Detection device of safety relief equipment for low-temperature medium and test method thereof

Abstract

The invention discloses a detection device and a test method of safety relief equipment for a low-temperature medium, and relates to the technical field of detection devices.The detection device of the safety relief equipment for the low-temperature medium comprises a test container, a liquid inlet assembly and a detection assembly, the test container comprises a shell, and an inner cavity of the shell is a test cavity; a test port and a liquid inlet which are communicated with the test cavity are formed in the shell, and the test port is positioned at the top of the test container; the liquid inlet assembly comprises a liquid storage container and a liquid inlet valve, the liquid storage container is communicated with the test cavity through a liquid inlet, and the liquid inlet valve is arranged at the communication position of the liquid storage container and the test cavity; the detection assembly comprises a pressure detector and a plurality of temperature detectors, and the plurality of temperature detectors at least comprise a first temperature detector and a second temperature detector. The technical scheme provided by the invention aims to solve the problems of slow natural gasification pressure rise and low test efficiency caused by the existence of a heat insulation layer of a test container in the prior art, and can meet the requirement of the pressure rise rate at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and in particular to a detection device for a safety discharge device for a low-temperature medium and a testing method thereof. Background Art

[0002] Safety valves and bursting discs are important safety accessories for pressure-bearing special equipment. To ensure their safety performance meets technical requirements, they must undergo type testing. For example, safety valves for cryogenic media require a low-temperature setting test using liquid nitrogen as a medium during type testing. The operating principle is as follows: During the set pressure test, the safety valve is installed on the connection plate of the test container. Liquid or other low-temperature evaporation media is continuously passed through the pipeline to allow the safety valve to fully cool. The low-temperature stop valve of the liquid storage container is then closed, followed by the stop valve on the test container connection plate. This allows the cryogenic media in the pipeline to naturally vaporize and increase in pressure. The safety valve is then observed to meet the set pressure and to determine whether it can return to its seat after opening.

[0003] It is particularly important to emphasize that the pressure increase in the test vessel is achieved through natural vaporization. Natural vaporization is achieved through heat exchange. In the figure above, we can see that the test vessel has an insulation layer. Due to the presence of the insulation layer, heat exchange is reduced, and the natural vaporization pressure increases slowly, affecting the test efficiency.

[0004] During actual operation, we discovered that removing the insulation from the test vessel increases heat exchange and accelerates the natural vaporization pressure rise. However, the safety valve type test rules, GB / T12242, "Performance Test Methods for Pressure Test Devices," in Clause 5.4.2.2, stipulate that the flow meter method for measuring flow is as follows: Increase the pressure at the inlet of the pressure relief device. After the pressure reaches 90% of the expected set pressure, the pressure increase rate should not exceed 0.01 MPa / s. Observe and record the set pressure of the pressure relief device or safety valve and other required or relevant characteristic values. Here, the set pressure test requires: After the pressure reaches 90% of the expected set pressure, the pressure increase rate should not exceed 0.01 MPa / s. This is because a slow pressure increase rate facilitates pressure testing. Summary of the Invention

[0005] The main purpose of the present invention is to propose a detection device and a testing method for a safety discharge device for low-temperature media, aiming to solve the problems in the prior art such as slow increase in natural vaporization pressure and low test efficiency due to the presence of an insulation layer in the test container, while meeting the requirements of the pressure increase rate.

[0006] To achieve the above-mentioned object, the present invention proposes a detection device for a safety discharge device for a low-temperature medium, comprising: The test container comprises a shell, the inner cavity of the shell being a test cavity, the outer surface of the shell being exposed to enable heat exchange with the surrounding environment, and a test port and a liquid inlet being provided on the shell, the test port being located at the top of the test container for installation of a discharge device; a liquid inlet assembly, comprising a liquid storage container and a liquid inlet valve, wherein the liquid storage container is connected to the test cavity through the liquid inlet for storing a low-temperature medium, and the liquid inlet valve is provided at the connection between the liquid storage container and the test cavity for controlling the connection between the liquid storage container and the test cavity; and The detection component includes a pressure detector and multiple temperature detectors, wherein the pressure detector is used to detect the gas pressure of the test cavity, and the multiple temperature detectors include at least a first temperature detector and a second temperature detector, wherein the first temperature detector is used to detect the gas temperature of the test cavity, and the second temperature detector is used to detect the temperature of the safety relief device.

[0007] In one embodiment, the liquid inlet is provided with a plurality of liquid inlets, the plurality of liquid inlets including a first liquid inlet and a second liquid inlet, the first liquid inlet is located above the second liquid inlet, and the liquid storage container is connected to the test cavity through the first liquid inlet and the second liquid inlet respectively; Correspondingly, there are multiple liquid inlet valves, including a first liquid inlet valve and a second liquid inlet valve. The first liquid inlet valve is arranged on the pipeline between the liquid storage container and the first liquid inlet, and the second liquid inlet valve is arranged on the pipeline between the liquid storage container and the second liquid inlet.

