Experimental device and method for evaluating compatibility of metal container and gas extinguishing agent

Abstract

The invention discloses an experimental device and method for evaluating the compatibility of a metal container and a gaseous extinguishing agent. The experimental device comprises an air inlet valve, a T-shaped tee joint, a first air entraining pipe, an experimental pipe, a plug and a pressure gauge. An air outlet pipe of the air inlet valve, two branch pipes of the T-shaped tee joint, the first air guide pipe and the experiment pipe are coaxially screwed in sequence from top to bottom; the plug is screwed at the lower end of the experiment tube to seal the lower-end tube opening; and the pressure gauge is screwed on the main pipe of the T-shaped tee joint. According to the invention, the compatibility experiment of the metal container of the fire extinguishing agent system and the fire extinguishing agent can be repeated, the actual application working condition of the fire extinguishing agent system can be accurately repeated, and systematic quantitative analysis of an experimental sample can be realized; by paying attention to the filling pressure and storage condition elements in the practical application of the fire extinguishing system, a bridge between a sample experiment and an engineering experiment in the fire extinguishing agent compatibility experiment is cut through, the practical application working condition of the fire extinguishing system can be fully considered, and complete quantitative analysis can be carried out on an experiment sample.

Description

Technical Field

[0001] The present invention relates to the technical field of fire extinguishing agents, and more particularly to an experimental device and method for evaluating the compatibility of a metal container with a gas fire extinguishing agent. Background Art

[0002] The material selection for new gas fire extinguishing systems directly impacts their safety and reliability. To meet requirements for easy degradation and environmental friendliness, new gas extinguishing agents typically contain unsaturated bonds or cyclic structures, resulting in increased reactivity and increased corrosion to the metal materials commonly used in gas fire extinguishing systems. During use, gas extinguishing agents come into contact with key components such as storage containers, valves, and siphons. Corrosion, damage, or failure of these materials during storage and use can easily lead to serious accidents. Severe corrosion in the storage components of a fire extinguishing system can negatively impact the quality of the extinguishing agent and the system's firefighting capabilities. Corrosion in valves can easily render them inoperable, potentially disrupting the system's operation. In actual use, there have been cases of extinguishing agent tanks corroding and fracturing at the liquid level, even exploding, leading to leaks and accidents. Therefore, selecting metal materials that are stable and compatible with these new gas extinguishing agents under long-term pressure is crucial for ensuring the long-term, safe, and reliable service of these new gas fire extinguishing systems.

[0003] In the field of fire extinguishing system material compatibility research, scientific research institutions have conducted sample experiments on the compatibility of new gas fire extinguishing agents such as perfluorohexanone and 2-BTP with metal materials such as aviation aluminum alloys, providing an important reference for material selection. However, existing research is mostly limited to experimental sample conditions, and fails to fully simulate the superimposed effects of actual working conditions such as system filling pressure and storage environment on material corrosion and aging, which is significantly different from the complex working conditions of long-term pressurized operation of fire extinguishing systems. At the engineering application level, current research mostly remains at the phenomenon observation stage, with relatively extensive methods, mainly based on qualitative analysis, and lacks quantitative data support, resulting in overly conservative material selection or insufficient reliability demonstration, and has not achieved a systematic connection between laboratory sample experiments and engineering applications.

[0004] Therefore, how to provide a compatibility test device for pressurized metal containers that is both operational and capable of carrying different filling pressures and replicating different storage conditions, and accurately simulating the actual application conditions of the fire extinguishing system in a laboratory environment, is an urgent problem that technical personnel in this field need to solve. Summary of the Invention

[0005] In view of this, the present invention provides an experimental device and method for evaluating the compatibility of metal containers and gas fire extinguishing agents. Taking the filling pressure, filling density, storage conditions, contact time, etc. of the fire extinguishing system as key factors, the device replicates the compatibility experiment between the metal container and the fire extinguishing agent of the fire extinguishing agent system, accurately replicates the actual application conditions of the fire extinguishing agent system, and realizes systematic quantitative analysis of experimental samples.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An experimental device for evaluating the compatibility of metal containers with gaseous fire extinguishing agents, including an air inlet valve, a T-joint, a first air bleed pipe, a test pipe, a plug, and a pressure gauge;

[0008] The outlet pipe of the air inlet valve, the two branch pipes of the T-shaped tee, the first air bleed pipe, and the experimental pipe are coaxially screwed in sequence from top to bottom; the plug is screwed on the lower end of the experimental pipe to close its lower end pipe opening; the pressure gauge is screwed on the main pipe of the T-shaped tee.

