure 2 This is a connection diagram of a quick-opening pressure vessel safety interlock testing system provided in an embodiment of the present invention; Specific implementation plan:

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The technical solutions provided by various embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0040] Please see Figure 1-2 This invention provides a safety interlock testing system for a quick-opening pressure vessel, comprising: an external pressure supply module, an intelligent control module, and a safety interlock status determination module.

[0041] The external pressure supply module includes a high-pressure gas source; the output end of the high-pressure gas source is connected to a high-pressure hose, on which a servo proportional valve, an upstream pressure sensor, a temperature sensor, a downstream pressure sensor, and a quick connector are sequentially installed; the upstream pressure sensor is used to detect the pressure of the high-pressure gas source, and the downstream pressure sensor is used to detect the pressure at the safety pin inlet of the device under test; the temperature sensor is used to correct the gas pressure value in real time; the quick connector is used to connect to the inlet of the safety pin control pipeline, and the servo proportional valve is used to control the output pressure of the high-pressure gas source;

[0042] The intelligent control module includes a data acquisition card, a controller, and a human-machine interface (HMI). The data acquisition card communicates with the servo proportional valve, upstream pressure sensor, temperature sensor, downstream pressure sensor, and controller, and is used to acquire data from these sensors. The controller calculates the second derivative of the pressure. The HMI, data acquisition card, and servo proportional valve communicate with the controller, and the HMI displays pressure curves and diagnostic results. The upstream pressure sensor detects the output pressure of the high-pressure gas source to control the servo valve's opening. The downstream pressure sensor detects the pressure at the safety pin inlet.

[0043] The safety interlock status determination module is connected to the controller. The safety interlock status determination module is used to determine the safety pin action status by the sudden change of the second derivative of the pressure curve, and the controller generates a corresponding detection report.

[0044] Furthermore, both the upstream and downstream pressure sensors are high-frequency pressure sensors (1kHz). Based on the high-frequency pressure sensor (1kHz) and real-time second derivative calculation, the status determination can be completed within 50ms after the safety pin is activated.

[0045] Furthermore, the temperature sensor is a PT100 platinum resistance thermometer, used to correct the gas pressure value in real time.

[0046] Furthermore, the controller is an embedded controller.

[0047] Furthermore, a high-pressure gas source can be provided for the gas storage tank.

[0048] A testing method for a safety interlock testing system for a quick-opening pressure vessel includes the following steps:

[0049] (1) Connect the high-pressure gas source to the inlet of the safety pin control pipeline through a quick-connect coupling;

[0050] (2) Inject gas into the pipeline at a preset rate and simultaneously collect the upstream and downstream pressures to obtain the upstream pressure P1 and the downstream pressure P2.

[0051] (3) Calculate the second derivative of pressure from P2 data in real time. based on Negative mutation and pressure difference threshold determine the safety pin locking status;

[0052] (4) Generate a test report based on the test results.

[0053] Furthermore, P1 is the output pressure of the high-pressure air source, and P2 is the pressure at the safety pin inlet.

[0054] In one embodiment of the present invention, in step (3), when 0 ≤ P2 ≤ P0, P0 is the nominal operating pressure, if the detection And |P1-P2|≤5%P0, the safety pin is judged to be normally locked;

[0055] If |P1-P2|>5%P0 continues for more than 6 seconds, it indicates an internal leak in the interlock, which is deemed a failure and triggers an emergency pressure relief.

[0056] If P2 > P0, the safety pin is determined to have not popped out, and the test is deemed unqualified.

[0057] Furthermore, P0 can be set manually.

[0058] In one embodiment of the present invention, if the result of the detection in step (4) is that the safety pin is normally locked, a detection report is generated, and the conclusion is "the safety interlock meets the requirements"; if the result is failure and triggers emergency pressure relief, "internal leakage of the safety interlock device" is generated; if it is determined that the safety pin has not popped out, "safety pin has not popped out" is generated.

[0059] In one embodiment of the present invention, the rate in step (2) is 0.0001-0.001 MPa / s.

[0060] In one embodiment of the present invention, the gas pressure is affected by temperature (ideal gas law PV=nRT), and the gas pressure value is corrected using the following formula:

[0061]

[0062] (T 参考 (The standard operating temperature is usually taken as 20℃)

[0063] By correcting the upstream pressure P1 and downstream pressure P2 using the above formula, high-precision and high-reliability detection can be achieved.

[0064] This invention calculates the second derivative using real-time downstream pressure data to directly capture the transient characteristics of the safety pin locking mechanism. Combined with a temperature compensation algorithm correction mechanism, it achieves high-precision, high-reliability non-invasive detection. This design balances detection sensitivity and anti-interference capability, with a false positive rate controllable to <0.5%.