[0008] In one embodiment, the liquid inlet assembly further includes a liquid inlet pipe, one end of which is in communication with the liquid storage container, and the other end of which passes through the liquid inlet and extends to the middle of the test cavity; The liquid inlet valve is arranged on the liquid inlet pipe and is located outside the shell.

[0009] In one embodiment, the housing is symmetrically arranged in an upper and lower direction, so that the test cavity is divided into an upper cavity and a lower cavity, the first liquid inlet is arranged in the upper cavity, and the second liquid inlet is arranged in the lower cavity; There are multiple liquid inlet pipes, and the multiple liquid inlet pipes include at least a first liquid inlet pipe and a second liquid inlet pipe. One end of the first liquid inlet pipe is connected to the liquid storage container, and the other end of the first liquid inlet pipe extends to the middle of the test cavity and close to the top of the shell through the first liquid inlet port. One end of the second liquid inlet pipe is connected to the liquid storage container, and the other end of the second liquid inlet pipe extends to the middle of the test cavity and close to the bottom of the shell through the second liquid inlet port.

[0010] In one embodiment, the detection device of the safety discharge equipment for low-temperature medium further includes a pressure relief valve, which is arranged on the top of the shell and communicates with the test cavity, and the pressure relief valve is used to discharge gas; and / or, The detection device of the safety discharge equipment for low-temperature medium further includes a drain valve, which is arranged at the bottom of the shell and communicates with the test cavity, and is used to discharge liquid.

[0011] A method for detecting a safety discharge device for a cryogenic medium comprises the following steps: Calculate the safe liquid intake according to the formula ; Inject the safe amount of liquid into the test cavity volume of cooling medium; Detecting, by the detection component, changes in pressure and temperature of the test cavity when heat exchange is performed in the environment in which it is located, and changes in temperature of the safety relief device when heat exchange is performed in the environment in which it is located; When the pressure detector 31 detects that the pressure of the test cavity reaches a preset value, the safety relief device is opened to exhaust the air, thereby completing the pressure test; Wherein, the safe liquid intake , , is the volume of the test cavity, For safety parameters, is the gas volume expansion coefficient of the cooling medium, is the liquid density of the cooling medium, is time and takes value 1, is the safe discharge volume, is the heating area of the shell, is the environmental condition coefficient. When the container is placed below the ground and covered with sand, F=0.3; when the container is placed on the ground, F=1.0. is the latent heat of vaporization of the liquid at the relief pressure.

[0012] In one embodiment, the cooling medium includes liquid nitrogen, and the safe liquid intake volume .

[0013] In one embodiment, at least two pressure detectors 31 are provided, and at least two first temperature detectors are provided; After the step of “detecting, by the detection component, the pressure and temperature changes of the test cavity when heat exchange is performed in the environment in which it is located, and the temperature changes of the safety relief device when heat exchange is performed in the environment in which it is located”, the method includes: Comparing data from the two pressure detectors 31 and the two first temperature sensors; If the data are consistent, record them and continue the test; If the data differ, the experiment is stopped.

[0014] In one embodiment, the liquid inlet is provided with a plurality of liquid inlets, the plurality of liquid inlets including a first liquid inlet and a second liquid inlet, the first liquid inlet is located above the second liquid inlet, and the liquid storage container is connected to the test cavity through the first liquid inlet and the second liquid inlet respectively; Correspondingly, the liquid inlet valve is also provided in plurality, and the plurality of liquid inlet valves include a first liquid inlet valve and a second liquid inlet valve, the first liquid inlet valve is provided between the liquid storage container and the first liquid inlet, and the second liquid inlet valve is provided between the liquid storage container and the second liquid inlet; The step of injecting the cooling medium into the test cavity according to the liquid inflow volume from the liquid storage container specifically includes: The first liquid inlet valve and the second liquid inlet valve are opened alternately to allow the cooling medium to be injected from the liquid storage container into the test cavity.

[0015] In one embodiment, the detection device of the safety discharge equipment for low-temperature medium further includes a pressure relief valve, which is arranged on the top of the shell and communicates with the test cavity. After the pressure detector 31 detects that the pressure of the test cavity reaches a preset value, the safety relief device is opened to exhaust gas. After completing the pressure test, the method further includes: Opening the pressure relief valve to discharge gas and reduce the pressure in the test cavity; and / or, The detection device for the safety discharge equipment for low-temperature medium further includes a drain valve, which is arranged at the bottom of the shell and communicates with the test cavity. After the pressure detector 31 detects that the pressure of the test cavity reaches a preset value, the safety relief device is opened to exhaust gas. After completing the pressure test, the method further includes: Open the drain valve to drain excess cooling medium.