[0009] The beneficial effect of the technical solution of the present invention is that the test tube and the plug are bolted together to simulate a container containing a gas fire extinguishing agent. The tube and the pressure gauge are connected through a T-shaped three-way connection, and the test gas is injected into the test tube using an air inlet valve. The pressure gauge feeds back the pressure value. The structure is simple and the cost is low.

[0010] Preferably, the plug includes a plug tube and a plug locking nut. The plug tube is open at the top and closed at the bottom. The plug tube has an internal thread on its inner wall opposite the open end. The outer wall of the lower end of the experimental tube has an external thread that can be screwed into the internal thread. The plug locking nut screws into the outer wall of the plug tube to lock the plug to the experimental tube. The plug is threadedly connected to the lower end of the experimental tube, making it easy to install and remove.

[0011] Preferably, the plugging sleeve is further included, and the plugging sleeve is embedded between the inner wall of the plugging tube and the outer wall of the lower end of the experimental tube to form a conical sealing structure. The plugging sleeve can improve the sealing performance between the experimental tube and the plugging sleeve.

[0012] Preferably, a reducing straight-through is also included, comprising a reducing tube, a fastening nut, and a sealing ferrule; the diameter of the experimental tube is larger than that of the first air bleed tube; the large end of the reducing tube is threadedly connected to the upper end of the experimental tube; the small end is threadedly connected to the lower end of the first air bleed tube; and the sealing ferrule is embedded between the outer wall of the upper end of the experimental tube and the inner wall of the large end of the reducing tube. The reducing straight-through is used to connect experimental tubes of different diameters to the first air bleed tube, and the detachable structure allows for replacement of experimental tubes of different materials for comparative experiments.

[0013] Preferably, both ends of the first air duct are threadedly connected to a first straight pipe; the upper first straight pipe is threadedly connected to the branch pipe below the T-shaped tee; the lower first straight pipe is threadedly connected to the small end of the reducer. The first straight pipe connects the first air duct to the reducer and the first air duct to the T-shaped tee, making installation and removal easy.

[0014] Preferably, a first locking nut is screwed onto the outer wall of the first straight tube; a first straight ferrule is embedded in each end of the first straight tube; and multiple first straight ferrules are respectively fitted onto the outer walls of both ends of the first air duct and onto the branch pipe below the T-junction. The first locking nut and the first straight ferrule can improve the sealing performance between the first air duct and the reducing straight tube and the T-junction.

[0015] Preferably, the device further includes a second air bleed pipe and a second straight-through pipe; two second straight-through pipes are screwed to the upper and lower ends of the second air bleed pipe, respectively; the lower second straight-through pipe is screwed to the branch pipe above the T-shaped tee; and the upper second straight-through pipe is screwed to the outlet pipe of the air inlet valve. Providing the second air bleed pipe between the air inlet valve and the T-shaped tee improves the overall stability of the device.

[0016] Preferably, a second locking nut is screwed onto the outer wall of the second straight-through pipe, and second straight-through ferrules are embedded in the inner walls of both the upper and lower ends of the second straight-through pipe. Multiple second straight-through ferrules are respectively fitted onto the outer walls of the branch pipe above the T-shaped tee, the ends of the second air bleed pipe, and the outlet pipe of the intake valve. The second locking nut and second straight-through ferrules can improve the sealing performance between the second bleed pipe, the intake valve, and the T-shaped tee.

[0017] Preferably, the air inlet valve is a needle valve, with an air outlet pipe fixed at its lower end and an air inlet pipe fixed at its upper end; a handle is rotatably connected to the side wall of the air inlet valve to control the opening and closing of the air inlet valve.

