Experimental device for simulating wall hanging state of foam liquid and evaluation method

Abstract

The invention provides an experimental device for simulating a wall-hanging state of foam liquid. The experimental device comprises an injection unit for providing the foam liquid, a flow guide cover, a test plate, a recycling bin arranged below the test plate and a collection unit, the test plate is obliquely arranged below the flow guide cover, and the collection unit is connected with the injection unit and the recycling bin. Wherein the collection unit is configured to be capable of collecting the foam liquid output quantity of the injection unit, the residence time of the foam liquid on the test plate and the recovery quantity of the foam liquid in the recovery barrel, so that the wall hanging performance of the foam liquid is obtained. In addition, the invention further provides an evaluation method for the wall hanging performance of the foam liquid.

Description

Technical Field

[0001] This invention relates to the field of fire safety technology, specifically to an experimental apparatus for simulating the wall-hanging state of foam liquid, and a method for evaluating the wall-hanging performance of foam liquid. Background Technology

[0002] In recent years, most fires have manifested as three-dimensional flames, such as crown fires, high-rise building exterior fires, and petrochemical plant fires. Foam extinguishing agents have better viscosity than water. Furthermore, the foam generated by a foam generator adheres effectively to the surface of the burning object, thus effectively cooling the ignition point and isolating it from air. Therefore, foam extinguishing agents are commonly used as the primary means of extinguishing fires in serious fire accidents and fire rescue operations. The foam liquid mentioned in this invention refers to the same substance as the foam extinguishing agent.

[0003] Currently, the quality of foam fire extinguishing agents is mainly evaluated based on the testing items in GB15308 "Foam Fire Extinguishing Agents". These testing items mainly include testing the foaming ratio, separation time, extinguishing time, and fire resistance time of the foam liquid. However, relying solely on these testing items is insufficient for a comprehensive assessment of the foam liquid.

[0004] Therefore, an apparatus for detecting foam liquid has been developed in the art to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide an experimental apparatus for simulating the wall-hanging state of foam liquid. This apparatus uses three variables—the angle between the support plate and the horizontal direction, the roughness (Ra) of the test plate, and the ratio of recovered to injected foam liquid—to test the wall-hanging performance of foam liquid under various conditions. Furthermore, a method for evaluating the wall-hanging performance of foam liquid is also proposed.

[0006] According to a first aspect of the present invention, an experimental apparatus for simulating the wall-clinging state of foam liquid is provided, comprising an injection unit for providing foam liquid.

[0007] A flow guide shroud for receiving foam liquid from the injection unit.

[0008] A test plate for receiving foam liquid from within the flow deflector, the test plate being obliquely positioned below the flow deflector.

[0009] The recycling bin located below the test plate, and

[0010] The collection unit is connected to both the injection unit and the recycling bin.

[0011] The acquisition unit is configured to acquire the foam liquid output of the injection unit, the residence time of the foam liquid on the test plate, and the amount of foam liquid recovered in the recovery tank, thereby obtaining the wall adhesion performance of the foam liquid.

[0012] In one embodiment, the fairing is configured as a partial sphere, a partial cylinder, or a partial arc.

[0013] In one embodiment, the test plate includes at least one of stainless steel plate, wood plate and polytetrafluoroethylene plate, and the roughness of each plate is in the range of 0.1 to 6.0 μm.

[0014] In one embodiment, the test plate is selected from a group of multiple test plates with different roughnesses.

[0015] In one embodiment, the experimental apparatus further includes the support plate and a plurality of fasteners arranged on the support plate, wherein the test plate is mounted on the support plate via the fasteners.

[0016] In one embodiment, the experimental apparatus further includes a first pillar and a second pillar extending in a vertical direction, wherein the flow guide is fixedly connected to the first pillar and the support plate is movably connected to the second pillar, thereby allowing the support plate to rotate within a range of 0° to 89°.

[0017] In one embodiment, the support plate includes a first support portion and a second support portion that can partially extend into the recycling bin, wherein the cross-sectional area of ​​the second support portion gradually decreases along the direction of the foam liquid flow.

[0018] In one embodiment, both the first support portion and the second support portion have a blocking portion arranged in a direction perpendicular to the support plate to limit the movement path of the foam liquid.

[0019] In one embodiment, the foaming liquid comes from an injection unit, which includes a foaming liquid storage tank, a nozzle extending horizontally from the foaming liquid storage tank, and a foam generator disposed within the nozzle.

