Compressed air foam pipe network conveying experiment system

Abstract

The invention discloses a compressed air foam pipe network conveying experiment system which is characterized in that compressed air foam is generated and supplied through a supply unit, the supply unit is communicated with a pipe network conveying unit, and the pipe network conveying unit comprises at least four conveying pipelines; the at least four conveying pipelines at least comprise a horizontal state, a vertical state, an inclined climbing state and an inclined descending state so as to simulate a multi-working-condition state in the actual conveying process, and compressed air foam conveyed in different states or in different states in a combined mode is collected through the liquid collecting unit so as to obtain the compressed air foam under different working conditions. Then the microscopic state of the collected compressed air foam is detected through a microscopic characteristic testing unit, the drainage rate of the collected compressed air foam is detected through a drainage characteristic testing unit, and analysis is conducted through a control unit to obtain parameter data of the compressed air foam conveyed under different working conditions; the theoretical basis of the conveying characteristic of the compressed air foam in a pipe network is perfected, and the theoretical basis is provided for follow-up fire fighting.

Description

Technical Field

[0001] This application relates to the field of fire protection engineering technology, and more specifically, to a compressed air foam pipeline delivery experimental system. Background Technology

[0002] With the acceleration of urbanization in my country, the number of super high-rise buildings is constantly increasing, and the resulting fire prevention and control problems are becoming increasingly prominent. Compared with traditional fire extinguishing media, compressed air foam has a low density and small vertical transport pressure loss. Under the same pressure conditions, it can be transported to higher positions and still maintain good fire extinguishing performance. Therefore, compressed air foam systems are gradually developing. Compressed air foam is a two-phase flow with a high degree of gas-liquid mixing and a large proportion of gas phase. Its flow characteristics are fundamentally different from those of traditional fire extinguishing agents in pipeline networks. Especially in the process of vertical and horizontal long-distance transportation, the pressure decay law is complex and affected by a variety of factors. However, most existing experimental platforms simulate single working conditions, resulting in incomplete theoretical research on the transportation characteristics of compressed air foam in pipeline networks and a lack of scientific basis.

[0003] In conclusion, how to improve the theoretical basis for the delivery characteristics of compressed air foam in pipeline networks is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a compressed air foam pipeline transportation experimental system to improve the theoretical basis for the transportation characteristics of compressed air foam in pipelines.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] An experimental system for transporting compressed air foam via a pipeline network includes: a supply unit for generating and supplying compressed air foam; a pipeline transport unit connected to the supply unit and used to transport the compressed air foam generated by the supply unit, the pipeline transport unit including at least four transport pipelines, the at least four transport pipelines including at least a horizontal state, a vertical state, an inclined climbing state, and an inclined descending state; a liquid collection unit for collecting the compressed air foam transported by the pipeline transport unit, and the liquid collection unit is capable of collecting compressed air foam transported in different states or combinations of different states; a microscopic characteristic testing unit for detecting the microscopic morphology of the compressed air foam collected by the liquid collection unit; a liquid separation characteristic testing unit for detecting the liquid separation rate of the compressed air foam collected by the liquid collection unit; and a control unit communicatively connected to the supply unit, the pipeline transport unit, the microscopic characteristic testing unit, and the liquid separation characteristic testing unit.

[0007] In some embodiments, the supply unit includes: a water tank filled with a premixed liquid; an air compressor for providing compressed air; and a mixer connected to both the water tank and the air compressor for generating compressed air foam.

[0008] In some embodiments, the pipeline delivery unit includes a first delivery pipeline, a second delivery pipeline, a third delivery pipeline, a fourth delivery pipeline, and a fifth delivery pipeline connected in sequence; a first end of the first delivery pipeline is connected to the mixer, a second end of the first delivery pipeline is connected to the second delivery pipeline via a first connector, the second delivery pipeline is connected to the third delivery pipeline via a second connector, the third delivery pipeline is connected to the fourth delivery pipeline via a third connector, and the fourth delivery pipeline is connected to the fifth delivery pipeline via a fourth connector; the output end of the fifth delivery pipeline is connected to a fire sprinkler head to spray the delivered compressed air foam to the liquid collection unit via the fire sprinkler head.

[0009] In some embodiments, the first connector, the second connector, the third connector, and the fourth connector are all rotatable connectors, and the adjustment range of the first connector, the second connector, the third connector, and the fourth connector is 0°-90°.