[0018] The present invention also provides an experimental method for evaluating the compatibility of metal containers with gas fire extinguishing agents. The compatibility experiment is conducted using the experimental device in the above technical solution, comprising the following steps:

[0019] S1. Open the air inlet valve and inject the experimental fire extinguishing agent into the experimental tube through the air inlet valve;

[0020] S2, inject nitrogen into the experimental tube through the inlet valve;

[0021] S3, transfer the experimental device to the temperature test box;

[0022] S4. Conduct compatibility experiments according to the set duration;

[0023] S5. After the experiment, the gas and liquid in the experimental tube are sampled separately; the experimental tube is sampled for morphology observation and mechanical property testing.

[0024] The beneficial effect of the above technical solution is that it replicates the compatibility experiment between the metal container of the fire extinguishing agent system and the fire extinguishing agent with the filling pressure, filling density, storage conditions, contact time, etc. of the fire extinguishing system as key factors, accurately replicates the actual application conditions of the fire extinguishing agent system, and realizes systematic quantitative analysis of experimental samples.

[0025] As can be seen from the above technical solution, compared with the prior art, the present invention provides an experimental device and method for evaluating the compatibility of metal containers with gas fire extinguishing agents, which has the following beneficial effects:

[0026] 1) By focusing on the filling pressure and storage conditions in the actual application of the fire extinguishing system, the present invention simplifies the large-scale fire extinguishing system into an experimental device suitable for laboratory batch experiments. It also bridges the gap between sample experiments and engineering experiments in the fire extinguishing agent compatibility experiment, and can fully consider the actual application conditions of the fire extinguishing system and conduct a complete quantitative analysis of the experimental samples.

[0027] 2) The present invention uses metal test tubes as the main body, and the test object can be investigated by replacing metal test tubes of different materials, which expands the material selection range of compatibility experiments and can greatly reduce the cost of compatibility experiments.

[0028] 3) The present invention is flexible and easy to use and operate, which can reduce the burden on experimenters and improve the operability of the experiment. A large number of experimental devices can be placed in the same box to carry out experiments simultaneously, which can realize large-scale compatibility experiments in a laboratory environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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 merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of the experimental device structure provided by the present invention;

[0031] Figure 2 Schematic diagram of the experimental device provided by the present invention;

[0032] Figure 3 A cross-sectional view of the experimental device provided by the present invention.

[0033] in,

[0034] 1-Experimental tube; 2-Plug; 21-Plug tube; 22-Locking nut; 23-Plug ferrule; 3-Reducing straight-through; 31-Reducing tube; 32-Fastening nut; 33-Sealing ferrule; 4-First air bleed pipe; 5-First straight-through pipe; 51-First straight-through ferrule; 6-T-type tee; 7-Pressure gauge; 8-Second air bleed pipe; 9-Second straight-through pipe; 91-Second straight-through ferrule; 10-Inlet valve; 101-Handle; 102-Inlet pipe. DETAILED DESCRIPTION

[0035] 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 creative efforts are within the scope of protection of the present invention.

[0036] Example 1:

[0037] See attached Figures 1 to 3 The embodiment of the present invention discloses an experimental device for evaluating the compatibility of a metal container with a gas fire extinguishing agent, comprising an air inlet valve 10, a T-shaped three-way connection 6, a first air bleed pipe 4, an experimental pipe 1, a plug 2 and a pressure gauge 7;

[0038] The outlet pipe of the air inlet valve 10, the two branch pipes of the T-shaped tee 6, the first air bleed pipe 4, and the experimental pipe 1 are coaxially screwed in sequence from top to bottom; the plug 2 is screwed on the lower end of the experimental pipe 1 to close its lower end pipe opening; the pressure gauge 7 is screwed on the main pipe of the T-shaped tee 6.

[0039] In this embodiment, the test tube is a metal tube body, which is connected to the lower end of the first air duct in a detachable manner. The lower end of the test tube is sealed by a plug, and the experimental gas is injected into the test tube using the air inlet valve. After setting the experimental conditions, the compatibility test can be carried out. The structure is simple and reliable.

[0040] In order to further optimize the above technical solution, the plug 2 includes a plug tube 21 and a plug locking nut 22. The upper end of the plug tube 21 is open and the lower end is closed. The plug tube 21 is provided with an internal thread on the inner wall relative to its open end; the outer wall of the lower end of the experimental tube 1 is provided with an external thread that can be screwed together with the internal thread; the plug locking nut 22 is screwed onto the outer wall of the plug tube 21 to lock the plug 2 to the experimental tube 1.