[0016] The technical solution of the present invention is to remove the insulation layer of the test container so that the outer surface of the shell is exposed, thereby enhancing the heat exchange efficiency with the environment, accelerating the pressure increase rate during the natural gasification process of the low-temperature medium, and improving the test efficiency. At the same time, by rationally configuring pressure detectors and multiple temperature detectors, real-time monitoring of key parameters such as pressure, gas temperature and the temperature of the safety relief equipment body during the test is achieved, ensuring that the entire test process is controllable and measurable, so that the safety relief equipment meets the standard requirement that the pressure increase rate does not exceed 0.01MPa / s. At the same time, by providing a liquid inlet assembly consisting of a liquid storage container and a liquid inlet valve, controllable filling of the cooling medium is achieved, which is convenient for operation and ensures test repeatability. Setting the test port at the top of the test container is conducive to the installation and sealing of the safety relief equipment, reduces gas retention, and improves test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of a detection device for a safety discharge device for low-temperature media provided by the present invention.

[0019] Description of Figure Numbers: 100. Detection device for safety relief equipment for cryogenic media; 200. Safety relief equipment; 1. Test container; 11. Shell; 12. Test cavity; 13. Upper cavity; 14. Lower cavity; 2. Liquid inlet assembly; 21. Liquid storage container; 22. First liquid inlet valve; 23. Second liquid inlet valve; 24. First liquid inlet pipe; 25. Second liquid inlet pipe; 3. Detection component; 31. Pressure detector; 32. First temperature detector; 33. Second temperature detector; 4. Pressure relief valve; 5. Drain valve.

[0020] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] Safety valves and bursting discs are important safety accessories for pressure-bearing special equipment. To ensure their safety performance meets technical requirements, they must undergo type testing. For example, safety valves for cryogenic media require a low-temperature setting test using liquid nitrogen as a medium during type testing. The operating principle is as follows: During the set pressure test, the safety valve is installed on the connection plate of the test container. Liquid or other low-temperature evaporation media is continuously passed through the pipeline to allow the safety valve to fully cool. The low-temperature stop valve of the liquid storage container is then closed, followed by the stop valve on the test container connection plate. This allows the cryogenic media in the pipeline to naturally vaporize and increase in pressure. The safety valve is then observed to meet the set pressure and to determine whether it can return to its seat after opening.

[0025] It is particularly important to emphasize that the pressure increase in the test vessel is achieved through natural vaporization. Natural vaporization is achieved through heat exchange. In the figure above, we can see that the test vessel has an insulation layer. Due to the presence of the insulation layer, heat exchange is reduced, and the natural vaporization pressure increases slowly, affecting the test efficiency.

[0026] During actual operation, we discovered that removing the insulation from the test vessel increases heat exchange and accelerates the natural vaporization pressure rise. However, the safety valve type test rules, GB / T12242, "Performance Test Methods for Pressure Test Devices," in Clause 5.4.2.2, stipulate that the flow meter method for measuring flow is as follows: Increase the pressure at the inlet of the pressure relief device. After the pressure reaches 90% of the expected set pressure, the pressure increase rate should not exceed 0.01 MPa / s. Observe and record the set pressure of the pressure relief device or safety valve and other required or relevant characteristic values. Here, the set pressure test requires: After the pressure reaches 90% of the expected set pressure, the pressure increase rate should not exceed 0.01 MPa / s. This is because a slow pressure increase rate facilitates pressure testing.

[0027] In order to solve the above technical solutions, Figure 1 As shown, the present invention proposes a detection device 100 for a safety discharge device 200 for low-temperature media, comprising a test container 1, a liquid inlet assembly 2, and a detection assembly 3: the test container 1 comprises a shell 11, the inner cavity of the shell 11 is a test cavity 12, the outer surface of the shell 11 is in a bare state so as to be able to exchange heat with the environment, the shell 11 is provided with a test port and a liquid inlet connected to the test cavity 12, the test port is located at the top of the test container 1 for installing the discharge device; the liquid inlet assembly 2 comprises a liquid storage container 21 and a liquid inlet valve, the liquid storage container 21 is connected to the test cavity 12 through the liquid inlet 12 is connected to store low-temperature medium, and the liquid inlet valve is arranged at the connection between the liquid storage container 21 and the test cavity 12 to control the connection between the liquid storage container 21 and the test cavity 12; and the detection component 3 includes a pressure detector 31 and multiple temperature detectors, the pressure detector 31 is used to detect the gas pressure of the test cavity 12, and the multiple temperature detectors include at least a first temperature detector 32 and a second temperature detector, the first temperature detector 32 is used to detect the gas temperature of the test cavity 12, and the second temperature detector 33 is used to detect the temperature of the safety relief device 200.