[0010] In some embodiments, the first delivery pipeline is horizontal, supported by a first support, and equipped with a first pressure gauge, a first drain valve, and a first shut-off valve; the second delivery pipeline is inclined and ascending, supported by a second support, and equipped with a second pressure gauge, a second drain valve, and a second shut-off valve; the third delivery pipeline is inclined and descending, supported by a third support, and equipped with a third pressure gauge, a third drain valve, and a third shut-off valve; the fourth delivery pipeline is vertical, and equipped with a fourth pressure gauge; the fifth delivery pipeline is supported by a fifth support, and equipped with a fifth pressure gauge.

[0011] In some embodiments, the first bracket, the second bracket, the third bracket, and the fifth bracket are all height-adjustable brackets, and the first bracket, the second bracket, the third bracket, and the fifth bracket are all fixed to the corresponding delivery pipeline by clamps, and the clamps are adjustable clamps.

[0012] In some embodiments, the liquid collection unit includes: a liquid collection tank located at the output end of the fifth delivery pipeline, the liquid collection tank being used to collect compressed air foam ejected from the fire sprinkler head; a first liquid receiving dish located at a position corresponding to the first drain valve and used to collect compressed air foam in the first delivery pipeline; a second liquid receiving dish located at a position corresponding to the second drain valve and used to collect compressed air foam in the second delivery pipeline; and a third liquid receiving dish located at a position corresponding to the third drain valve and used to collect compressed air foam in the third delivery pipeline.

[0013] In some embodiments, the control unit includes an operation module and a main control module that are connected in communication; the microscopic characteristic testing unit includes a microscope, which is connected in communication with the main control module.

[0014] In some embodiments, the liquid precipitation characteristic testing unit includes a sand core funnel, a beaker, an iron stand, and a high-precision electronic balance; the high-precision electronic balance is communicatively connected to the main control module.

[0015] In some embodiments, the compressed air foam provided by the supply unit has a gas-liquid ratio of 5-20.

[0016] The compressed air foam pipeline transportation experimental system provided in this application includes a supply unit for generating and supplying compressed air foam. The supply unit is connected to a pipeline transportation unit, which includes at least four transportation pipelines. These pipelines represent at least four states: horizontal, vertical, inclined ascending, and inclined descending, to simulate multiple operating conditions during actual transportation. A liquid collection unit collects compressed air foam transported under different states or combinations thereof to obtain compressed air foam under different operating conditions. A microscopic characteristic testing unit detects the microscopic state of the collected compressed air foam, and a liquid precipitation characteristic testing unit detects the liquid precipitation rate of the collected compressed air foam. The data is then analyzed by a control unit to obtain parameter data of the compressed air foam transported under different operating conditions. This improves the theoretical basis for the transportation characteristics of compressed air foam in a pipeline network and provides a theoretical foundation for subsequent fire protection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the structure of the compressed air foam pipeline delivery experimental system provided in the embodiments of this application;

[0019] Figure 2 The control principle diagram of the compressed air foam pipeline transportation experimental system provided in the embodiments of this application is shown.

[0020] Explanation of reference numerals in the attached figures:

[0021] 110 - Water tank, 120 - Air compressor, 130 - Mixer;

[0022] 200-Pipeline delivery unit, 210-First delivery pipeline, 211-First support, 212-First pressure gauge, 213-First drain valve, 214-First shut-off valve;

[0023] 220 - Second delivery pipeline, 221 - Second support, 222 - Second pressure gauge, 223 - Second drain valve, 224 - Second shut-off valve

[0024] 230 - Third delivery pipeline, 231 - Third support, 232 - Third pressure gauge, 233 - Third drain valve, 234 - Third shut-off valve

[0025] 240 - Fourth delivery pipeline, 241 - Fourth pressure gauge

[0026] 250 - Fifth delivery pipeline, 251 - Fifth support, 252 - Fifth pressure gauge, 253 - Fire sprinkler head

[0027] 261-First connector, 262-Second connector, 263-Third connector, 264-Fourth connector;

[0028] 310 - First receiving dish, 320 - Second receiving dish, 330 - Third receiving dish, 340 - Collection tank;

[0029] 410 - Microscopic equipment;

[0030] 510-Sand core funnel, 520-Beaker, 530-Iron stand, 540-High-precision electronic balance;