[0041] Referring to the accompanying drawings, the threads in the drawings in this embodiment are not shown. For those skilled in the art, the arrangement of the threads can be known based on the content of this embodiment.

[0042] like Figure 2The lower end of the plug tube closes the upper end opening, the inner wall of the upper end opening is provided with an internal thread, and the lower end of the test tube is provided with an external thread. Using the plug to seal the test tube can prevent leakage of the medium in the test tube.

[0043] In order to further optimize the above technical solution, a plug ferrule 23 is also included. The plug ferrule 23 is embedded between the inner wall of the plug tube 21 and the outer wall of the lower end of the experimental tube 1 to form a conical sealing structure.

[0044] A conical sealing structure is formed between the experimental tube and the plug tube through the plug ferrule. As the plug locking nut is tightened more deeply, the plug tube will be pressed against the plug ferrule. In this state, the plug ferrule gradually shrinks, and the plug ferrule achieves the sealing effect between the test tube and the plug tube by plastic deformation sealing. The plug ferrule adopts the form of a double ferrule, which effectively ensures the conical sealing effect between the experimental tube and the plug tube.

[0045] In other specific embodiments, a reducing straight-through 3 is further included, which includes a reducing tube 31, a fastening nut 32 and a sealing sleeve 33; the diameter of the experimental tube 1 is larger than the diameter of the first air duct 4; the large end of the reducing tube 31 is screwed to the upper end of the experimental tube 1; the small end is screwed to the lower end of the first air duct 4; the sealing sleeve 33 is embedded between the outer wall of the upper end of the experimental tube 1 and the inner wall of the large end of the reducing tube 31.

[0046] The diameter of the experimental tube needs to replicate the fire extinguishing agent container, and its diameter is generally larger than the first air bleed pipe. Therefore, the first air bleed pipe and the experimental tube are connected through a reducer. The inner wall of the reducer is provided with an internal thread, and the upper end of the experimental tube is provided with an external thread, and the connection between the experimental tube and the reducer is achieved by threaded connection. A sealing sleeve is embedded between the inner wall of the large end of the reducer and the outer wall of the upper end of the experimental tube. By screwing on the fastening nut on the outside of the reducer, as the screwing depth of the fastening nut increases, the reducer will be pressed against the sealing sleeve, and the sealing sleeve ensures the conical surface sealing effect between the experimental tube and the reducer in a plastic sealing manner.

[0047] In order to further optimize the above technical solution, both ends of the first air duct 4 are screwed with the first straight pipe 5; the first straight pipe 5 located at the top is screwed with the branch pipe below the T-shaped tee 6; the first straight pipe 5 located at the bottom is screwed with the small head end of the reducer 31.

[0048] The first straight pipe serves as a transition connection joint, realizing the connection between the first air duct and the reducing straight pipe and T-shaped tee. The small end of the first straight pipe and the reducing straight pipe can be welded and fixed, can be prepared as a whole, or can be connected by means of internal and external thread engagement. The specific connection method is not limited here.

[0049] In order to further optimize the above technical solution, a first locking nut is screwed onto the outer wall of the first straight pipe 5; a first straight ferrule 51 is embedded at both ends of the first straight pipe 5; and multiple first straight ferrules 51 are respectively mounted on the outer walls at both ends of the first air duct 4 and the branch pipes below the T-shaped tee 6.

[0050] By tightening the first locking nut, the first straight ferrule is compressed and shrunk, so that the first straight ferrule ensures the conical surface sealing effect between the first air duct and the reducing straight ferrule and the T-shaped tee in a plastic deformation manner.

[0051] In other specific embodiments, it also includes a second air duct 8 and a second straight-through pipe 9; there are two second straight-through pipes 9 and they are respectively screwed to the upper and lower ends of the second air duct 8; the second straight-through pipe 9 located at the bottom is screwed to the branch pipe above the T-shaped tee 6; the second straight-through pipe 9 located at the top is screwed to the outlet pipe of the intake valve 10.