[0028] The technical solution of the present invention is to remove the insulation layer of the test container 1 so that the outer surface of the shell 11 is exposed, thereby enhancing the heat exchange efficiency with the environment, accelerating the pressure increase rate during the natural gasification process of the low-temperature medium, and improving the test efficiency. At the same time, by rationally configuring the pressure detector 31 and multiple temperature detectors, real-time monitoring of the key parameters pressure, gas temperature and the temperature of the safety relief device 200 body during the test process is achieved, ensuring that the entire test process is controllable and measurable, so that the safety relief device 200 meets the standard requirement that the pressure increase rate does not exceed 0.01MPa / s. At the same time, by providing a liquid inlet assembly 2 consisting of a liquid storage container 21 and a liquid inlet valve, controllable filling of the cooling medium is achieved, which is convenient for operation and ensures test repeatability. Setting the test port at the top of the test container 1 is conducive to the installation and sealing of the safety relief device 200, reduces gas retention, and improves test accuracy.

[0029] It is understandable that the liquid inlet speed can be increased by providing multiple liquid inlets. In addition, alternating liquid inlet can also be performed. In one embodiment, multiple liquid inlets are provided, and the multiple liquid inlets include a first liquid inlet and a second liquid inlet. The first liquid inlet is located above the second liquid inlet, and the liquid storage container 21 is connected to the test cavity 12 through the first liquid inlet and the second liquid inlet respectively. Correspondingly, multiple liquid inlet valves are also provided, and the multiple liquid inlet valves include a first liquid inlet valve 22 and a second liquid inlet valve 23. The first liquid inlet valve 22 is provided on the pipeline between the liquid storage container 21 and the first liquid inlet, and the second liquid inlet valve 23 is provided on the pipeline between the liquid storage container 21 and the second liquid inlet. In this configuration, multiple liquid inlets (the first liquid inlet and the second liquid inlet) are provided, and the first liquid inlet is located above the second liquid inlet. The design of multiple liquid inlets allows for simultaneous or alternating introduction of cryogenic medium from different locations, increasing the number of liquid inlet channels and thus improving liquid inlet speed. When multiple liquid inlets operate simultaneously, more cryogenic medium can enter the test container 1 within the same timeframe. Compared to a single liquid inlet design, this significantly shortens the time required for liquid inlet, speeds up the initial preparation phase of the entire test, saves time for subsequent testing operations, and ultimately improves test efficiency. Placing liquid inlets at different heights can better meet the low-temperature requirements of different areas within the test container 1 and ensure a more even distribution of the cryogenic medium within the container. Liquid inlet valves (first and second liquid inlet valves 22 and 23) are provided for each liquid inlet, controlling the inlet flow from the first and second inlets, respectively. This independent valve control allows for flexible adjustment of the inlet timing and volume of liquid from each inlet, enabling an alternating inlet operation. For example, the first inlet valve 22 can be opened to allow liquid to flow from the first inlet for a period of time. Then, the first inlet valve 22 can be closed, and the second inlet valve 23 can be opened to allow liquid to flow from the second inlet, and this alternating cycle can be repeated. Liquid inlets at different heights and independently controlled inlet valves ensure a more even distribution of the cryogenic medium within the test vessel 1. The first inlet at the top delivers the cryogenic medium to the upper region of the vessel, while the second inlet at the bottom replenishes the cryogenic medium to the lower region, reducing the potential for significant local temperature variations caused by uneven liquid inflow. This ensures a more stable and uniform temperature within the test vessel 1, facilitating more accurate cooling of safety relief devices 200, such as safety valves, and resulting in more reliable test results.

[0030] In one embodiment, the liquid inlet assembly 2 further includes a liquid inlet pipe, one end of which communicates with the liquid storage container 21 and the other end of which passes through the liquid inlet port and extends to the center of the test cavity 12. The liquid inlet valve is disposed on the liquid inlet pipe and is located outside the housing 11. With this arrangement, after the liquid inlet pipe extends to the center of the test cavity 12, the cryogenic medium can diffuse from the center to the periphery of the test cavity 12 upon entering. Compared to liquid inlet only from the edges, this more effectively ensures that the medium evenly fills the entire test cavity 12, reducing temperature and concentration gradients, facilitating more uniform cooling of the safety relief device 200 placed within the test cavity 12, and thereby improving the accuracy and reliability of the test. Because the liquid inlet valve is conveniently located outside the housing 11 and, combined with the liquid inlet pipe's ability to deliver the medium to the center of the test cavity 12, the speed, flow rate, and distribution of the cryogenic medium entering the test cavity 12 can be more precisely controlled, allowing for better adjustment of the test process to meet test needs and enhancing the controllability of the entire test.