[0020] In one embodiment, the acquisition unit includes a first measuring instrument disposed on the nozzle, a second measuring instrument disposed on the recovery bin, and a third measuring instrument for recording time.

[0021] According to a second aspect of the present invention, a method for evaluating the wall adhesion performance of foam liquid is provided.

[0022] In this process, foam liquid is sprayed towards the flow guide hood using the injection unit of the experimental apparatus as described above, and the foam liquid flows into the recovery tank through the test plate.

[0023] The method includes collecting the foam liquid output of the injection unit, the residence time of the foam liquid on the test plate, and the amount of foam liquid recovered in the recovery tank through the acquisition unit of the experimental device, thereby obtaining the wall adhesion performance of the foam liquid.

[0024] In one embodiment, the angle between the support plate and the horizontal direction is adjusted to obtain the time it takes for the foam liquid to adhere to the test plate at different angles.

[0025] In one embodiment, test plates with different roughness are used to obtain the wall-hanging time of the foam liquid on the test plate under different roughnesses.

[0026] In one embodiment, the time it takes for the foam liquid to adhere to the wall of a test plate is measured when the amount of foam liquid recovered from the recycling tank is different from the amount of foam liquid output from the injection unit. Attached Figure Description

[0027] The invention will now be described in detail with reference to the accompanying drawings, in which:

[0028] Figure 1 This is a partial structural schematic diagram of the experimental apparatus for simulating the wall-hanging state of foam liquid according to the present invention;

[0029] Figure 2 This is a schematic diagram of the injection unit in the experimental apparatus for simulating the wall-hanging state of foam liquid according to the present invention;

[0030] Figure 3 This is a schematic diagram of a test plate in an experimental apparatus for simulating the wall-clinging state of foam liquid according to the present invention.

[0031] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0032] The meanings of the reference numerals in the attached figures are as follows:

[0033] 10. Fairing, 11. First support column,

[0034] 20 Injection unit, 21 Foam liquid storage tank, 22 Nozzle, 23 Foam generator,

[0035] 30 Test board, 31 Support plate, 311 First support section, 312 Second support section, 32 Second pillar.

[0036] 40 recycling bins

[0037] 51 First measuring instrument, 52 Second measuring instrument. Detailed Implementation

[0038] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0039] During the invention process, the inventors noticed that existing technologies only include testing items for foam liquids such as expansion ratio, separation time, extinguishing time, and fire resistance time, but lack relevant testing for the wall adhesion performance of foam liquids. Since the wall adhesion performance of foam liquids is of significant guiding importance for extinguishing three-dimensional flames (such as crown fires, high-rise building exterior fires, and petrochemical plant fires), this research is crucial.

[0040] Therefore, according to a first aspect of the present invention, an experimental apparatus for simulating the wall-clinging state of foam liquid is provided. A detailed description follows.

[0041] Figure 1 This is a partial structural schematic diagram of an experimental apparatus 100 for simulating the wall-hanging state of foam liquid according to the present invention. Figure 2 This is a schematic diagram of the injection unit 20 in the experimental apparatus 100 for simulating the wall-clinging state of foam liquid according to the present invention. For ease of explanation, the foam liquid and foam extinguishing agent mentioned in the present invention are the same thing.

[0042] like Figure 1 and 2 As shown, the experimental apparatus 100 for simulating the wall-hanging state of foam liquid according to the present invention mainly includes an injection unit 20, a flow guide 10, and a test plate 30. The injection unit 20 provides foam liquid, which is emitted to the outside via a foam generator 23 (described below). The flow guide 10 receives the foam liquid from the foam generator 23 and directs it downwards into the test plate 30. The test plate 30 is inclined below the flow guide 10 and receives the foam liquid within the flow guide 10, thereby enabling the testing of the wall-hanging performance of the foam liquid.

[0043] According to the present invention, the experimental apparatus 100 for simulating the wall-hanging state of foam liquid further includes a recovery tank 40. The recovery tank 40 is disposed below the test plate 30 and can recover the foam liquid on the test plate 30 in real time, thereby providing certain data for subsequent testing of the wall-hanging performance of the foam liquid.

