Safety interlocking test system and detection method for quick-opening-door type pressure vessel

Abstract

The invention discloses a quick-opening-door type pressure vessel safety interlocking test system and a detection method, which are characterized in that an external pressure supply module is used for simulating the under-pressure working condition of a vessel, a high-frequency pressure sensor is used for collecting dynamic pressure signals, and second derivative analysis is combined to realize millisecond-level non-intrusive judgment of the locking state of a safety pin. The system thoroughly avoids the explosion risk of traditional detection, protects the life safety of special equipment detection personnel, improves the detection efficiency by more than 10 times, and is particularly suitable for regular inspection of quick-opening pressure vessels in the fields of medical treatment, food and chemical engineering.

Description

Technical field:

[0001] The present invention relates to the field of special equipment detection, and in particular to a safety interlock test system and a detection method for a quick-opening pressure vessel. Background technology:

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

[0003] 1. High risk: Traditional testing methods require simulating an operator attempting to open a quick-opening door when the container is under pressure. If the safety interlock fails, the quick-opening door will explode, causing casualties. Therefore, the test risk is extremely high.

[0004] 2. Inefficiency: Each test requires a complete pressure increase and pressure reduction cycle, which takes up to several hours;

[0005] 3. Subjectivity: Relying on manual visual judgment of the safety pin's operating status can easily lead to misjudgment and missed inspections.

[0006] In summary, the existing quick-opening pressure vessel safety interlock test system and detection method have many shortcomings. Therefore, the development of a quick-opening pressure vessel safety interlock test system and detection method has important practical significance and application value. Summary of the invention:

[0007] The present invention aims to provide a safety interlock test system for a quick-opening pressure vessel, 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 provided; 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 being tested; 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-computer interaction interface. The data acquisition card is respectively connected to the servo proportional valve, upstream pressure sensor, temperature sensor, downstream pressure sensor, and controller, and is used to collect data from the servo proportional valve, upstream pressure sensor, temperature sensor, and downstream pressure sensor. The controller is used to calculate the second-order derivative of pressure. The human-computer interaction interface, the data acquisition card, and the servo proportional valve are connected to the controller, and the human-computer interaction interface is used to display pressure curves and diagnostic results. The upstream pressure sensor is used to detect the output pressure of the high-pressure gas source in order to control the servo valve opening. The downstream pressure sensor is used to detect the pressure at the safety pin inlet.

[0010] The safety interlock state determination module is connected to the controller for communication. The safety interlock state determination module is used to determine the safety pin action state through the second-order derivative mutation of the pressure curve and generate a corresponding detection report through the controller.

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

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

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

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

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

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

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

[0018] (3) Real-time calculation of the second-order derivative of pressure of P2 data based on The negative mutation and pressure difference threshold determine the locking state of the safety pin;

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

[0020] Furthermore, P1 is the output pressure of the high-pressure gas 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 And |P1-P2|≤5%P0, it is determined that the safety pin is locked normally;

[0022] If |P1-P2|>5%P0 lasts for more than 6 seconds, it indicates that the interlock has leaked internally, and the failure is judged and emergency pressure relief is triggered. Emergency pressure relief is triggered by shutting off the gas source through the servo proportional valve, stopping the pressurization of the safety pin control pipeline, and ending the test;

[0023] If P2>P0, it is determined that the safety pin has not popped out and the test fails.

[0024] Furthermore, P0 can be set manually.

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

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

[0027] Furthermore, the gas pressure is affected by temperature (ideal gas law PV = nRT), the gas pressure value, the correction formula is:

[0028]

[0029] (T 参考 is the standard operating temperature, usually 20℃)

[0030] The upstream pressure P1 and the downstream pressure P2 are corrected by the above formula to achieve high-precision and high-reliability detection.

[0031] This invention calculates the second-order derivative from real-time downstream pressure data, directly capturing the transient characteristics of the safety pin's closure. Combined with a temperature compensation algorithm, this method achieves highly accurate and reliable non-invasive detection. This design balances detection sensitivity with anti-interference capabilities, keeping the false positive rate to less than 0.5%.

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

[0033] The present invention simulates the pressurized working condition of the container through an external pressure supply module, uses a high-frequency pressure sensor to collect dynamic pressure signals, and combines second-order derivative analysis to achieve millisecond-level non-invasive judgment of the safety pin locking state.

[0034] The present invention completely avoids the explosion risk of traditional detection, protects the lives of special equipment inspectors, and improves detection efficiency by more than 10 times. It is particularly suitable for regular inspection of fast-opening containers in the medical, food, and chemical fields.

[0035] The present invention does not rely on manual visual judgment of the safety pin action state, is not prone to misjudgment or missed detection, and reduces human misjudgment. Description of the drawings:

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0037] Figure 1 A schematic structural diagram of a safety interlock test system for a quick-opening pressure vessel provided by an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the connection of a quick-opening pressure vessel safety interlock test system provided by an embodiment of the present invention; Specific implementation plan:

[0039] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. The technical solutions provided by each embodiment of the present invention are described in detail below in conjunction with the drawings.

[0040] See also Figure 1-2 , an embodiment of the present invention provides a quick-opening door pressure vessel safety interlock test system, comprising: an external pressure supply module, an intelligent control module, and a safety interlock state 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 provided; 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 being tested; 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-computer interaction interface. The data acquisition card is respectively connected to the servo proportional valve, upstream pressure sensor, temperature sensor, downstream pressure sensor, and controller, and is used to collect data from the servo proportional valve, upstream pressure sensor, temperature sensor, and downstream pressure sensor. The controller is used to calculate the second-order derivative of pressure. The human-computer interaction interface, the data acquisition card, and the servo proportional valve are connected to the controller, and the human-computer interaction interface is used to display pressure curves and diagnostic results. The upstream pressure sensor is used to detect the output pressure of the high-pressure gas source in order to control the servo valve opening. The downstream pressure sensor is used to detect the pressure at the safety pin inlet.