[0031] In one embodiment, the shell 11 is symmetrically arranged in the upper and lower parts so that the test cavity 12 is divided into an upper cavity 13 and a lower cavity 14, the first liquid inlet is arranged in the upper cavity 13, and the second liquid inlet is arranged in the lower cavity 14; there are multiple liquid inlet pipes, and the multiple liquid inlet pipes include at least a first liquid inlet pipe 24 and a second liquid inlet pipe 25, one end of the first liquid inlet pipe 24 is connected to the liquid storage container 21, and the other end of the first liquid inlet pipe 24 extends to the middle of the test cavity 12 and close to the top of the shell 11 through the first liquid inlet, and one end of the second liquid inlet pipe 25 is connected to the liquid storage container 21, and the other end of the second liquid inlet pipe 25 extends to the middle of the test cavity 12 and close to the bottom of the shell 11 through the second liquid inlet. This arrangement creates a vertically symmetrical structure for the housing 11, dividing the test cavity 12 into an upper cavity 13 and a lower cavity 14. The first liquid inlet is located in the upper cavity 13, and the second liquid inlet is located in the lower cavity 14. This design allows liquid to be introduced from both the upper and lower portions of the test cavity 12, providing cryogenic medium for the test from different directions. This helps to overcome the uneven distribution of cooling medium caused by the existing single liquid inlet method, allowing the cryogenic medium to spread more evenly within the test cavity 12, reducing the occurrence of localized insufficient or excessive low temperatures, and ensuring a more balanced and stable temperature environment.

[0032] In one embodiment, the detection device 100 for the cryogenic medium safety discharge device 200 further includes a pressure relief valve 4, located at the top of the housing 11 and connected to the test cavity 12. The pressure relief valve 4 is used to discharge gas. With this arrangement, when testing the safety discharge device 200, gas may be generated within the test cavity 12 due to phase changes in the cryogenic medium (e.g., liquid nitrogen) and potential chemical reactions within the device. As gas accumulates, the pressure within the test cavity 12 gradually increases. If the pressure exceeds the tolerance of the test device, it may cause an explosion or other safety hazard. The pressure relief valve 4, located at the top of the housing 11, promptly discharges this gas, preventing damage to the test device due to excessive pressure and ensuring the safety of the entire testing process. Furthermore, the presence of excessive gas may affect the pressure stability and uniformity of the medium within the test cavity 12. Gas accumulation may cause pressure fluctuations, resulting in errors in the test results of parameters such as the set pressure of the safety discharge device 200. By discharging gas in time, the pressure relief valve 4 can maintain a stable pressure in the test cavity 12, allowing the low-temperature medium to be evenly distributed, ensuring that the safety relief device 200 is tested under a stable pressure environment, thereby improving the accuracy and reliability of the test results.

[0033] In one embodiment, the detection device 100 for the cryogenic medium safety relief device 200 further includes a drain valve 5 , located at the bottom of the housing 11 and connected to the test cavity 12 . This valve is used to drain liquid. With this arrangement, after the safety relief device 200 is tested, residual cryogenic medium liquid (e.g., liquid nitrogen) may remain in the test cavity 12 . If not promptly drained, this cryogenic liquid may subsequently undergo phase changes under the influence of ambient temperature, potentially causing corrosion or damage to components within the test device. The drain valve 5 located at the bottom allows the operator to drain the liquid smoothly, facilitating cleaning and maintenance of the test device, ensuring its next normal use and extending its service life.