[0031] 610 - Operation module, 620 - Main control module. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0034] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0035] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0036] The terms "parallel" and "perpendicular" used in this application refer to "basically parallel" and "basically perpendicular" in practical operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0037] like Figures 1-2As shown in the embodiment of this application, the compressed air foam pipeline transportation experimental system includes a supply unit, a pipeline transportation unit 200, a liquid collection unit, a microscopic characteristic testing unit, a liquid separation characteristic testing unit, and a control unit. The supply unit generates and supplies compressed air foam. The pipeline transportation unit 200 is connected to the supply unit and is used to transport the compressed air foam generated by the supply unit. The pipeline transportation unit 200 includes at least four transportation pipelines, each including at least a horizontal state, a vertical state, an inclined climbing state, and an inclined descending state, to simulate multiple working conditions during actual transportation. The liquid collection unit collects the compressed air foam transported by the pipeline transportation unit, and the liquid collection unit can collect compressed air foam transported in different states or combinations of different states to obtain compressed air foam under different working conditions. The microscopic morphology of compressed air foam collected by the liquid collection unit is detected by the microscopic characteristic testing unit, and the liquid separation rate of compressed air foam collected by the liquid collection unit is detected by the liquid separation characteristic testing unit. The control unit is communicatively connected to the supply unit, the pipeline transportation unit 200, the microscopic characteristic testing unit, and the liquid separation characteristic testing unit. The detection data of the microscopic characteristic testing unit and the liquid separation characteristic testing unit are analyzed by the control power supply to obtain parameter data of compressed air foam delivered under different working conditions. This improves the theoretical basis for the delivery characteristics of compressed air foam in the pipeline network and provides a theoretical basis for subsequent fire protection.

[0038] like Figure 1 As shown, the supply unit includes a water tank 110, an air compressor 120, and a mixer 130; wherein, the water tank 110 is filled with premixed liquid, the air compressor 120 is used to provide compressed air, and both the water tank 110 and the air compressor 120 are connected to the mixer 130 through connecting pipes, and the mixer 130 generates compressed air foam.

[0039] In this application, the water tank 110 has a flow regulating valve connected to a control unit to regulate the flow rate of the premixed liquid. The air compressor 120 is connected to the control unit, which can regulate the output gas pressure and flow rate of the air compressor 120. By adjusting the flow rate of the premixed liquid and the pressure and flow rate of the compressed air, the mixer 130 can provide compressed air foam with a gas-liquid ratio range of 5-20. The mixer 130 is connected to the control unit, which can control the supply flow rate of the compressed air foam, with an adjustment range of 5L / min-50L / min, to provide different experimental ranges.

[0040] like Figure 1 As shown, the pipeline transportation unit 200 includes a first transportation pipeline 210, a second transportation pipeline 220, a third transportation pipeline 230, a fourth transportation pipeline 240, and a fifth transportation pipeline 250 connected in sequence.

[0041] The first end of the first delivery pipeline 210 is connected to the mixer 130. The second end of the first delivery pipeline 210 is connected to the second delivery pipeline 220 through the first connector 261. The second delivery pipeline 220 is connected to the third delivery pipeline 230 through the second connector 262. The third delivery pipeline 230 is connected to the fourth delivery pipeline 240 through the third connector 263. The fourth delivery pipeline 240 is connected to the fifth delivery pipeline 250 through the fourth connector 264. A fire sprinkler head 253 is connected to the output end of the fifth delivery pipeline 250 so that the compressed air foam delivered can be sprayed to the liquid collection unit for collection through the fire sprinkler head 253.

[0042] In this application, the first connector 261, the second connector 262, the third connector 263, and the fourth connector 264 are all rotating connectors with built-in rotating hinges. The adjustment range of the first connector 261, the second connector 262, the third connector 263, and the fourth connector 264 is 0°-90°. The two ends of the first connector 261, the second connector 262, the third connector 263, and the fourth connector 264 are respectively sealed and fixed to the corresponding conveying pipeline to ensure the sealing of the compressed air foam conveying process. In this way, by adjusting the connection angle of the corresponding connector, the corresponding conveying pipeline can be in different working conditions to provide a variety of simulated working conditions and further improve the theoretical basis.