[0044] According to the present invention, the experimental apparatus 100 for simulating the wall-hanging state of foam liquid further includes a data acquisition unit. The data acquisition unit is connected to the injection unit 20 and the recovery tank 40, respectively. The data acquisition unit is configured to acquire the output volume of foam liquid from the injection unit 20, the residence time of foam liquid on the test plate 30, and the amount of foam liquid recovered in the recovery tank 40, thereby obtaining the wall-hanging performance of the foam liquid. The details are described below.

[0045] According to one embodiment of the present invention, the flow guide 10 includes, but is not limited to, a partially spherical form, a partially cylindrical form, and a partially arc-shaped form. In this way, the flow guide 10 can effectively receive the foam liquid emitted from the foam generator 23 and can effectively buffer the foam liquid, thereby promoting its flow onto the test plate 30.

[0046] Furthermore, since the interior of the flow guide 10 has an arc-shaped structure, the flow guide 10 can ensure that all the received foam liquid flows onto the test plate 30, thereby effectively improving the accuracy of the test of the foam liquid's wall adhesion performance.

[0047] According to one embodiment of the present invention, when the flow guide 10 is a partial sphere or a partial arc, the cross-sectional area of ​​the fluid flowing into the test plate 30 is relatively small; when the flow guide 10 is a partial cylinder, the cross-sectional area of ​​the fluid flowing into the test plate 30 is relatively large. Therefore, by changing the shape of the flow guide 10, the wall adhesion performance of foam liquid under different flow cross-sectional areas can be tested, thereby providing a certain reference basis for the results of subsequent tests.

[0048] According to one embodiment of the present invention, the test board 30 includes, but is not limited to, stainless steel plates, wooden boards, polytetrafluoroethylene (PTFE) boards, cement boards, and polyethylene boards. In this way, the required fire extinguishing scenario can be simulated more easily and realistically, and the influence of different materials on the wall adhesion performance of the foam liquid can be tested, thereby obtaining more realistic data on the wall adhesion performance of the foam liquid. Therefore, the foam liquid that passes the test can more accurately play its role in actual fire extinguishing, thereby accelerating the fire extinguishing process and ensuring the safety of life and property.

[0049] According to one embodiment of the present invention, the test plate 30 includes, but is not limited to, a flat plate, an arc-shaped plate, and a corrugated plate. Thus, by changing the structure of the test plate 30, it is easier and more realistic to simulate a real fire scene, and the influence of different structures on the wall adhesion performance of the foam liquid can be tested, thereby obtaining more realistic data on the wall adhesion performance of the foam liquid. Compared with the prior art, the present invention can simulate an environment closer to a fire scene, thereby obtaining the real performance of the foam liquid in use, further ensuring the safety of life and property.

[0050] According to one embodiment of the present invention, the test plate 30 is selected from a group of multiple test plates with different roughnesses. That is, test plates with different roughnesses can be replaced according to the needs of the actual testing process, thereby obtaining more realistic data on the wall adhesion performance of the foam liquid. It is worth noting that the different roughnesses mentioned in the present invention refer to different Ra values.

[0051] According to a specific embodiment of the present invention, the roughness (Ra) of the test plate 30 is in the range of 0.1 to 0.8 μm. In this way, the test plate 30 can reproduce a portion of the fire scene environment to the greatest extent possible, thereby measuring the wall adhesion performance of the foam liquid at various roughness (Ra) levels.

[0052] In this way, when faced with fire scenes in different environments, it is possible to select the appropriate foam liquid as the extinguishing agent more quickly and easily, thereby improving the efficiency of fire extinguishing, accelerating the fire extinguishing speed, and further protecting the safety of life and property.

[0053] According to the present invention, the experimental apparatus 100 for simulating the wall-hanging state of foam liquid further includes a support plate 31 and fixing members (not shown). Several fixing members are provided, all arranged on the support plate 31. The test plate 30 can be fixed to the support plate 31 by the fixing members, thereby enabling the replacement of the test plate 30. This ensures good stability of the test plate 30 during testing and allows for rapid disassembly of the test plate 30 when different testing conditions are created, significantly improving testing efficiency.

[0054] In one embodiment, the fastener includes the form of a hook or a groove. This allows for a more stable structure between the test plate 30 and the support plate 31 via the fastener, ensuring the stability of the test plate 30 during testing and effectively improving the accuracy of testing the wall adhesion performance of the foam liquid.

[0055] In another embodiment, the fastener can also be configured with other structures, as long as it provides stable support for the test plate 30.