[0052] If the intake valve and the T-shaped tee are connected, the connection is complicated and the sealing effect cannot be guaranteed. Therefore, the second air bleed pipe is used as a transition pipe to connect the intake valve and the T-shaped tee; the second air bleed pipe uses a second straight pipe as a connecting joint, and the connection method is simple and reliable.

[0053] In order to further optimize the above technical solution, a second locking nut is screwed onto the outer wall of the second straight-through pipe 9, and a second straight-through ferrule 91 is embedded in the inner wall of the upper end and the inner wall of the lower end of the second straight-through pipe 9; multiple second straight-through ferrules 91 are respectively mounted on the branch pipe above the T-shaped tee 6, the two ends of the second air duct 8 and the outer wall of the outlet pipe of the air intake valve 10.

[0054] As the second locking nut is screwed deeper, the second straight-through tube will press the second straight-through ferrule to cause it to shrink and deform. The second straight-through ferrule achieves a conical surface sealing effect between the second tube and the intake valve and T-type tee by plastic deformation.

[0055] In some other specific embodiments, the air intake valve 10 is a needle valve, with an air outlet pipe fixed at its lower end and an air intake pipe 102 fixed at its upper end; a handle 101 is rotatably connected to the side wall of the air intake valve 10 to control the opening and closing of the air intake valve 10.

[0056] Example 2:

[0057] The present invention discloses an experimental method for evaluating the compatibility of metal containers with gas fire extinguishing agents. The compatibility test is performed using the experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents in Example 1, and includes the following steps:

[0058] S0. Experimental preparation: Before the experiment, connect all components in order, and perform leak detection and vacuuming on the experimental device;

[0059] S1. Filling the fire extinguishing agent: After completing the experimental preparations, connect the air pipe connected to the experimental fire extinguishing agent to the air inlet pipe of the air inlet valve, rotate the handle to open the air inlet valve, and under the condition of negative pressure inside the device, inject the experimental test fire extinguishing agent into the experimental tube through the air inlet valve;

[0060] S2, nitrogen filling: inject nitrogen into the experimental tube through the air inlet valve;

[0061] After the experimental fire extinguishing agent is injected, rotate the handle to close the air inlet valve, remove the air pipe connected to the fire extinguishing agent, and connect it to the nitrogen cylinder through the pipeline;

[0062] Open the main valve on the nitrogen cylinder and slowly adjust the handle of the pressure reducing valve connected to the nitrogen cylinder to gradually increase the air pressure in the tube. When the pressure gauge at the outlet of the pressure reducing valve reaches the experimental level, slowly turn the handle to open the air inlet valve. Nitrogen will flow into the experimental tube along the pipeline, air inlet valve, second air inlet pipe, T-joint, and first air inlet pipe.

[0063] Observe the pressure indicator on the experimental device. When the indicator reaches the required value, quickly rotate the handle to close the air inlet valve. The pressure element required by the experiment is adjusted.

[0064] Close the main valve on the nitrogen cylinder and rotate the handle of the pressure reducing valve connected to the nitrogen cylinder to stop nitrogen transmission;

[0065] It should be noted that this step can be omitted when simulating self-pressurized and externally stored pressure fire extinguishing systems.

[0066] S3, storage adjustment settings; transfer the experimental device to the temperature test box;

[0067] According to the experimental needs, the experimental device is transferred to a temperature experimental box with a constant or alternating temperature environment, and the temperature elements required by the experiment are adjusted;

[0068] S4. Enter the experimental cycle; conduct compatibility experiments according to the set duration;

[0069] S5. Sampling and testing: After the experiment, the gas and liquid in the experimental tube are sampled separately; the experimental tube is sampled for morphological observation and mechanical property testing;

[0070] After the compatibility experiment is over, transfer the experimental device to room temperature and let it stand for a while. Then connect the gas sampling bag and slowly turn the handle to open the air inlet valve. The gas in the experimental device will completely enter the gas sampling bag and the experimental gas product will be collected.

[0071] The experimental device is tilted or turned upside down, and the liquid in the experimental tube flows out along the first air duct and the second air duct, and the experimental liquid product is collected;

[0072] The experimental tube was removed and cut into long strips of specimens for systematic analysis including morphology observation and mechanical property testing.