[0043] like Figure 1 As shown, the first delivery pipeline 210 is in a horizontal state and is supported by the first bracket 211. The first delivery pipeline 210 is equipped with a first pressure gauge 212, a first drain valve 213 and a first shut-off valve 214, so as to obtain the pressure change of the compressed air foam in the first delivery pipeline 210 in real time through the first pressure gauge 212 connected to the control unit.

[0044] The second delivery pipeline 220 is in an inclined climbing state, and the climbing angle can be 45°. The second delivery pipeline 220 is supported by the second bracket 221. The second delivery pipeline 220 is equipped with a second pressure gauge 222, a second drain valve 223 and a second shut-off valve 224, so as to obtain the pressure change of the compressed air foam in the second delivery pipeline 220 in real time through the second pressure gauge 222 connected to the control unit.

[0045] The third delivery pipeline 230 is in a tilted downward state with an inclination angle of 30°. The third delivery pipeline 230 is supported by the third bracket 231. The third delivery pipeline 230 is equipped with a third pressure gauge 232, a third drain valve 233, and a third shut-off valve 234. The pressure change of the compressed air foam in the third delivery pipeline 230 can be obtained in real time by connecting the control unit through the third pressure gauge 232.

[0046] The fourth delivery pipeline 240 is in a vertical state, and a fourth pressure gauge 241 is installed on the fourth delivery pipeline 240 so as to connect the control unit through the fourth pressure gauge 241 to obtain the pressure change of the compressed air foam in the fourth delivery pipeline 240 in real time.

[0047] The fifth delivery pipeline 250 is supported by the fifth bracket 251, and a fifth pressure gauge 252 is installed on the fifth delivery pipeline 250 so as to obtain the pressure change of the compressed air foam in the fifth delivery pipeline 250 in real time through the fifth pressure gauge 252 connected to the control unit.

[0048] In this application, the first drain valve 213, the first shut-off valve 214, the second drain valve 223, the second shut-off valve 224, the third drain valve 233, the third shut-off valve 234, and the fire sprinkler head 253 can all be electric valves and are all connected to a control unit so that the opening and closing of the first drain valve 213, the first shut-off valve 214, the second drain valve 223, the second shut-off valve 224, the third drain valve 233, the third shut-off valve 234, and the fire sprinkler head 253 can be controlled by the control unit.

[0049] Of course, the first drain valve 213, the first shut-off valve 214, the second drain valve 223, the second shut-off valve 224, the third drain valve 233, the third shut-off valve 234, and the fire sprinkler head 253 can also be mechanical valves that can be manually opened and closed by the operator. This application embodiment does not limit this.

[0050] In this application, the first support 211, the second support 221, the third support 231, and the fifth support 251 are all high-strength structures with high load-bearing capacity and stability. Furthermore, the first support 211, the second support 221, the third support 231, and the fifth support 251 are all height-adjustable through threaded connections to support corresponding conveying pipelines for different height working conditions, simulating different height layout conditions. The height adjustment range is 0.5m-1.5m.

[0051] Furthermore, the first support 211, the second support 221, the third support 231, and the fifth support 251 are all fixed to the corresponding conveying pipeline by clamps, and the clamps are all adjustable clamps to correspond to conveying pipelines with diameters of 25m-100m.

[0052] like Figure 1As shown, the liquid collection unit includes a liquid collection tank 340, a first liquid receiving dish 310, a second liquid receiving dish 320, and a third liquid receiving dish 330. The liquid collection tank 340 is located at the output end of the fifth delivery pipeline 250 and is used to collect compressed air foam ejected from the fire sprinkler head 253. The first liquid receiving dish 310 is located at the position corresponding to the first drain valve 213 and is used to collect compressed air foam within the first delivery pipeline 210. The second liquid receiving dish 320 is located at the position corresponding to the second drain valve 223 and is used to collect compressed air foam within the second delivery pipeline 220. The third liquid receiving dish 330 is located at the position corresponding to the third drain valve 233 and is used to collect compressed air foam within the third delivery pipeline 230. Thus, during the experiment, the corresponding drain valves can be opened as needed to collect compressed air foam from different locations, allowing for the detection of parameter data for compressed air foam at different operating conditions, thereby further refining the theoretical basis.

[0053] It should be noted that the first liquid receiving dish 310, the second liquid receiving dish 320, the third liquid receiving dish 330, and the liquid collection tank 340 are all movable and can be moved to the corresponding position according to actual needs to ensure the collection of compressed air foam.