[0056] According to one embodiment of the present invention, the experimental apparatus 100 for simulating the wall-hanging state of foam liquid further includes a first support column 11. The first support column 11 extends in a vertical direction and is fixedly connected to the flow guide shroud 10. In this way, the flow guide shroud 10 can maintain good stability under the action of the first support column 11.

[0057] Specifically, when the flow guide 10 receives foam liquid emitted from the foam generator 23, the flow guide 10 can always maintain a stable state under the action of the first support column 11, thereby effectively and stably transferring foam liquid to the test plate 30, further improving the success rate and accuracy of testing the wall adhesion performance of foam liquid.

[0058] According to one embodiment of the present invention, the experimental apparatus 100 for simulating the wall-hanging state of foam liquid further includes a second support column 32. The second support column 32 extends vertically and is movably connected to a support plate 31. Specifically, the support plate 31 is hinged to the second support column 32, thereby enabling the support plate 31 to rotate within a range of 0° to 89°.

[0059] Furthermore, the support plate 31 can be fixed to the second support column 32 with each rotation angle, thus ensuring the stability of the foam liquid during the test. In this way, the position of the test plate 30 can be changed by adjusting the angle between the support plate 31 and the horizontal direction, thereby simulating fire environments under various conditions and obtaining more realistic data on the wall adhesion performance of the foam liquid.

[0060] In another embodiment of the invention, both the first support column 11 and the second support column 32 are configured as telescopic rods. This allows for easier adaptation to different nozzle heights 22 (described below) by adjusting the heights of the first support column 11 and the second support column 32, thereby enabling sufficient reception of the foam liquid emitted by the foam generator 23 and further improving the accuracy of the foam liquid's wall adhesion performance test.

[0061] Figure 3 This is a schematic diagram of the test plate 30 in an experimental apparatus 100 for simulating the wall-hanging state of foam liquid according to the present invention. According to the present invention, the support plate 31 includes a first support portion 311 and a second support portion 312. The first support portion 311 is constructed in a square shape and is fixedly connected to the second support portion 312. The cross-sectional area of ​​the second support portion 312 gradually decreases along the direction of foam liquid flow, and its end extends into the recovery tank 40.

[0062] This allows the foam liquid to flow back into the recycling tank 40 more fully, ensuring that the measured amount of foam liquid recycled into the recycling tank 40 is accurate, and further improving the accuracy of the foam liquid wall adhesion performance test.

[0063] According to one embodiment of the present invention, both the first support portion 311 and the second support portion 312 are provided with blocking portions (not shown). The blocking portions are arranged in a direction perpendicular to the support plate 31 and can effectively restrict the movement path of the foam liquid. The test plate 30 is arranged inside the first support portion 311, and both ends of the test plate 30 are inside the blocking portions.

[0064] In this way, the foam liquid flowing to both sides of the test plate 30 can be fully recovered and flow into the recovery tank 40 through the second support part 312, thereby ensuring that the amount of recovery in the recovery tank 40 is accurate and further improving the accuracy of the foam liquid wall adhesion performance test.

[0065] According to the present invention, the injection unit 20 includes a foam liquid storage tank 21, a nozzle 22, and a foam generator 23. The nozzle 22 extends horizontally from the foam liquid storage tank 21 and is used to supply foam liquid into the flow guide 10. The foam generator 23 is mounted on the nozzle 22, thereby causing the foam liquid to mix thoroughly with air to form foam injected into the flow guide 10. This is well known to those skilled in the art and will not be described in detail here. Furthermore, a valve 24 is provided at the inlet end of the nozzle 22, which controls the opening and closing of the nozzle 22.

[0066] According to one embodiment of the present invention, the acquisition unit includes a first measuring instrument 51, a second measuring instrument 52, and a third measuring instrument (not shown). The first measuring instrument 51 is mounted on the nozzle 22, enabling real-time measurement of the foam liquid output from the injection unit 20. The second measuring instrument 52 is mounted on the recovery tank 40, enabling real-time measurement of the amount of foam recovered within the recovery tank 40.

[0067] The third measuring instrument is used to record time. Specifically, it records the time the foam liquid spends on the test plate 30 when other conditions change (e.g., changing the angle between the support plate 31 and the horizontal direction, changing the roughness Ra of the test plate 30, or changing the ratio of foam recovery to foam output).