[0073] Example 3:

[0074] The present embodiment provides an experimental method for evaluating the compatibility of metal containers with gas fire extinguishing agents. A comparative experiment was conducted according to the steps in Example 2, including:

[0075] Experiment 1: Conduct a compatibility test of 304 stainless steel with perfluorohexanone fire extinguishing agent under pressurized conditions:

[0076] (1) The specifications of the materials used in the experiment are as follows:

[0077] The experimental tube was made of 304 stainless steel tube with an outer diameter of 25.4 mm, a wall thickness of 3 mm, and a length of 100 mm;

[0078] The experimental fire extinguishing agent is perfluorohexanone, with a water content of <10ppm

[0079] (2) Experimental elements setting:

[0080] Storage conditions: 25°C

[0081] Filling pressure: 1.0Mpa

[0082] Contact duration: 30 days

[0083] (3) Compatibility index measurement:

[0084] Corrosion area and corrosion depth;

[0085] Experiment 2: Carry out compatibility test of carbon steel with perfluorohexanone fire extinguishing agent under pressurized conditions:

[0086] (1) Specifications of materials used in the experiment:

[0087] The experimental tube is a carbon steel tube with the same size as in Example 1;

[0088] The experimental fire extinguishing agent is perfluorohexanone, with a water content of <10ppm

[0089] (2) Experimental elements setting: same as Example 1.

[0090] (3) Compatibility index measurement: the same as in Example 1;

[0091] The 304 stainless steel pipe in Example 1 was replaced with a carbon steel pipe, and the other elements were set the same.

[0092] Experiment 3: Conduct a compatibility test of 304 stainless steel with perfluorohexanone fire extinguishing agent under pressurized conditions:

[0093] The filling pressure in Example 1 was adjusted to 2.0 MPa, and the other elements were set the same.

[0094] Experiment 4: Conduct a compatibility test of 304 stainless steel with perfluorohexanone fire extinguishing agent under pressurized conditions:

[0095] The contact time in Example 1 was adjusted to 60 days, and the other elements were set to be the same.

[0096] Experiment 5:

[0097] Carry out compatibility test of 304 stainless steel with perfluorohexanone fire extinguishing agent under pressurized conditions:

[0098] The storage conditions in Example 1 were adjusted to 75° C., and other elements were set the same.

[0099] After the compatibility test cycle was completed, the metal pipes in each embodiment were taken out and cut into long strips of samples. The corrosion area and corrosion depth were measured. The results are shown in the following table:

[0100] Table 1 Corrosion area and depth results

[0101] Example Corrosion area% Corrosion depth (nm) 1 11.905 -75.6 2 12.137 -88.4 3 19.737 -110.8 4 16.089 -137.3 5 15.489 -89.8

[0102] In terms of metal container types, the comparison between Experiments 1 and 2 shows that 304 stainless steel exhibits better corrosion resistance than carbon steel in terms of both corrosion area and corrosion depth.

[0103] In terms of filling pressure, the comparison between Experiments 1 and 3 shows that with the increase of filling pressure, the corrosion area and corrosion depth of the material surface increase significantly;

[0104] In terms of contact time, the comparison between Experiments 1 and 4 shows that the increase in contact time will amplify the impact of corrosion to a certain extent, but the degree of impact is slightly smaller than the corrosion-intensifying effect caused by the increase in filling pressure;

[0105] In terms of storage conditions, the comparison between Experiments 1 and 5 shows that the increase in temperature promotes corrosion, and its impact exceeds the corrosion effect caused by the prolonged contact time.

[0106] The calculation results in the table above indicate that the experimental apparatus and method for evaluating the compatibility of metal containers with novel gas fire extinguishing agents provided by the present invention can simulate the stress and service state of internal metal materials during the actual application of novel gas fire extinguishing systems. Furthermore, based on the control variable method, key application factors such as the type of metal material, filling pressure, contact time, and storage conditions are changed to clarify the influence of core application factors on the "agent-material" compatibility, thereby achieving the goals of material selection and system optimization.