[0043] The safety interlock state determination module is connected to the controller for communication. The safety interlock state determination module is used to determine the safety pin action state through the second-order derivative mutation of the pressure curve and generate a corresponding detection report through the controller.

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

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

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

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

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

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

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

[0051] (3) Real-time calculation of the second-order derivative of pressure of P2 data based on The negative mutation and pressure difference threshold determine the locking state of the safety pin;

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

[0053] Furthermore, P1 is the output pressure of the high-pressure gas 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 And |P1-P2|≤5%P0, it is determined that the safety pin is locked normally;

[0055] If |P1-P2|>5%P0 lasts for more than 6 seconds, it indicates an internal leakage of the interlock, and the failure is judged and emergency pressure relief is triggered;

[0056] If P2>P0, it is determined that the safety pin has not popped out and the test fails.

[0057] Furthermore, P0 can be set manually.

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

[0061]

[0062] (T 参考 is the standard operating temperature, usually 20℃)

[0063] The upstream pressure P1 and the downstream pressure P2 are corrected by the above formula to achieve high-precision and high-reliability detection.

[0064] This invention calculates the second-order derivative from real-time downstream pressure data, directly capturing the transient characteristics of the safety pin's closure. Combined with a temperature compensation algorithm, this method achieves highly accurate and reliable non-invasive detection. This design balances detection sensitivity with anti-interference capabilities, keeping the false positive rate to less than 0.5%.

[0065] Experimental example:

[0066] The present invention is used to detect the pulsating vacuum sterilizer of a hospital

[0067] 1. Parameter settings:

[0068] οNominal operating pressure P0=0.025MPa

[0069] οTest pressure range 0.01-0.04MPa (step pressure increase, step length 0.0001MPa)

[0070] 2. Testing process:

[0071] At 0.02 MPa, the system detects d2P / dt2 = -0.018 MPa / s 2 , determine that the locking is successful;

[0072] At ο0.022MPa, it was found that |P1-P2|=5.7%P0, which lasted for 6 seconds, triggering an alarm and indicating a slight leak in the pipeline.

[0073] 3. Benefit comparison:

[0074] The detection time is shortened from 2 hours of traditional methods to 5 minutes, avoiding two potential explosion risks.

[0075] While the present invention has been generally described above, modifications and improvements are readily apparent to those skilled in the art. Therefore, modifications and improvements that do not depart from the spirit of the present invention are intended to be within the scope of the present invention.

Claims

1. A quick-opening pressure vessel safety interlock test system, characterized in that: include: External pressure supply module, intelligent control module, 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 provided; 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 being tested; 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-computer interaction interface. The data acquisition card is respectively connected to the servo proportional valve, upstream pressure sensor, temperature sensor, downstream pressure sensor, and controller, and is used to collect data from the servo proportional valve, upstream pressure sensor, temperature sensor, and downstream pressure sensor. The controller is used to calculate the second-order derivative of pressure. The human-computer interaction interface, the data acquisition card, and the servo proportional valve are connected to the controller, and the human-computer interaction interface is used to display pressure curves and diagnostic results. The upstream pressure sensor is used to detect the output pressure of the high-pressure gas source in order to control the servo valve to adjust the opening. The downstream pressure sensor is used to detect the pressure at the safety pin inlet; The safety interlock state determination module is connected to the controller for communication. The safety interlock state determination module is used to determine the safety pin action state through the second-order derivative mutation of the pressure curve and generate a corresponding detection report through the controller.

2. The detection method of the quick-opening door pressure vessel safety interlock test system according to claim 1, characterized in that: The following steps are involved: (1) Connect the high-pressure gas source to the inlet of the safety pin control pipeline through a quick-change connector; (2) Inject gas into the pipeline at a preset rate, and simultaneously collect upstream and downstream pressures to obtain the upstream pressure P1 and the downstream pressure P2; (3) Real-time calculation of the second-order derivative of pressure of P2 data based on The negative mutation and pressure difference threshold determine the locking state of the safety pin; (4) Generate a test report based on the test results.

3. The detection method of the safety interlock test system of the quick-opening pressure vessel according to claim 2, characterized in that: In step (3), when 0≤P2≤P0, P0 is the nominal operating pressure, if And |P1-P2|≤5%P0, it is determined that the safety pin is locked normally; If |P1-P2|>5%P0 lasts for more than 6 seconds, it indicates an internal leakage of the interlock, and the failure is judged and emergency pressure relief is triggered; Triggering emergency pressure relief means shutting off the gas source through the servo proportional valve, stopping the pressurization of the safety pin control pipeline, and ending the test; If P2>P0, it is determined that the safety pin has not popped out and the test fails.

4. The detection method of the safety interlock test system of a fast-opening pressure vessel according to claim 2, characterized in that: If the result of the test in step (4) is that the safety pin is locked normally, a test report is generated with the conclusion that "the safety interlock meets the requirements"; if the result is failure and emergency pressure relief is triggered, a "safety interlock device internal leakage" is generated; If it is determined that the safety pin has not popped out, "Safety pin has not popped out" is generated.

5. The detection method of the safety interlock test system of a fast-opening pressure vessel according to claim 2, characterized in that: The rate in step (2) is 0.0001-0.001 MPa / s.

6. The detection method of the safety interlock test system of a fast-opening pressure vessel 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 is the standard operating temperature, usually 20℃) The upstream pressure P1 and the downstream pressure P2 are corrected using the above formula.

Images