[0054] like Figure 2 As shown in this application, the control unit includes an operation module 610 and a main control module 620 connected by communication. The operator can operate the operation module 610 to transmit control signals through the main control module 620 to control various components. The flow regulating valve of the water tank 110, the air compressor 120, the mixer 130, the first pressure gauge 212, the second pressure gauge 222, the third pressure gauge 232, the fourth pressure gauge 241, the fifth pressure gauge 252, the first drain valve 213, the first shut-off valve 214, the second drain valve 223, the second shut-off valve 224, the third drain valve 233, the third shut-off valve 234, and the fire sprinkler head 253 mentioned above are all connected to the main control module 620 so that they can be controlled by the operation module 610.

[0055] like Figure 1 As shown, the microscopic property testing unit includes a microscope 410, which is communicatively connected to the main control module 620. During the experiment, after the compressed air foam is collected, it is quickly transferred to a glass slide and placed under the microscope 410 for observation. The microscope 410 can magnify 100-10000 times to obtain microscopic morphological parameters such as the particle size and distribution density of the bubbles in the collected compressed air foam, and uploads the image data to the main control module 620 for the operator to obtain and analyze.

[0056] like Figure 1As shown, the liquid precipitation characteristic test unit includes a sand core funnel 510, a beaker 520, an iron stand 530, and a high-precision electronic balance 540. The high-precision electronic balance 540 is communicatively connected to the main control module 620. The liquid precipitation characteristic test unit can measure the liquid precipitation rate of the collected compressed air foam and upload it to the main control module 620 for data storage and subsequent analysis.

[0057] It should be noted that the liquid separation rate refers to the speed at which the liquid (mainly a mixture of water and extinguishing agent in compressed air foam) encapsulated within the foam separates from the foam structure under the action of gravity. The liquid separation rate can provide data on the stability, coverage, and isolation capabilities of the foam, thus providing a theoretical basis for the application of compressed air foam in the field of fire protection.

[0058] In the experimental process of the compressed air foam pipeline transportation system provided in this application embodiment, the distribution structure of each transportation pipeline in the pipeline transportation unit is first set according to the research requirements to simulate the pipeline routing under different working conditions, and is supported by corresponding brackets. Before starting, the sealing of each component connection is checked, and all shut-off valves and fire sprinklers 253 are ensured to be in the closed state. Then, the water tank 110 and air compressor 120 are opened, and the liquid supply flow rate and gas-liquid ratio are set. After the mixer 130 stably outputs compressed air foam, the shut-off valves at designated positions are opened as needed, so that the compressed air foam enters different sections for corresponding analysis. During the process, pressure data was uploaded via corresponding pressure gauges. Part of the collected compressed air foam was used for microscopic characteristic testing with microscopic equipment 410, and another part was used for liquid precipitation characteristic testing. All data were uploaded to the main control module 620. After the experiment had been running for a period of time, the supply of compressed air foam was stopped, the air compressor 120 and water tank 110 were shut off, the remaining compressed air foam was drained, and all pipelines and equipment were cleaned. Data was collected and analyzed to obtain parameter data of compressed air foam delivered under different working conditions, thus improving the theoretical basis for the delivery characteristics of compressed air foam in the pipeline network and providing a theoretical foundation for subsequent fire protection.

[0059] The above description of the embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A compressed air foam pipeline delivery experimental system, characterized in that, include: A supply unit for generating and supplying compressed air foam; A pipeline delivery unit (200) is connected to a supply unit and is used to deliver compressed air foam generated by the supply unit. The pipeline delivery unit (200) includes at least four delivery pipelines, and the at least four delivery pipelines include at least a horizontal state, a vertical state, an inclined climbing state, and an inclined descending state. A liquid collection unit is used to collect compressed air foam after it is delivered by the pipeline delivery unit, and the liquid collection unit can collect compressed air foam after delivery in different states or combinations of different states. A microstructure testing unit is used to detect the microstructure of the compressed air foam collected by the liquid collection unit. A liquid separation characteristic testing unit is used to detect the liquid separation rate of the compressed air foam collected by the liquid collection unit; The control unit is communicatively connected to the supply unit, the pipeline delivery unit (200), the microscopic characteristic testing unit, and the liquid separation characteristic testing unit.