[0065] Experimental example:

[0066] This invention was used to test a pulsed vacuum sterilizer in a hospital.

[0067] 1. Parameter settings:

[0068] Nominal operating pressure P0 = 0.025 MPa

[0069] Test pressure range: 0.01-0.04 MPa (stepped pressure increase, increment: 0.0001 MPa)

[0070] 2. Testing process:

[0071] At 0.02 MPa, the system detected d²P / dt² = -0.018 MPa / s. 2 The locking was determined to be successful;

[0072] When the pressure was 0.022 MPa, |P1-P2| was found to be 5.7% P0, which lasted for 6 seconds, triggering an alarm and indicating a minor leak in the pipeline.

[0073] 3. Benefit Comparison:

[0074] The detection time has been reduced from 2 hours using traditional methods to 5 minutes, avoiding the risk of two potential explosions.

[0075] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A safety interlock testing system for a quick-opening pressure vessel, characterized in that, include: External pressure supply module, intelligent control module, and safety interlock status determination module; The external pressure supply module includes a high-pressure gas source; the output end of the high-pressure gas source is connected to a high-pressure hose, on which a servo proportional valve, an upstream pressure sensor, a temperature sensor, a downstream pressure sensor, and a quick connector are sequentially installed; the upstream pressure sensor is used to detect the output pressure of the high-pressure gas source, and the downstream pressure sensor is used to detect the pressure at the safety pin inlet of the device under test; the temperature sensor is used to correct the gas pressure value in real time; the quick connector is used to connect to the inlet of the safety pin control pipeline, and the servo proportional valve is used to adjust the output pressure of the high-pressure gas source; The intelligent control module includes a data acquisition card, a controller, and a human-machine interface (HMI). The data acquisition card communicates with the servo proportional valve, upstream pressure sensor, temperature sensor, downstream pressure sensor, and controller, and is used to acquire data from these sensors. The controller calculates the second derivative of the pressure. The HMI, data acquisition card, and servo proportional valve communicate with the controller, and the HMI displays pressure curves and diagnostic results. The upstream pressure sensor detects the output pressure of the high-pressure gas source to control the servo valve's opening. The downstream pressure sensor is used to detect the pressure at the safety pin inlet; The safety interlock status determination module is connected to the controller. The safety interlock status determination module is used to determine the safety pin action status by the sudden change of the second derivative of the pressure curve, and the controller generates a corresponding detection report.

2. The testing method for the quick-opening pressure vessel safety interlock testing system according to claim 1, characterized in that, Includes the following steps: (1) Connect the high-pressure gas source to the inlet of the safety pin control pipeline through a quick-connect coupling; (2) Inject gas into the pipeline at a preset rate and simultaneously collect the upstream and downstream pressures to obtain the upstream pressure P1 and the downstream pressure P2. (3) Calculate the second derivative of pressure from P2 data in real time. based on Negative mutation and pressure difference threshold determine the safety pin locking status; (4) Generate a test report based on the test results.

3. The testing method for the quick-opening pressure vessel safety interlock testing system according to claim 2, characterized in that, In step (3), when 0 ≤ P2 ≤ P0, P0 is the nominal operating pressure. If the detection... And |P1-P2|≤5%P0, the safety pin is judged to be normally locked; If |P1-P2|>5%P0 continues for more than 6 seconds, it indicates an internal leak in the interlock, which is deemed a failure and triggers an emergency pressure relief. The emergency pressure relief is triggered by shutting off the air supply through the servo proportional valve, stopping pressurization into the safety pin control line, and ending the test. If P2 > P0, the safety pin is determined to have not popped out, and the test is deemed unqualified.

4. The testing method for the quick-opening pressure vessel safety interlock testing system according to claim 2, characterized in that, If the result of the test in step (4) is that the safety pin is normally locked, a test report is generated and the conclusion is "the safety interlock meets the requirements"; if the result is failure and triggers emergency pressure relief, "the safety interlock device leaks internally" is generated. If it is determined that the safety pin has not popped out, then "Safety pin not popped out" will be generated.

5. The testing method for the quick-opening pressure vessel safety interlock testing system according to claim 2, characterized in that, The rate in step (2) is 0.0001-0.001 MPa / s.

6. The testing method for the quick-opening pressure vessel safety interlock testing system according to claim 2, characterized in that, Gas pressure is affected by temperature (ideal gas law PV=nRT), gas pressure value, correction formula: (T 参考 (The standard operating temperature is usually taken as 20℃) The upstream pressure P1 and downstream pressure P2 are corrected using the above formula.

Images