[0107] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0108] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents, characterized in that: It comprises an air inlet valve (10), a T-shaped three-way valve (6), a first air inlet pipe (4), a test pipe (1), a plug (2) and a pressure gauge (7); The air outlet pipe of the air inlet valve (10), the two branch pipes of the T-shaped three-way pipe (6), the first air inlet pipe (4), and the experimental pipe (1) are coaxially screwed in sequence from top to bottom; the plug (2) is screwed on the lower end of the experimental pipe (1) to close the lower end pipe opening; and the pressure gauge (7) is screwed on the main pipe of the T-shaped three-way pipe (6).

2. The experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents according to claim 1, characterized in that: The plug (2) comprises a plug tube (21) and a plug locking nut (22); the plug tube (21) is open at the upper end and closed at the lower end; the plug tube (21) is provided with an internal thread on the inner wall relative to the open end; the outer wall of the lower end of the test tube (1) is provided with an external thread that can be screwed together with the internal thread; the plug locking nut (22) is screwed together with the outer wall of the plug tube (21) to lock the plug (2) and the test tube (1).

3. The experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents according to claim 2, characterized in that: It also includes a plug ferrule (23), which is embedded between the inner wall of the plug tube (21) and the outer wall of the lower end of the experimental tube (1) to form a conical surface sealing structure.

4. The experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents according to claim 1, characterized in that: The invention also includes a reducing straight-through (3), which includes a reducing pipe (31), a fastening nut (32) and a sealing sleeve (33); the diameter of the experimental tube (1) is larger than the diameter of the first air duct (4); the large end of the reducing pipe (31) is screwed to the upper end of the experimental tube (1); the small end is screwed to the lower end of the first air duct (4); and the sealing sleeve (33) is embedded between the outer wall of the upper end of the experimental tube (1) and the inner wall of the large end of the reducing pipe (31).

5. The experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents according to claim 4, characterized in that: Both ends of the first air duct (4) are screwed with a first straight pipe (5); the first straight pipe (5) located at the top is screwed with the branch pipe below the T-shaped tee (6); and the first straight pipe (5) located at the bottom is screwed with the small end of the reducer (31).

6. The experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents according to claim 5, characterized in that: A first locking nut is screwed onto the outer wall of the first straight-through pipe (5); first straight-through ferrules (51) are respectively embedded at both ends of the first straight-through pipe (5); and a plurality of first straight-through ferrules (51) are respectively sleeved on the outer walls of both ends of the first air duct (4) and the branch pipe below the T-shaped tee (6).

7. The experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents according to claim 5, characterized in that: It also includes a second air bleed pipe (8) and a second straight pipe (9); the second straight pipe (9) is two in number and is respectively screwed to the upper and lower ends of the second air bleed pipe (8); the second straight pipe (9) located at the bottom is screwed to the branch pipe above the T-shaped tee (6); the second straight pipe (9) located at the top is screwed to the outlet pipe of the air inlet valve (10).

8. The experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents according to claim 7, characterized in that: A second locking nut is screwed onto the outer wall of the second straight-through pipe (9), and a second straight-through ferrule (91) is embedded in the inner wall of the upper end and the inner wall of the lower end of the second straight-through pipe (9); a plurality of the second straight-through ferrules (91) are respectively sleeved on the outer walls of the branch pipe above the T-shaped tee (6), the two ends of the second air duct (8), and the outlet pipe of the air inlet valve (10).

9. The experimental device for evaluating the compatibility of metal containers with gas fire extinguishing agents according to claim 1, characterized in that: The air intake valve (10) is a needle valve, with an air outlet pipe fixed at its lower end and an air intake pipe (102) fixed at its upper end; a handle (101) is rotatably connected to the side wall of the air intake valve (10) to control the opening and closing of the air intake valve (10).

10. An experimental method for evaluating the compatibility of metal containers with gaseous fire extinguishing agents, characterized in that: A compatibility test is conducted using the experimental device for evaluating the compatibility of a metal container with a gas fire extinguishing agent according to any one of claims 1 to 9, comprising the following steps: S1. Open the air inlet valve and inject the experimental fire extinguishing agent into the experimental tube through the air inlet valve; S2, inject nitrogen into the experimental tube through the inlet valve; S3, transfer the experimental device to the temperature test box; S4. Conduct compatibility experiments according to the set duration; S5. After the experiment, the gas and liquid in the experimental tube are sampled separately; the experimental tube is sampled for morphology observation and mechanical property testing.

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