2. The compressed air foam pipeline delivery experimental system according to claim 1, characterized in that, The supply unit includes: Water tank (110), the water tank (110) being filled with premixed liquid; An air compressor (120) is used to provide compressed air; A mixer (130) is connected to both the water tank (110) and the air compressor (120), and the mixer (130) is used to generate compressed air foam.

3. The compressed air foam pipeline transportation experimental system according to claim 2, characterized in that, The pipeline transportation unit (200) includes a first transportation pipeline (210), a second transportation pipeline (220), a third transportation pipeline (230), a fourth transportation pipeline (240), and a fifth transportation pipeline (250) connected in sequence. The first end of the first delivery pipeline (210) is connected to the mixer (130), the second end of the first delivery pipeline (210) is connected to the second delivery pipeline (220) through the first connector (261), the second delivery pipeline (220) is connected to the third delivery pipeline (230) through the second connector (262), the third delivery pipeline (230) is connected to the fourth delivery pipeline (240) through the third connector (263), and the fourth delivery pipeline (240) is connected to the fifth delivery pipeline (250) through the fourth connector (264). The output end of the fifth delivery pipeline (250) is connected to a fire sprinkler head (253) so that the delivered compressed air foam is sprayed to the liquid collection unit through the fire sprinkler head (253).

4. The compressed air foam pipeline transportation experimental system according to claim 3, characterized in that, The first connector (261), the second connector (262), the third connector (263), and the fourth connector (264) are all rotating connectors, and the adjustment range of the first connector (261), the second connector (262), the third connector (263), and the fourth connector (264) is 0°-90°.

5. The compressed air foam pipeline transportation experimental system according to claim 3, characterized in that, The first delivery pipeline (210) is in a horizontal state. The first delivery pipeline (210) is supported by the first bracket (211). The first delivery pipeline (210) is equipped with a first pressure gauge (212), a first drain valve (213), and a first shut-off valve (214). The second delivery pipeline (220) is in an inclined climbing state. The second delivery pipeline (220) is supported by the second bracket (221). The second delivery pipeline (220) is equipped with a second pressure gauge (222), a second drain valve (223), and a second shut-off valve (224). The third delivery pipeline (230) is in an inclined downward state. The third delivery pipeline (230) is supported by the third bracket (231). The third delivery pipeline (230) is equipped with a third pressure gauge (232), a third drain valve (233), and a third shut-off valve (234). The fourth delivery pipeline (240) is in a vertical state, and a fourth pressure gauge (241) is installed on the fourth delivery pipeline (240). The fifth delivery pipeline (250) is supported by the fifth bracket (251), and a fifth pressure gauge (252) is installed on the fifth delivery pipeline (250).

6. The compressed air foam pipeline transportation experimental system according to claim 5, characterized in that, The first bracket (211), the second bracket (221), the third bracket (231), and the fifth bracket (251) are all height-adjustable brackets, and the first bracket (211), the second bracket (221), the third bracket (231), and the fifth bracket (251) are all fixed to the corresponding delivery pipeline by clamps, and the clamps are adjustable clamps.

7. The compressed air foam pipeline transportation experimental system according to claim 5, characterized in that, The liquid collection unit includes: A liquid collection tank (340) is located at the output end of the fifth delivery pipeline (250) and is used to collect compressed air foam ejected by the fire sprinkler head (253). The first liquid receiving vessel (310) is located at the corresponding position of the first drain valve (213) and is used to collect compressed air foam in the first delivery pipeline (210); The second liquid receiving vessel (320) is located at the corresponding position of the second drain valve (223) and is used to collect compressed air foam in the second delivery pipeline (220); The third liquid receiving vessel (330) is located at the corresponding position of the third drain valve (233) and is used to collect compressed air foam in the third delivery pipeline (230).

8. The compressed air foam pipeline transportation experimental system according to claim 1, characterized in that, The control unit includes an operation module (610) and a main control module (620) connected in communication. The microscopic property testing unit includes a microscope (410), which is communicatively connected to the main control module (620).

9. The compressed air foam pipeline transportation experimental system according to claim 8, characterized in that, The liquid analysis characteristic testing unit includes a sand core funnel (510), a beaker (520), an iron stand (530), and a high-precision electronic balance (540). The high-precision electronic balance (540) is communicatively connected to the main control module (620).

10. The compressed air foam pipeline delivery experimental system according to any one of claims 1-9, characterized in that, The compressed air foam provided by the supply unit has a gas-liquid ratio of 5-20.

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