[0068] In another embodiment of the present invention, the first measuring instrument 51 and the second measuring instrument 52 can also be configured as weighing instruments. In this way, the first measuring instrument 51 and the second measuring instrument 52 are respectively arranged at the bottom of the foam liquid storage tank 21 and the bottom of the recovery tank 40, so as to measure the overall mass of the foam liquid storage tank 21 and the recovery tank 40 respectively by the first measuring instrument 51 and the second measuring instrument 52, thereby obtaining the ratio of the output amount of foam liquid to the recovery amount of foam liquid.

[0069] According to a second aspect of the present invention, a method for evaluating the wall adhesion performance of foam liquid is proposed. This method mainly involves collecting data from the foam liquid output of the injection unit 20, the residence time of the foam liquid on the test plate 30, and the amount of foam liquid recovered in the recovery tank 40 using a data acquisition unit, thereby determining the wall adhesion performance of the foam liquid.

[0070] According to one embodiment of the present invention, the angle between the support plate 31 and the horizontal direction is adjusted, and the results are recorded by the first measuring instrument 51, the second measuring instrument 52 and the third measuring instrument after each adjustment, so as to obtain the relationship between the wall adhesion mass and time of the foam liquid under different angles.

[0071] According to one embodiment of the present invention, the roughness (Ra) of the test plate 30 is adjusted, and the results are recorded by the first measuring instrument 51, the second measuring instrument 52 and the third measuring instrument after each adjustment, so as to obtain the relationship between the wall adhesion quality and time of the foam liquid under different roughness Ra values.

[0072] According to one embodiment of the present invention, the foam liquid output and foam liquid recovery at different ratios are recorded by a first measuring instrument 51 and a second measuring instrument 52, thereby obtaining the foam liquid wall adhesion time under different ratios.

[0073] The first embodiment of the present invention is described below.

[0074] First, 3% (AFFF, -10℃) aqueous film-forming foam extinguishing agent was mixed with water in proportion to form foam liquid and sample 1 was prepared; sample 1 was filled into a 15L stainless steel foam liquid storage tank 21; foam liquid storage tank 21 was placed on a weighing scale.

[0075] Then, the test plate 30 is mounted on the support plate 31 using fasteners.

[0076] Then, foam liquid is sprayed through the foam generator 23 into the flow hood 10.

[0077] Finally, the foam liquid in the flow guide shroud 10 flows to the test plate 30, and the residence time of the foam liquid on the test plate 30 is recorded by the third measuring instrument, and the amount of recovery in the recovery bucket 40 is recorded by the second measuring instrument 52.

[0078] Initially, the total weight of the foam liquid storage tank 21 is 22.4 kg. After the spraying is completed, the total weight of the foam liquid storage tank 21 is 20.6 kg, thus the injected amount of foam liquid is 1.8 kg.

[0079] The support plate 31 has an angle of 60° with the horizontal direction, and the roughness (Ra) of the test plate 30 is 3.0 μm.

[0080] The injection volume of foam liquid was 1.8 kg, the recovery volume of foam liquid was 0.9 kg, and the test result of the third measuring instrument was 3 minutes and 15 seconds.

[0081] Test results of wall adhesion performance: Sample 1 on a surface with a roughness (Ra) grade 3, 50% wall adhesion time is 3 minutes and 15 seconds.

[0082] The second embodiment of the present invention is described below.

[0083] First, 6% (P, -5℃) protein-type foam extinguishing agent was mixed with water to form a foam liquid and sample 2 was prepared. Sample 2 was then filled into a foam liquid storage tank 21.

[0084] Then, the test plate 30 is mounted on the support plate 31 using fasteners.

[0085] Then, foam liquid is sprayed through the foam generator 23 into the flow hood 10. The injection volume of foam liquid is determined by the first measuring gauge 51.

[0086] Finally, the foam liquid in the flow guide shroud 10 flows to the test plate 30, and the residence time of the foam liquid on the test plate 30 is recorded by the third measuring instrument, and the amount of recovery in the recovery bucket 40 is recorded by the second measuring instrument 52.

[0087] The support plate 31 has an angle of 45° with the horizontal direction, and the roughness (Ra) of the test plate 30 is 5.0 μm.

[0088] The injection volume of foam liquid was 4.08 kg. The recovery volume of foam liquid was 1.02 kg. The test result of the third measuring instrument was 2 minutes and 33 seconds.

[0089] Test results of wall adhesion performance: Sample 2, on a surface with a roughness (Ra) grade 5, had a 25% wall adhesion time of 2 minutes and 33 seconds.