[0034] The present invention further proposes a method for detecting a safety discharge device 200 for a cryogenic medium, which is applicable to the detection device 100 for the above-mentioned safety discharge device 200 for a cryogenic medium, and comprises the following steps: Calculate the safe liquid intake according to the formula ; Inject the safe liquid volume into the test cavity 12 volume of cooling medium; Detecting the pressure and temperature changes of the test cavity 12 when heat exchange is performed in the environment, and the temperature changes of the safety relief device 200 when heat exchange is performed in the environment, by the detection component 3; When the pressure detector 3131 detects that the pressure of the test cavity 12 reaches a preset value, the safety relief device 200 is opened to exhaust the air, thereby completing the pressure test; Wherein, the safe liquid intake , , is the volume of the test cavity 12, For safety parameters, is the gas volume expansion coefficient of the cooling medium, is the liquid density of the cooling medium, is time and takes value 1, is the safe discharge volume, is the heating area of the shell, is the environmental condition coefficient. When the container is placed below the ground and covered with sand, F=0.3; when the container is placed on the ground, F=1.0. The latent heat of vaporization of the liquid under the release pressure. This configuration allows precise control of the volume of cooling medium injected into the test cavity 12 by calculating the safe liquid injection volume using a specific formula, taking into account factors such as the volume of the test cavity 12, safety parameters, and cooling medium characteristics. This prevents excessive pressure increases caused by excessive liquid injection, reducing safety risks such as explosions and container ruptures during the test. It also meets the required pressure increase rate. During the test, the detection component 3 monitors the pressure and temperature of the test cavity 12 and the safety relief device 200 in real time, allowing operators to promptly understand the test status. When the pressure detector 3131 detects that the pressure reaches the preset value, the safety relief device 200 activates exhaust, effectively preventing a continuous pressure increase within the test apparatus and ensuring the safety of the test process. The detection method takes into account environmental condition factors (such as different factors depending on whether the container is located underground or above ground), making the detection process more closely aligned with the actual operating environment of the safety relief device 200 and ensuring that the test results accurately reflect its performance under different operating conditions. The injection volume of the cooling medium has been precisely calculated, which can accurately simulate the pressure and temperature changes faced under different working conditions, ensuring that the test results are more in line with the actual application scenario. In addition, the gas volume expansion coefficient, liquid density, and liquid vaporization latent heat of the cooling medium are taken into account when calculating the safe liquid injection volume. Therefore, the detection method can be adjusted according to the physical properties of different cooling media, making it applicable to a variety of low-temperature cooling media, further improving the versatility of the detection method. Each step in the detection method is clear, from the calculation of the safe liquid injection volume, the injection of the cooling medium, to the monitoring of pressure and temperature, and then to the execution of the pressure test, there are clear operating instructions to facilitate the operator's execution, which can reduce unnecessary operating links and human errors, improve detection efficiency, and improve detection efficiency.

[0035] In one embodiment, the cooling medium includes liquid nitrogen, and the safe liquid intake volume . With this setting, liquid nitrogen has the characteristics of extremely low temperature, and can achieve efficient cooling as a cooling medium. In many industrial or scientific research scenarios, fast and precise cooling may be required, and liquid nitrogen can meet such needs. In addition, by introducing the characteristic parameters of liquid nitrogen, the above formula can be combined and simplified, which is conducive to fast calculation. In general, 1m 3 , 7.06m 2 , F is 1, q pressure 1.0Mpa, the latent heat of vaporization of liquid nitrogen is 160kJ / kg; calculated, 0.474m 3 .

[0036] In one embodiment, at least two pressure detectors 31 are provided, and at least two first temperature detectors 32 are provided; after the step of "detecting the pressure and temperature changes of the test cavity 12 when performing heat exchange in the environment, and the temperature changes of the safety relief device 200 when performing heat exchange in the environment through the detection component 3", the method includes: comparing the data of the two pressure detectors 31 and the two first temperature sensors; if the data are consistent, recording and continuing the test; if the data are different, stopping the test.

[0037] With this configuration, at least two pressure detectors 31 and at least two first temperature detectors 32 are provided. This ensures comprehensive and accurate acquisition of pressure and temperature data during the test. Multiple sensors can collect data from different positions and angles, minimizing the impact of single sensor failure or measurement error. The data from the two pressure detectors 31 and the two first temperature sensors are compared. This comparison method effectively identifies data consistency and discrepancies, providing a basis for further assessing the stability and reliability of the test. Data comparison ensures the accuracy and reliability of the collected pressure and temperature data. Continuing the test when the data are consistent ensures test continuity and stability. Promptly terminating the test when discrepancies occur prevents erroneous data from interfering with the results and drawing erroneous test conclusions, thereby improving the overall reliability of the test. For example, if one of the pressure detectors 31 fails and generates abnormal data, comparison with the data from the other sensors can promptly identify the problem and prevent the erroneous pressure data from affecting the determination of parameters such as the set pressure of the safety relief device 200. Furthermore, terminating the test promptly when discrepancies occur can promptly identify equipment malfunctions or failures to open properly due to inaccurate pressure testing.