[0090] It is easy to understand that in this embodiment, the foam liquid injection volume (kg) = flow rate (L / min) × density (kg / L) × time (min), which is well known to those skilled in the art.

[0091] The third embodiment of the present invention is described below.

[0092] First, mix 3% (AFFF / AR, -5℃) type alcohol-resistant foam extinguishing agent with water in a certain proportion to form foam liquid and make sample 3. Fill sample 3 into foam liquid storage tank 21 of a certain volume; place foam liquid storage tank 21 on a weighing scale.

[0093] Then, the test plate 30 is mounted on the support plate 31 using fasteners.

[0094] Then, foam liquid is sprayed through the foam generator 23 into the flow hood 10.

[0095] Finally, the foam liquid in the flow guide shroud 10 flows to the test plate 30, and the residence time of the foam liquid on the test plate 30 is recorded by the third measuring instrument, and the amount of recovery in the recovery bucket 40 is recorded by the second measuring instrument 52.

[0096] Initially, the total weight of the foam liquid storage tank 21 is 35.7 kg. After the spraying is completed, the total weight of the foam liquid storage tank 21 is 30.7 kg, indicating that the amount of foam liquid injected is 5 kg.

[0097] The support plate 31 has an angle of 70° with the horizontal direction, and the roughness (Ra) of the test plate 30 is 0.1 mm.

[0098] The injection volume of foam liquid was 5 kg, the recovery volume of foam liquid was 2.5 kg, and the test result of the third measuring instrument was 7 minutes and 17 seconds.

[0099] Test results of wall adhesion performance: Sample 1 on a surface with a roughness (Ra) of 0.1, the 50% wall adhesion time was 7 minutes and 17 seconds.

[0100] The fourth embodiment of the present invention is described below. The specific testing process for this embodiment is the same as that in Embodiment 2.

[0101] In this embodiment, the measurement value of the second measuring instrument 52 is always 50% of the measurement value of the first measuring instrument 51. The roughness (Ra) of the test plate 30 is always 0.25. The wall adhesion time of the foam liquid under different angles is obtained by changing the angle between the support plate 31 and the horizontal direction. The angles between the support plate 31 and the horizontal direction are 20°, 40°, 60° and 80°.

[0102] 50% hanging time at different horizontal angles

[0103] Horizontal angle (°) 50% wall-mounting time (s) 20 855 40 654 60 544 80 212

[0104] The fifth embodiment of the present invention is described below. The specific testing process for this embodiment is the same as that in Embodiment 2.

[0105] In this embodiment, the measurement value of the second measuring instrument 52 is always 25% of the measurement value of the first measuring instrument 51. The angle between the support plate 31 and the horizontal direction is always 20°. The wall adhesion time of the foam liquid at different roughnesses (Ra) is obtained by changing the roughness (Ra) of the test plate 30. The roughnesses (Ra) are 1.0 μm, 3.0 μm, 10.0 μm, and 15.0 μm.

[0106] 25% wall-hanging time of foam flow boards with different roughness (Ra)

[0107]

[0108]

[0109] The sixth embodiment of the present invention is described below. The specific testing process for this embodiment is the same as that in Embodiment 2.

[0110] In this embodiment, the angle between the support plate 31 and the horizontal direction is always 20°. The roughness (Ra) of the test plate 30 is always 15 μm. The wall adhesion time of the foam liquid at different ratios is obtained by changing the ratio of the recovered amount to the injected amount of the foam liquid. The ratio of the recovered amount to the injected amount of the foam liquid is 25%, 50%, and 75%.

[0111] Different proportions of hanging time

[0112]

[0113] This invention proposes a method for evaluating the wall adhesion performance of foam liquid. It primarily uses three variables—the angle between the support plate 31 and the horizontal direction, the roughness (Ra) of the test plate 30, and the ratio of recovered to injected foam liquid—to test the wall adhesion performance of foam liquid under various conditions. Compared to existing technologies for testing foam liquid, the wall adhesion performance of the foam liquid tested using this invention is approximately the same as its performance during actual fire extinguishing. Furthermore, based on the measured wall adhesion performance of the foam liquid, its maximum performance can be fully utilized during fire extinguishing.

[0114] It is worth noting that this invention proposes a new testing item for foam liquid, which is mainly used to measure the wall adhesion performance of foam liquid (foam liquid fire extinguishing agent). To obtain other parameters of the foam liquid, it is still necessary to conduct corresponding tests according to the testing items in GB15308 "Foam Fire Extinguishing Agents".