[0038] In one embodiment, the liquid inlet is provided with a plurality of liquid inlets, the plurality of liquid inlets including a first liquid inlet and a second liquid inlet, the first liquid inlet is located above the second liquid inlet, and the liquid storage container 21 is connected to the test cavity 12 through the first liquid inlet and the second liquid inlet respectively; correspondingly, the liquid inlet valve is also provided with a plurality of liquid inlet valves, the plurality of liquid inlet valves including a first liquid inlet valve 22 and a second liquid inlet valve 23, the first liquid inlet valve 22 is provided between the liquid storage container 21 and the first liquid inlet, and the second liquid inlet valve 23 is provided between the liquid storage container 21 and the second liquid inlet; The step of injecting the cooling medium into the test cavity 12 according to the liquid inflow volume from the liquid storage container 21 specifically includes: The first liquid inlet valve 22 and the second liquid inlet valve 23 are opened alternately to allow the cooling medium to be injected from the liquid storage container 21 into the test cavity 12. In this way, the liquid inlets set at different heights combined with the alternating liquid inlet mode can make the low-temperature medium more evenly distributed in the test container 1. The first liquid inlet at the top sends the cooling medium to the upper area of the container, and the second liquid inlet at the bottom replenishes the cooling medium to the lower area of the container, reducing the problem of excessive local temperature differences caused by uneven liquid inlet. Making the temperature in the test container 1 more stable and uniform is conducive to more accurate cooling of safety relief equipment 200 such as safety valves, thereby ensuring the reliability of the test results. For example, when conducting a low-temperature setting test on a safety valve, a uniform low-temperature environment can achieve consistent cooling effects on various parts of the safety valve, and more accurately test its set pressure and other parameters.

[0039] In one embodiment, the detection device 100 of the safety relief device 200 for low-temperature medium further includes a pressure relief valve 4, which is disposed at the top of the housing 11 and communicates with the test cavity 12. After the pressure of the test cavity 12 reaches a preset value as detected by the pressure detector 31, the safety relief device 200 is opened to exhaust gas. After completing the pressure test, the step further includes: opening the pressure relief valve 4 to exhaust gas and reduce the pressure of the test cavity 12. This arrangement makes opening the pressure relief valve 4 a necessary step after the pressure test, making the entire test process more complete and reasonable. Not only does it complete the key link of the pressure test, but it can also adjust and stabilize the pressure in the test cavity 12 in a timely manner, providing good test conditions for subsequent repeated tests or other related operations, ensuring that the test can be carried out continuously and efficiently.

[0040] In one embodiment, the detection device 100 of the safety relief device 200 for low-temperature medium further includes a drain valve 5, which is arranged at the bottom of the shell 11 and is connected to the test cavity 12. After the pressure of the test cavity 12 reaches a preset value detected by the pressure detector 31, the safety relief device 200 is opened to exhaust gas. After completing the pressure test, the step further includes: opening the drain valve 5 to discharge excess cooling medium. With this arrangement, discharging excess cooling medium can avoid interference with the next test caused by residual liquid. Residual liquid will change the initial conditions such as temperature and pressure in the test cavity 12, affecting the accurate measurement of the performance parameters of the safety relief device 200 in subsequent tests. By draining away excess liquid, each test can be carried out in a relatively stable and standard environment, ensuring the accuracy and comparability of the test results.

[0041] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A detection device for a safety discharge device for a low-temperature medium, characterized in that: include: The test container comprises a shell, the inner cavity of the shell being a test cavity, the outer surface of the shell being exposed to enable heat exchange with the surrounding environment, and a test port and a liquid inlet being provided on the shell, the test port being located at the top of the test container for installation of a discharge device; A liquid inlet assembly, comprising a liquid storage container and a liquid inlet valve, wherein the liquid storage container is connected to the test cavity through the liquid inlet for storing a low-temperature medium, and the liquid inlet valve is provided at the connection between the liquid storage container and the test cavity for controlling the connection between the liquid storage container and the test cavity; as well as, The detection component includes a pressure detector and multiple temperature detectors, wherein the pressure detector is used to detect the gas pressure of the test cavity, and the multiple temperature detectors include at least a first temperature detector and a second temperature detector, wherein the first temperature detector is used to detect the gas temperature of the test cavity, and the second temperature detector is used to detect the temperature of the safety relief device.

2. The detection device for a safety discharge device for a low-temperature medium according to claim 1, characterized in that: The liquid inlet is provided with a plurality of liquid inlets, the plurality of liquid inlets including a first liquid inlet and a second liquid inlet, the first liquid inlet is located above the second liquid inlet, and the liquid storage container is connected to the test cavity through the first liquid inlet and the second liquid inlet respectively; Correspondingly, there are multiple liquid inlet valves, including a first liquid inlet valve and a second liquid inlet valve. The first liquid inlet valve is arranged on the pipeline between the liquid storage container and the first liquid inlet, and the second liquid inlet valve is arranged on the pipeline between the liquid storage container and the second liquid inlet.

3. The detection device for a safety discharge device for a low-temperature medium according to claim 1 or 2, characterized in that: The liquid inlet assembly further includes a liquid inlet pipe, one end of which is in communication with the liquid storage container, and the other end of which passes through the liquid inlet and extends to the middle of the test cavity; The liquid inlet valve is arranged on the liquid inlet pipe and is located outside the shell.