[0115] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An experimental apparatus for simulating the wall-clinging state of foam liquid, comprising: The injection unit (20) for providing foam liquid, A flow guide (10) for receiving foam liquid from the injection unit (20), A test plate (30) for receiving foam liquid from within the flow deflector (10), the test plate being obliquely positioned below the flow deflector (10). The recycling bin (40) is located below the test plate (30), and The collection unit is connected to both the injection unit (20) and the recycling bin (40). The acquisition unit is configured to acquire the foam liquid output of the injection unit (20), the residence time of the foam liquid on the test plate (30), and the amount of foam liquid recovered in the recovery tank (40), thereby obtaining the wall adhesion performance of the foam liquid.

2. The experimental apparatus for simulating the wall-clinging state of foam liquid according to claim 1, characterized in that, The fairing (10) is constructed in the form of a partial sphere, a partial cylinder, or a partial arc.

3. The experimental apparatus for simulating the wall-clinging state of foam liquid according to claim 2, characterized in that, The test plate (30) includes at least one of stainless steel plate, wood plate and polytetrafluoroethylene plate, and its roughness is in the range of 0.1 to 6.0 μm.

4. The experimental apparatus for simulating the wall-clinging state of foam liquid according to claim 3, characterized in that, The test plate (30) is selected from a group of multiple test plates with different roughness.

5. The experimental apparatus for simulating the wall-clinging state of foam liquid according to claim 4, characterized in that, The experimental apparatus also includes the support plate (31) and a number of fasteners arranged on the support plate (31), and the test plate (30) is mounted on the support plate (31) by the fasteners.

6. The experimental apparatus for simulating the wall-clinging state of foam liquid according to claim 5, characterized in that, The experimental apparatus further includes a first support column (11) and a second support column (32) extending in a vertical direction, wherein the flow guide (10) is fixedly connected to the first support column (11), and the support plate (31) is movably connected to the second support column (32), thereby allowing the support plate (31) to rotate within the range of 0° to 89°.

7. The experimental apparatus for simulating the wall-clinging state of foam liquid according to claim 6, characterized in that, The support plate (31) includes a first support portion (311) and a second support portion (312) that can partially extend into the recycling bin (40), wherein the cross-sectional area of ​​the second support portion (312) gradually decreases along the direction of the foam liquid flow.

8. The experimental apparatus for simulating the wall-clinging state of foam liquid according to claim 7, characterized in that, Both the first support portion (311) and the second support portion (312) have a blocking portion arranged in a direction perpendicular to the support plate (31) to limit the movement path of the foam liquid.

9. The experimental apparatus for simulating the wall-clinging state of foam liquid according to claim 8, characterized in that, The foam liquid comes from an injection unit (20), which includes a foam liquid storage tank (21), a nozzle (22) extending horizontally from the foam liquid storage tank (21), and a foam generator (23) arranged in the nozzle (22).

10. The experimental apparatus for simulating the wall-clinging state of foam liquid according to claim 9, characterized in that, The acquisition unit includes a first measuring instrument (51) mounted on the nozzle (22), a second measuring instrument (52) mounted on the recycling bin (40), and a third measuring instrument for recording time.

11. A method for evaluating the wall adhesion performance of foam liquid. in, Using the injection unit of the experimental apparatus according to any one of claims 1 to 10, foam liquid is sprayed towards the flow guide shroud, causing the foam liquid to flow through the test plate into the recovery tank. The method includes collecting the foam liquid output of the injection unit (20), the residence time of the foam liquid on the test plate (30), and the amount of foam liquid recovered in the recovery tank (40) through the acquisition unit of the experimental device, thereby obtaining the wall adhesion performance of the foam liquid.

12. The evaluation method according to claim 11, characterized in that, Adjust the angle between the support plate (31) and the horizontal direction to obtain the time it takes for the foam liquid to adhere to the test plate (30) at different angles.

13. The evaluation method according to claim 11, characterized in that, By changing the test plate with different roughness, the wall-hanging time of the foam liquid on the test plate (30) under different roughness is obtained.

14. The evaluation method according to claim 11, characterized in that, The time it takes for the foam liquid to adhere to the wall of the test plate (30) is measured when the amount of foam liquid recovered in the recycling tank (40) is different from the amount of foam liquid output from the injection unit (20).

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