4. The detection device for a safety discharge device for a low-temperature medium according to claim 3, characterized in that: The housing is symmetrically arranged in an upper and lower manner, so that the test cavity is divided into an upper cavity and a lower cavity, the first liquid inlet is arranged in the upper cavity, and the second liquid inlet is arranged in the lower cavity; There are multiple liquid inlet pipes, and the multiple liquid inlet pipes include at least a first liquid inlet pipe and a second liquid inlet pipe. One end of the first liquid inlet pipe is connected to the liquid storage container, and the other end of the first liquid inlet pipe extends to the middle of the test cavity and close to the top of the shell through the first liquid inlet port. One end of the second liquid inlet pipe is connected to the liquid storage container, and the other end of the second liquid inlet pipe extends to the middle of the test cavity and close to the bottom of the shell through the second liquid inlet port.

5. The detection device for a safety discharge device for a low-temperature medium according to claim 1, characterized in that: The detection device for the safety discharge equipment for low-temperature medium further includes a pressure relief valve, which is arranged on the top of the shell and communicates with the test cavity, and is used to discharge gas; and / or, The detection device of the safety discharge equipment for low-temperature medium further includes a drain valve, which is arranged at the bottom of the shell and communicates with the test cavity, and is used to discharge liquid.

6. A method for detecting a safety discharge device for a cryogenic medium, applicable to the detection device for a safety discharge device for a cryogenic medium according to any one of claims 1 to 5, characterized in that: The following steps are involved: Calculate the safe liquid intake according to the formula ; Inject the safe amount of liquid into the test cavity volume of cooling medium; Detecting, by the detection component, changes in pressure and temperature of the test cavity when heat exchange is performed in the environment in which it is located, and changes in temperature of the safety relief device when heat exchange is performed in the environment in which it is located; When the pressure detector 31 detects that the pressure of the test cavity reaches a preset value, the safety relief device is opened to exhaust the air, thereby completing the pressure test; Wherein, the safe liquid intake , , is the volume of the test cavity, For safety parameters, is the gas volume expansion coefficient of the cooling medium, is the liquid density of the cooling medium, is time and takes value 1, is the safe discharge volume, is the heating area of the shell, is the environmental condition coefficient. When the container is placed below the ground and covered with sand, F=0.3; when the container is placed on the ground, F=1.

0. is the latent heat of vaporization of the liquid at the relief pressure.

7. The method for detecting a safety discharge device for low-temperature media according to claim 6, wherein: The cooling medium includes liquid nitrogen, and the safe liquid intake .

8. The method for detecting a safety discharge device for low-temperature media according to claim 6, wherein: There are at least two pressure detectors 31, and at least two first temperature detectors; After the step of "detecting, by the detection component, the pressure and temperature changes of the test cavity when heat exchange is performed in the environment in which it is located, and the temperature changes of the safety relief device when heat exchange is performed in the environment in which it is located", the following steps are included: Comparing data from the two pressure detectors 31 and the two first temperature sensors; If the data are consistent, record them and continue the test; If the data differ, the experiment is stopped.

9. The method for detecting a safety discharge device for low-temperature media according to claim 6, wherein: The liquid inlet is provided with a plurality of liquid inlets, the plurality of liquid inlets including a first liquid inlet and a second liquid inlet, the first liquid inlet is located above the second liquid inlet, and the liquid storage container is connected to the test cavity through the first liquid inlet and the second liquid inlet respectively; Correspondingly, the liquid inlet valve is also provided in plurality, and the plurality of liquid inlet valves include a first liquid inlet valve and a second liquid inlet valve, the first liquid inlet valve is provided between the liquid storage container and the first liquid inlet, and the second liquid inlet valve is provided between the liquid storage container and the second liquid inlet; The step of injecting the cooling medium into the test cavity according to the liquid inflow volume from the liquid storage container specifically includes: The first liquid inlet valve and the second liquid inlet valve are opened alternately to allow the cooling medium to be injected from the liquid storage container into the test cavity.

10. The method for detecting a safety discharge device for low-temperature media according to claim 6, wherein: The detection device of the safety discharge equipment for low-temperature medium further includes a pressure relief valve, which is arranged on the top of the shell and communicates with the test cavity. After the pressure detector 31 detects that the pressure of the test cavity reaches a preset value, the safety relief device is opened to exhaust gas. After completing the pressure test, the method further includes: Opening the pressure relief valve to discharge gas and reduce the pressure in the test cavity; and / or, The detection device for the safety discharge equipment for low-temperature medium further includes a drain valve, which is arranged at the bottom of the shell and communicates with the test cavity. After the pressure detector 31 detects that the pressure of the test cavity reaches a preset value, the safety relief device is opened to exhaust gas. After completing the pressure test, the method further includes: Open the drain valve to drain excess cooling medium.

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